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- Is this case study continued from a case study submitted in 2014?
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1. Summary of the impact
Doping violates the spirit of sports and is potentially damaging to both the careers and health of athletes, yet it persists. Indeed, the prevalence of the use of performance enhancing drugs in sport is a dynamic challenge that is continuously evolving. The King’s College London Drug Control Centre (DCC) is at the forefront of introducing advances in anti-doping science, contributing to both research and providing state-of-the-art laboratory services to both national and international anti-doping agencies. The DCC has developed unique research and analytical improvements to laboratory methods which have led to a strengthening in the UK’s anti-doping programme. Research has been integrated into the practice and policy of the World Anti-Doping Agency and has been used successfully to support anti-doping efforts at international competitions and major games around the world. In addition, DCC research has been integral to high profile international anti-doping investigations such as the 2016 McLaren report, which identified numerous anti-doping violations in Russia.
2. Underpinning research
As doping agents evolve and new ways of cheating develop, the requirement to monitor banned substances and maintain analytical competency in sport drug testing means anti-doping is a continuous challenge for scientists. Researchers at the King’s College London DCC have undertaken investigations targeted at increasing the understanding and detection of the compounds misused by athletes. The approach has been to detect an ever-greater number of prohibited substances at low concentrations in biological fluids, whilst enhancing testing capability, increasing the quality of analytical data, its sensitivity, and its evidential quality. New knowledge in enhancing the fight against doping in sport as a result of the research from the DCC is outlined in the two examples below.
i. Improving the detection of Human Growth Hormone (hGH)
hGH is a naturally occurring peptide hormone also available for medicinal purposes in a recombinant form (rhGH). Its attraction as a doping agent in sport, includes the reduction of body fat, a potential increase in muscle mass and strength (anabolic effect), and tissue-repairing effects (recovery and increased collagen synthesis). However, distinguishing natural hGH from the recombinant forms and marked inter-individual variability makes detection of doping extremely difficult. Initial work saw King’s researchers use acetonitrile protein depletion with a 5 min ultra‐high‐performance liquid chromatography/tandem mass spectrometry (UHPLC/MS/MS)‐based selected reaction monitoring (SRM) assay to detect both insulin-like growth factor I (IGF‐I) and leucine‐rich α‐2‐glycoprotein (LRG) at endogenous concentrations in human serum as a viable means of protein quantification in sports competitors [1]. The DCC scientists, in collaboration with endocrinologists at the University of Southampton, then worked to improve the detection of hGH administration by athletes using a biomarker approach: an indirect method to target biomarkers related to hGH that remain in the body for longer [2,3]. King’s researchers successfully advanced the development of methods for the detection of IGF-I and the pro-collagen type III N-terminal peptide (P-III-NP) [2,4]. Since 2015, this collaborative research has improved the test through the introduction of robust and validated decision limits based on the “GH score” (calculated using the IGF-I and P-III-NP concentrations). These limits are now applied to samples from athletes for the detection of hGH administration, offering a more sensitive analytical approach [5] and have been approved for use by the World Anti-Doping Agency (WADA).
The detection and quantification of proteins, in particular of peptide hormones in urine, has continued to pose analytical challenges in sports testing. Historically, testing has relied on the measurement of relevant biomarkers using immunoassay tests, which have been associated with varied performance, poor correlation among methods and differential cross-reactivity. King’s researchers developed a superior approach for the analysis of IGF-I and P-III-NP peptides with improved sensitivity and evidential quality [6]. They were able to differentiate between exogenous (illicit) peptides and those found endogenously in the body by pioneering the use of tryptic digestion and subsequent micro/nano-liquid chromatography-mass spectrometry (LC-MS), with two surrogate tryptic peptides (hT1 and T5) for the mass spectrometric confirmation of P-III-NP. This facilitated the detection of P-III-NP in a human serum sample by LC-MS for the first time [6]. This research has been recognised by awards such as the Barber prize for Mass Spectrometry (British Mass Spectrometry Society, 2017) and best article (Partnership for Clean Competition Funded Research, 2018).
ii. Developing novel anti-doping methods to identify illegal sample manipulation
Ensuring the integrity of the biological samples provided by athletes is critical to the anti-doping system. Athletes seeking to subvert the system may try to manipulate their sample in such a way that the subsequent analytical results are less likely to demonstrate that they have been taking a prohibited substance. An example of this behaviour is providing an alternative “clean urine” sample from themselves or a colleague which can negatively affect the analytical data. To solve this problem the DCC developed sensitive and rapid methods to detect and profile DNA within an athlete’s urine [7]. This meant that it was now possible to verify that the correct athlete provided the sample.
