Dr Philip Hurst, Canterbury Christ Church University, @Phil_Hurst1
In this blog I aim to provide a short summary of the placebo
effect and its potential to be used a tool to prevent drug use in sport. A
brief introduction of the placebo effect on sport performance is provided and
the implications this research can have for sport practitioners is discussed.
What is the placebo effect?
Over the
past 50 years, research in sport and exercise science has shown the significant
impact the placebo effect can have on sport performance. Linked to psychoneurobiological
changes, placebo effects often result from the expectation or belief that an
intervention will improve performance (Hurst, Foad,
Coleman, & Beedie, 2017a). Typically, research in sport and
exercise science investigates the placebo effect of performance enhancing
substances (Beedie et al.,
2018; Beedie & Foad, 2009), such as anabolic steroids (Maganaris,
Collins, & Sharp, 2000), caffeine (Beedie, Stuart,
Coleman, & Foad, 2006) and sodium bicarbonate (McClung &
Collins, 2007). Collectively, this research
suggest that the belief that a substance has been received can improve sport
performance by up to 5% (Beedie &
Foad, 2009).
Could you use a placebo in practice?
Given the
significant impact placebo effects can have on sport performance, it is
understandable for practitioners to consider using the placebo effect to
improve their athletes’ performance (Beedie et al.,
2017). In a survey study of nearly 100
coaches ranging from regional to international level, Szabo and Muller
(2016) found that 44% of the sample
indicated they had used placebos in the attempt to enhance their athletes’
performance, with international level coaches being the most likely to do so. Over
half (58%) of the coaches indicated they would use a placebo again and among
this group, 14% indicated they would do so without the athlete’s consent. The
finding that a majority of coaches use placebos, often without the consent or
knowledge of their athletes, and the willingness of athletes to use a purported
performance enhancer on the advice of the coach describes conditions rife for
the unethical use of the placebo effect in sport.
Implications of the placebo effect in practice
The benevolent and paternalistic use of the placebo effect is arguably contrary to individual autonomy, and if an athlete discovers they have used a placebo when they believed it was a performance enhancing substance, this may negatively affect the trust between the practitioner and athlete. The use of the placebo effect in practice is arguably unethical. However, research has shown that a significant proportion of the effectiveness of a performance enhancing substance, can often be the result of the placebo effect. In light of this, it has been suggested that placebo effect research could be used as a tool to prevent the use of banned performance enhancing substances (i.e. doping).
Could placebos prevent drug use in sport?
If it is
demonstrated to athletes that placebo effects can affect their performance to a
similar degree as performance enhancing substances, it is reasonable to suggest
that athletes with this knowledge may be less likely to dope in the future. As
part of my PhD, I aimed to determine whether knowledge of the placebo effect
could affect athletes’ decision to use performance enhancing substances. Six
hundred and twenty seven athletes were recruited to take part in a placebo
effect experiment. After completing measures of intention to use and attitudes
towards performance enhancing substances, athletes completed baseline 5 x 20-m
sprints. They were then randomised to one of three groups. Group 1 were given a
placebo and told it would improve performance, group 2 were given a placebo and
told it was harmful sport supplement and group 3 were given nothing and told
nothing. Twenty minutes later, athletes ran another 5 x 20-m sprints. After
completing the sprints, athletes in groups 1 and 2 were shown the results of
the sprints (see Hurst et
al., 2017a) and told
that they were not given a sport supplement, but in fact, were given a placebo.
They were told about existing research in this area and that the belief that a
substance has been received can significantly influence their performance.
Group 3 were shown the results of the sprints and not given any information
about the placebo effect. Athletes then completed measures of intention to use
and attitudes towards performance enhancing substances once more. Results
indicated that compared to group 3, athletes in group 1 and 2 were less likely
to use performance enhancing substances in the future and reported less
favourable attitudes towards doping.
The placebo effect and anti-doping
For
practitioners aiming to prevent performance enhancing substance use in sport,
educating athletes about the placebo effect may be beneficial. It has recently
been shown that athletes believing sport supplements are effective, are more
likely to dope (Hurst, Foad,
Coleman, & Beedie, 2017b; Hurst, Kavussanu, Boardley, & Ring, 2019), and that athletes who intend to use
supplements are more likely to respond to a placebo (Hurst et al.,
2017a). It is therefore
reasonable to suggest that educating athletes about the placebo effect might
help athletes make more informed decisions about the use of performance
enhancing substances and reduce the risk of athletes doping. Sport
organisations, such as UK Anti-doping and the World Anti-Doping Agency, could
include material in their anti-doping education programmes about the placebo
effect to help mitigate an athletes likelihood of using potentially harmful performance
enhancing substances.
Reference list
Beedie, C., Benedetti, F., Barbiani, D., Camerone, E., Cohen, E.,
Coleman, D., . . . Szabo, A. (2018). Consensus statement on placebo effects in
sports and exercise: the need for conceptual clarity, methodological rigour,
and the elucidation of neurobiological mechanisms. European Journal of Sport Science, 18(10), 1383-1389.
doi:10.1080/17461391.2018.1496144
Beedie, C., & Foad, A. J. (2009). The placebo effect in sports
performance: a brief review. Sports
Medicine, 39(4), 313-329. doi:10.2165/00007256-200939040-00004
Beedie, C., Stuart, E. M., Coleman, D. A., & Foad, A. J. (2006).
Placebo effects of caffeine on cycling performance. Medicine and Science in Sports and Exercise, 38(12), 2159-2164.
doi:10.1249/01.mss.0000233805.56315.a9
Beedie, C., Whyte, G., Lane, A. M., Cohen, E., Raglin, J., Hurst,
P., . . . Foad, A. (2017). ‘Caution, this treatment is a placebo. It might
work, but it might not’: why emerging mechanistic evidence for placebo effects
does not legitimise complementary and alternative medicines in sport. In: BMJ
Publishing Group Ltd and British Association of Sport and Exercise Medicine.
Hurst, P., Foad, A. J., Coleman, D. A., & Beedie, C. (2017a).
Athletes Intending to Use Sports Supplements Are More Likely to Respond to a
Placebo. Medicine and Science in Sports
and Exercise, 40(9), 1877-1883. doi:10.1249/MSS.0000000000001297.
Hurst, P., Foad, A. J., Coleman, D. A., & Beedie, C. (2017b). Development and validation of the Sports Supplements Beliefs Scale. Performance Enhancement & Health, 5(3), 89-97. doi:10.1016/j.peh.2016.10.001
Hurst, P., Kavussanu, M., Boardley, I. D., & Ring, C. (2019).
Sport supplement us predicts doping via sport supplement beliefs. Journal of Sports Sciences, 1-7.
doi:10.1080/02640414.2019.1589920
Maganaris, C. N., Collins, D., & Sharp, M. (2000). Expectancy
effects and strength training: do steroids make a difference? The Sport Psychologist, 14(3), 272-278.
McClung, M., & Collins, D. (2007). “Because I know it will!”:
placebo effects of an ergogenic aid on athletic performance. Journal of Sport and Exercise Psychology, 29(3),
382-394.
Szabo, A., & Muller, A. (2016). Coaches’ attitudes towards
placebo interventions in sport. Eur J
Sport Sci, 16(3), 293-300. doi:10.1080/17461391.2015.1019572