3. References to the research
Kay RG, Barton C, Velloso CP, Brown PR, Bartlett C, Blazevich AJ, Godfrey RJ, Goldspink G, Rees R, Ball GR, Cowan DA, Harridge SDR, Roberts J, Teale P, Creaser CS (2009). High-throughput ultra-high-performance liquid chromatography/ tandem mass spectrometry quantitation of insulin-like growth factor-I and leucine-rich a-2-glycoprotein in serum as biomarkers of recombinant human growth hormone administration. Rapid Communications in Mass Spectrometry; 23: 3173–3182. DOI: 10.1002/rcm.4237.
Velloso C, Godfrey R, Blazevich A, Bartlett C, Cowan DA, Bouloux PM, Harridge SDR, Goldspink G (2013). The effects of two weeks recombinant growth hormone administration on the response of IGF-I and PIIIP to a single bout of high resistance exercise in resistance trained young men. Growth Hormone & IGF-I Research 23:76-80. DOI: 10.1016/j.ghir.2013.01.002
Lopes F, Cowan DA, Thevis M, Thomas A, Parkin MC (2014). Quantification of intact human insulin-like growth factor-I in serum by nano-ultrahigh-performance liquid chromatography/ tandem mass spectrometry. Rapid Communications in Mass Spectrometry. 15;28(13):1426-32. DOI: 10.1002/rcm.6908.
Guha N, Erotokritou-Mulligan I, Bartlett C, Nevitt SP, Francis M, Bassett EE, Cowan DA, Sönksen PH, Holt RI (2014). Biochemical markers of insulin-like growth factor-I misuse in athletes: the response of serum IGF-I, procollagen type III amino-terminal propeptide, and the GH-2000 score to the administration of rhIGF-I/rhIGF binding protein-3 complex. The Journal of Clinical Endocrinology and Metabolism. 99(6):2259-68. DOI: 10.1210/jc.2013-3897.
Holt RI, Böhning W, Guha N, Bartlett C, Cowan DA, Giraud S, Bassett EE, Sönksen PH, Böhning D (2015). The development of decision limits for the GH-2000 detection methodology using additional insulin-like growth factor-I and amino-terminal pro-peptide of type III collagen assays. Drug Testing Analysis. 7(9):745-55. DOI: 10.1002/dta.1772.
Moncrieffe D, Parkin MC, Cowan DA (2018). Peptide selection for the quantification of P-III-NP in human serum by mass spectrometry. Rapid Communications in Mass Spectrometry 15;32(7):535-542. DOI:10.1002/rcm.8066.
Devesse L, Syndercombe Court D, Cowan DA (2015). Determining the authenticity of athlete urine in doping control by DNA analysis. Drug Testing Analysis. 7(10):912-918. DOI: 10.1002/dta.1785.
4. Details of the impact
The King’s College London DCC seeks to protect both the integrity of sport and the health of athletes and is the only WADA accredited laboratory in the UK. The DCC aims to increase awareness of the danger of doping for the health of those participating in sport at any level and keep up with the multifaceted technical nature of cheating in sport to ensure that the UK remains at the forefront of the fight against doping. The DCC has collaborated with key actors in the anti-doping world, ensuring that cutting edge science remains effectively employed in practice and policy.
Shaping world class testing
As the only testing centre accredited by WADA in the UK, the DCC has, since 1978, provided robust and trusted analytical services. Due to the high quality of work and their impact on standing in the anti-doping community, the total number of samples collected and analysed by the DCC continues to rise year on year. In 2015, the DCC analysed 8,800 samples, whilst in 2018 this number had increased to 12,587 samples, demonstrating that professional sports bodies are increasingly acknowledging the importance of testing athletes as a deterrent to the use of performance enhancing drugs. Using the accredited laboratories at King’s as an advanced and trusted testing site, DCC research has impacted the shape and trajectory of testing in the UK.
King’s researchers have a proven track record in hGH research [2,3,4]. Working closely with WADA the DCC team developed a new methodological approach to test for hGH, the Human Growth Hormone (hGH) Biomarkers Test. This test was incorporated into guidelines published by WADA in 2015 for all anti-doping laboratories through across the world [A]. These guidelines provide the regulatory documents, implementation processes and monitoring procedures to ensure that tests are carried out systematically and that a harmonised approach is taken across all test centres. As the Senior Deputy Director of the Science and Medicine department at WADA acknowledges, “the research output of the DCC was pivotal in the establishment of legally defensible biomarker scores and the implementation of the WADA Guidelines - Human Growth Hormone (hGH) Biomarkers Test in 2015” [B]. [text removed for publication]
Appropriate long-term storage and further analysis of archived samples collected from athletes has emerged as an important factor in the protection of clean sport. Under the World Anti-Doping Code, samples can be stored for up to 10 years after their initial analysis and still retain the same legal impact if analysed further retrospectively. Taking advantage of DCC research to improve techniques and detect novel compounds, King’s researchers have been able to conduct enhanced retrospective analysis on over 100 samples, with more planned.
Shaping practice and policy in UK anti-doping (UKAD)
UKAD, as the organisation responsible for protecting sport in the UK from doping, works towards ‘protecting the right to participate in clean sport’. The DCC is the predominant laboratory used by UKAD for the analysis of athlete samples with the aim of catching those in sport who cheat.
In 2018, the Department for Digital, Culture, Media and Sport published a ‘Tailored Review of UKAD’ [D] which contained an assessment of current services along with 45 recommendations for the future. The report highlighted the close partnership between the UKAD and the DCC, stating the King’s centre as the “most impressive example and contributes to the UK’s international standing in sport and anti-doping” [D]. The report recommended a 50% increase in testing across sport, and in January 2018, the UK Government gave UK anti-doping a £6 million funding boost to educate athletes, share intelligence and conduct testing in the fight against drug cheats to keep sport clean [E]. As a result, the number of samples analysed by the DCC has increased to nearly 13,000 in 2019. [text removed for publication].
Shaping antidoping testing at key events
The DCC has provided the analytical science to ensure that high class anti-doping is provided at the world’s premier sporting events to maintain fairness and safety. After successfully supporting testing at the London 2012 Olympic Games the DCC team have gone on to support the development of policy, practice and process in a variety of settings.
For example, King’s research has ensured that major games now use techniques from mass spectrometry, detecting peptide and growth hormones more effectively. Former director of the Brazilian Doping Control Laboratory noted that “the breakthrough of growth hormone exogenous administration detection for the first time in 2012, showed the athletic community that the era of protein doping was due to be over” [G]. As a result, more compounds were tested at the 2016 Rio Games than any other previous games ensuring that the health of the athletes and tests conducted are of the highest ethical standard, giving confidence to individual athletes that major competitions are as fair as possible.
By providing communication skills, laboratory organisation, procurement processes, training of personnel and volunteers, researcher exchanges and advanced training the DCC significantly impacted on the preparations and processes during the Games. As the former director of the Brazilian Doping Control Laboratory stated “this sizeable contribution of Professor Cowan, the DCC and King´s College London surely had an impact on the quality of the doping control analysis performed at the Rio 2016 games” [G]. The Independent observer for the Rio 2016 Olympic Laboratory report stated “the laboratory was superbly equipped, operated very securely and generally very efficiently, and now represents an outstanding legacy from the Games for the anti-doping movement in South America” [M].
In addition, the King’s team impacted on the preparations for the PyeongChang Winter Olympic Games 2018. As stated by the former head of the South Korean WADA laboratory at the Korea Institute of Science and Technology in Seoul, the DCC were “key in helping us to fulfil our work to the international standard required… for the preparation of 2018 Games, I have made the contract with [DCC] for solution of WADA ISL requirements in staff, facility, security and scientific methods. They were involved in training our staffs, designing document systems for traceability of overall process of sample analysis, preparing WADA site visits, and defending WADA reports requested after the result of the site visit… [the DCC] was the best supporter to us in advising and suggesting the technical solutions of the sample analysis for its successful achievement” [H].
Investigating doping violations - Russia
Following a 2014 German TV documentary which contained allegations of widespread doping in Russia, WADA established an Independent Commission (IC) to conduct an investigation into the allegedly corrupt practices around sample collection and results management that implicated athletes, coaches, trainers, and doctors, as well as the accredited laboratory based in Moscow and the Russian Anti-Doping Agency (RUSADA) in doping violations. As one of the most important events in the world-wide anti-doping community for many years, the WADA President appointed Professor Richard McLaren to lead the IC, with findings reported in 2015 and 2016 [I].
King’s researchers contributed significantly to the IC, utilising new research and techniques to provide validated methodologies which could detect sample manipulation with salt [J], and urine swapping through DNA analysis [7]. Prof McLaren turned to the DCC since they either “had in their repertoire of analytical methods or rapidly developed methods that provided me with legally defensible evidence that samples had been manipulated as claimed by Dr Rodchenkov. This greatly assisted me in proving the involvement of individuals who could then be identified in my formal and public reports” [K].
The IC ultimately proved systematic cheating and a universal ban was placed on Russian athletes participating in worldwide sporting events such as Rio 2016 Olympics and Paralympics [L] as well as the WADA accreditation of the Moscow Laboratory being revoked. As noted by Prof McLaren “Without the assistance of the Drug Control Centre, my investigation would at best have been delayed and possibly may not have been able to reach the clear conclusions as published… I am very indebted to the DCC for the very significant contributions they made to my work” [K].
These events had a huge impact on international sport, demonstrating to the world that the fight against doping is being taken incredibly seriously, and those who seek to subvert the system, no matter how powerful, will be heavily sanctioned. As a result, large organisations such as WADA and the International Olympic Committee have reiterated their critical commitment to the maintenance of fairness in competition, where King’s researchers continue to play a key role.
5. Sources to corroborate the impact
WADA World Anti-Doping Program (April 2016) Guidelines: Human Growth Hormone (hGH) Biomarkers Test for Doping Control Analyses Version 2.0
Testimonial from Senior Deputy Director Science, Laboratories, World Anti-Doping Agency
[text removed for publication]
Department for Digital, Culture, Media & Sport (Jan 2018) Tailored Review of UK Anti-Doping
Gov.uk (Jan 2018) UK Anti-Doping receives £6 million funding boost [press release]
[text removed for publication]
Testimonial from Director of the Laboratory for the Support of Technological Development Chemistry Institute Federal University of Rio de Janeiro
Testimonial from former head of the South Korean WADA laboratory, Korea University Science & Technology, Korea Institute of Science and Technology
World Anti-Doping Independent Commission Investigation (Nov 2015) The Independent Commission Report #1: Final Report and (Jan 2016) The Independent Commission Report #2
Angeli Mehta (2016) Anti-doping scientists expose cheating Russian athletes, ChemistryWorld.com
Testimonial from Professor Richard McLaren, O.C., DD, Faculty of Law, Western University, London, Canada, CEO, McLaren Global Sport Solutions Inc.
Olympic.org (July 2016) Decision of the IOC Executive Board Concerning the Participation of Russian Athletes in the Olympic Games Rio 2016 [news article]
World Anti-Doping Agency (2016) Report of the Independent Observers Games of the XXXI Olympiad, Rio de Janeiro 2016
- Submitting institution
- King's College London
- Unit of assessment
- 24 - Sport and Exercise Sciences, Leisure and Tourism
- Summary impact type
- Societal
- Is this case study continued from a case study submitted in 2014?
- No
1. Summary of the impact
Fast-jet pilots can experience incredible acceleration (G) forces, posing risks of career-impacting and life-affecting neck injury, or even death, due to aircraft crash owing to G-induced loss of consciousness (G-LOC). King’s College London researchers, in close partnership with the Royal Air Force (RAF) Centre of Aviation Medicine, have designed and developed a new Aircrew Conditioning Programme (ACP) to reduce fatigue, improve G-tolerance and reduce neck injury. The ACP is now mandated as part of the RAF Aircrew Training Pathway, has been taken up by other branches of the UK military and by other international air forces, and has been key in shaping recommendations of the NATO Research Task Group on Aircrew Neck Pain.
2. Underpinning research
Prevalence & Risk of G-Induced Loss of Consciousness
Fast-jet pilots routinely experience extremely high G-forces, particularly in the head to feet direction (+G z). This physically demanding environment can result in fatigue, neck injury and, even more concerning, loss of consciousness (G-LOC). G-LOC usually manifests as a period of complete motor and cognitive impairment followed by relative incapacitation, which can cause a significant occupational hazard to aircrew. It has resulted in catastrophic consequences, including aircrew death and loss of aircraft.
In the early 2000s a survey was conducted by the RAF to identify the extent of G-LOC in 2259 UK military aircrew, the results of which led to the UK Ministry of Defence (MOD) mandating human centrifuge training for all fast-jet aircrew to optimise their anti-G straining manoeuvre (AGSM) and improve their protection against +Gz. To identify whether the introduction of centrifuge training reduced the incidence of G-LOC, along with views on current practices to prevent G-LOC, researchers at King’s College London’s Centre for Human & Applied Physiological Sciences, in partnership with the RAF Centre of Aviation Medicine (RAF CAM), conducted a new anonymous survey of all RAF aircrew [1]. Research identified that 15% of respondents had experienced G-LOC and that it was particularly prevalent during the initial phases of flight training. In addition, ~70% had experienced neck injury at some point during their career.
In parallel, the research team also identified the cardiovascular challenges experienced by aircrew during repeated G z exposures [2] and showed that current RAF anti-G systems did not fully protect aircrew against the highest levels of G [3]. This, taken with the high incidence of G-LOC being reported by aircrew, despite the introduction of mandatory centrifuge training, emphasised the need to develop further interventions targeted at reducing the risks of G-LOC associated with exposure to high G forces in fast-jet pilots.
Development of Interventions: The Aircrew Conditioning Programme
With the introduction of technically more advanced aircraft such as the Eurofighter Typhoon and F35B-Lightning, aircrew can be exposed to high and sustained levels of G z, and thus the threat of long-term injury and G-LOC remains significant. Aircrew themselves have also recognised that the performance of the AGSM can become very fatiguing, thereby lowering its effectiveness over time, and possibly reducing overall flying performance. These considerations, along with the research conducted in partnership with the RAF CAM, led to the recommendation that a structured physical conditioning programme be designed to increase the general strength of muscle groups involved in the AGSM.
To address this, we designed an innovative and novel Aircrew Conditioning Programme (ACP) to target the specific needs of aircrew [4]. It was well known that appropriate physical conditioning can reduce or delay the development of fatigue, improve the strength of the muscles supporting the head and neck, and would thus help reduce the risk of neck injury resulting from acceleration exposure. However, the potential effect of any conditioning programme on G-tolerance was less clear, with it being previously suggested that it could either improve, or indeed worsen, G-tolerance depending on the type of exercises performed. Therefore, the ACP went through a rigorous validation phase where its content was assessed by six international aviation medicine experts to ensure that: i) it was highly relevant to aircrew and ii) would be unlikely to adversely impact aircrew performance/G-tolerance [4]. This led to the ACP being a structured and progressive exercise programme that targets improvements in strength, aerobic fitness and flexibility as well as the stability/motor control of the neck and upper torso [4]. Having aircrew complete the ACP would improve their ability to repeatedly perform an effective AGSM and reduce strain injuries to the neck, thus helping enhance overall aircrew performance.
Testing the ACP
While the theoretical underpinning of the ACP had been validated, its practical application still required investigating. A 12-week controlled trial was therefore conducted to evaluate the effect of the ACP on different aspects of G-tolerance in 36 serving RAF and Royal Navy (RN) aircrew [5]. The participants in the study underwent testing on a human-rated centrifuge before and after 12 weeks of either the new ACP or continuing their routine military training. A series of centrifuge assessments were conducted to determine whether the physiological response to acceleration exposure was altered, as well as the effects on relaxed G-tolerance. This study revealed that the ACP could reduce the physiological strain associated with the AGSM, indicating a positive impact on G-tolerance, and that it could delay the onset of fatigue development. Importantly, it also demonstrated that the ACP did not detrimentally affect G-tolerance. This study thus demonstrated that the ACP could be an effective means of enhancing G-tolerance and reduce the risk of G-LOC in the fast-jet pilot community. The improvements it has made to the strength of the muscles supporting the head and neck will also be beneficial in reducing the incidence of neck pain in aircrew. This is the first structured ACP to have been developed specifically targeted at optimising the performance of fast-jet pilots and has subsequently become a world-leading example, influencing practice globally.
3. References to the research
Slungaard E, McLeod J, Green NDC, Kiran A, Newham DJ, Harridge SDR (2017) Incidence of G-Induced Loss of Consciousness and Almost Loss of Consciousness in the Royal Air Force. Aerospace Medicine and Human Performance. 88(6):550-555. DOI:10.3357/AMHP.4752.2017
Stevenson AT, Scott JPR, Chiesa S, Sin D, Coates G, Bagshaw M, Harridge SDR (2014) Blood pressure, vascular resistance, and +Gz tolerance, during repeated +Gz exposures. Aviation Space and Environmental Medicine 85: 536-442. DOI: 10.3357/ASEM.3816.2014
Pollock RD, Firth RV, Storey JA, Phillips KE, Connolly DM, Green NDC, Stevenson AT (2019) Hemodynamic Responses and G Protection Afforded by Three Different Anti-G Systems. Aerospace Medicine and Human Performance 90 (11): 925–933. DOI:10.3357/AMHP.4927.2019
Slungaard E, Green NDC, Newham DJ, Harridge SDR (2018) Content Validity of Level Two of the Royal Air Force Aircrew Conditioning Programme. Aerospace Medicine and Human Performance. 89(10):896-904. DOI:10.3357/AMHP.4994.2018
Slungaard E, Pollock RD, Stevenson AT, Green NDC, Newham DJ, Harridge SDR (2019) The impact of an Aircrew Conditioning Programme on +Gz tolerance. Aerospace Medicine and Human Performance. 90(9):764-773 DOI: 10.3357/AMHP.5318.2019
4. Details of the impact
The “research conducted as a partnership between the Centre of Human & Applied Physiological Sciences at King’s College London and the Royal Air Force Centre of Aviation Medicine has had direct, significant and lasting impact on military aircrew worldwide” [A].
Prior to this research and despite the acknowledgement that G protection is an important component of fast-jet pilot safety, it needed a significant and tragic event to give the issue more prominence. This was, sadly, provided by the Bournemouth Red Arrows crash of XX-179 in 2011, when one of the RAF’s most experienced high-G pilots from their world-renowned display team was overcome by the effects of G and fatally crashed his aircraft. The subsequent Service Inquiry highlighted concerns around the physical state of the pilot at the time of the incident and how this might have contributed to his susceptibility to G. The fatal crash occurred at the end of a flight and one concern raised was whether physical fatigue may have played a contributing part. At the time, there was conflicting information in the scientific literature around whether physical conditioning may enhance, or worsen, an individual’s G-tolerance. Therefore, there was uncertainty about whether someone should undertake physical training and, if so, what type of training they should undertake to address this concern. The Service Inquiry also raised numerous questions around the cultural and organisational approach to the effects of G and precipitated a root-and-branch change to how it was considered and prioritised. Our research in response to this has “changed UK Defence aviation medicine policy, such that the ACP is now a mandated component of the aircrew training pipeline” [A].
Tackling G-LOC and reducing neck injury in the RAF – creating a new training programme
To begin to tackle these problems, King’s researchers were called upon by the RAF to facilitate a repeat of the G-LOC survey outlined above [1]. This second survey demonstrated important new information to the RAF, showing that G-LOC was occurring in pilots during elementary flying training (EFT) (i.e. before they are selected for fast-jet training) and, critically, before they receive any G training [B]. The G-LOC survey was, therefore, a key piece of evidence in convincing the RAF that another layer of G training needed to be introduced early in EFT to address this previously unrecognised risk. The G-LOC survey also served as an important piece of evidence in the justification for significant investment (~£44 million) in a new human-carrying centrifuge [C] which was opened at RAF Cranwell in 2018. The RAF Centre of Aviation Medicine (RAF CAM) have said that “the weight of evidence supported both a new national capability for high G training and a requirement for a bespoke and evidence-based physical conditioning programme” [A].
In addition, the research programme around the Aircrew Conditioning Programme (ACP) [1,4,5] was not only formulated to address research gaps, but to address the issue of the significant morbidity associated with musculoskeletal injury in fast-jet aircrew populations, and in particular neck injury. As such, an important part of the ACP is to provide a conditioning programme that incorporated targeted approaches to tackling musculoskeletal injury. RAF CAM report that the ACP “delivered immediate gain through the management of fatigue when under G” [A].
As described above one of the main findings of our research was the high incidence of G-LOC in aircrew during the very early phases of flight training. The relevance of this finding and its implications have gained greater prominence due to the introduction of a new higher performance EFT aircraft. During EFT, pilots previously would fly the Grob Tutor. However, during the period of our research, the RAF transitioned to using the Grob Prefect as their primary training aircraft. The Grob Prefect can sustain significantly higher levels of G and does not include an anti-G protection system. The RAF recognised that there was now going to be an even greater risk of G-LOC with the use of this new aircraft during EFT, magnifying the findings of our G-LOC survey and reinforcing the importance of the introduction of centrifuge training for EFT pilots.
Prior to the research described above, a structured conditioning programme did not exist for any aircrew within the RAF. Despite increasing awareness of aircrew around the importance of physical conditioning in preventing G-LOC, as evidenced in the G-LOC survey [1], participation in regular physical conditioning by aircrew remained low, which the ACP and our research helped to address.
With its strong empirical underpinning and validity, the ACP was introduced as policy by the RAF in 2017 as an integral component of aircrew training (~40 trainee fast-jet aircrew per year) [A]. This is helping to transform the training and awareness associated with the issues surrounding high G forces for fast-jet pilots [A].
All aircrew at each stage of their training now have to meet minimum standards to progress to the next stage of flight training, with centrifuge training and the AGSM being a key component for fast-jet pilots [B,D]. After the ACP became mandatory for fast-jet pilots “the feedback was rapid and positive: the programme was so welcomed by fast-jet aircrew that it was now extended to crews of other manned platforms” [A]. This is supported by reports of fast-jet aircrew having an improved ability to cope with air combat manoeuvring and less neck pain during training due to their participation in the ACP [D]. The physical benefit it has also impacts protective clothing, with anecdotal reports that many aircrew are now having to have their anti-G trousers re-fitted due to the increases in muscle mass as a result of the ACP. Indeed, some are having to have specially tailored trousers as they no longer fit within the 1970s-based anthropometric size role of the skeletal anti-G trousers used in some aircraft.
The Aircrew Conditioning Programme in action – changing national practice
The effectiveness of the ACP for musculoskeletal injury prevention has also been more widely recognised and is now delivered not only to fast-jet pilots, but all aircrew within flying training, regardless of aircraft type. There are currently ~2500 aircrew in the UK military across all aircraft types who will now benefit from ACP throughout their careers.
Since the adoption of the ACP as standard practice by the RAF, other services have also identified the importance of rolling out this kind of training. The ACP has been further developed for different aircrew populations. For example, it has been modified for helicopter aircrew to address different activities that occur in rotary wing, compared to fast-jet, aircrew. This has resulted in the ACP being adopted by the UK Joint Helicopter Command for all Army rotary wing assets and all Royal Navy aviators [A]. In addition, helicopter aircrew have reported less fatigue and pain associated with flying while wearing night-vision goggles, due to the ACP [D]. The ACP is also of particular relevance to the Royal Navy and the success of their new F35B Lightning fast-jet aircraft (costing ~GBP138,000,000 each) now in service on the UK’s two new aircraft carriers - HMS Queen Elizabeth and HMS Prince of Wales.
The ACP has thus become a UK tri-service (RAF, Army and Royal Navy) conditioning programme. This has, in part, been with the aim of reducing the operational and financial burdens on the Ministry of Defence associated with the high prevalence of musculoskeletal injuries in aircrew, while also reducing the serious risk of G-LOC in fast-jet aircrew, and “has a vital role in supporting sovereign capability” [A]. In growing recognition of the ongoing problems with neck pain in aircrew, the NATO HFM-252 Research Task Group on Aircrew Neck Pain was set up in 2014. This was with a remit to identify solutions, develop a report and produce recommendations to reduce aircrew neck pain [E] with its findings disseminated internationally [F]. The ACP was presented to this working group and “is one of the top solutions recommended” [H] as a strategy that should be employed to reduce the risk of neck pain in aircrew [E,F].
Having been designed and tested by physiotherapists and physiologists, the ACP is now delivered through the Physical Education branches of the RAF, Royal Navy and Army and by those who have undergone training in the delivery of the ACP and completed the ACP Instructors Course Competence [D]. This represents a significant investment of resource, especially from the RAF in training physical instructors to deliver the programme, and in terms of aircrew physical training time to undertake the programme. For aircrew, this is both in training and on frontline operational squadrons where they now have protected time in their working week dedicated to following the ACP. This sends important, visible messages about the importance and prioritisation of G and prevention of musculoskeletal injuries in the Military.
In addition to aircrew, the ACP has wider impact in that it is promoted to all RAF personnel through The RAF Total Safety Magazine: AirClues [G]. This has allowed the entirety of the RAF and any civilians who subscribe to the magazine (rather than just the aircrew going through training) to gain an understanding of the importance of the ACP and why it is an essential part of aircrew training and serves to reinforce the needed cultural change.
The Aircrew Conditioning Programme Beyond the UK
In part due to the ACP contributions to the NATO working group and the development of their report, the ACP now has global reach where “its success and value was further evidenced by adoption by other international Armed Forces” [A]. The Naval Air Warfare Center Aircraft Division of the US Navy have stated that the ACP “remains the most validated and data-supported physical conditioning program which has demonstrated effectiveness in military aviators” [H]. After gaining permission from the RAF, the Finnish Air Force, Belgian Armed Forces and Royal Norwegian Air Force have now also begun using the ACP as a standard training programme for their aircrew. Furthermore, the Royal Canadian Air Force [I] and the US Navy [H] are currently evaluating and tailoring the ACP to become standard practice for their aircrew. The Canadian Air Division have said: “the research has influenced the majority of aircrew conditioning programs in existence around the world today and will continue to be the standard to which all other programs are held going forward” [I]. Whilst the “successful implementation of the ACP within the RAF and its roll out to the Royal Navy and Army and the associated publications have proved invaluable in the justification to progress with an ACP pilot study conducted in US Naval aviation and were crucial in garnering senior leader support” [H]. This greatly increases the potential impact of this work by orders of magnitude; the US Navy alone, for example, has almost 10 times the number of fast-jets (1030 in 2017) compared with the RAF (119 in 2019). As noted by the Canadian Air Division “the significance of this work to the scientific and operational communities around the world cannot be understated” [I].
With high-performance training aircraft (such as the Prefect or Hawk T2) and technically more advanced frontline fast-jets (such as the Typhoon, or the more recently introduced F35B-Lightning), aircrew will continue to be exposed to even higher and sustained levels of Gz. Thus, the threat of long-term injury and G-LOC will remain high to the end of Service life of those aircraft, which is currently in the 2040-50 timeframe. In addition, the UK Team Tempest project is currently addressing plans for a 6th Generation high-G fast-jet to enter service in 2035-2040. As such, “this maintains an essential and enduring requirement for the results of this research over many decades to come” [A].
5. Sources to corroborate the impact
Testimonial letter from the Royal Air Force Centre of Aviation Medicine.
Military Aviation Authority Flying (Fly) 2000 Series Regulatory Articles – Issue 20.
Thales Group (2019) A UK Technology First: High G Training and Test Facility [press release]
Royal Air Force (2015) AP3456 The Central Flying School Manual of Flying, Volume 6 – Aviation Medicine
NATO (2020) Aircrew Neck Pain Prevention and Management. Science and Technology Organisation Technical Report. TR-HFM-252
Slungaard E, Day S, Goff C (2019b). UK implementation of recommendations from NATO NFM-252 Research task group report on aircrew neck pain. Aerospace Medicine and Human Performance 90(3):163
Royal Air Force Safety Centre (2018). Aircrew Conditioning Programme. AirClues Issue 27
Testimonial letter from the Department of the US Navy, Naval Air Warfare Center Aircraft Division
Testimonial letter from the Canadian Air Division.