Pseudoscience Persists in Elite Football Performance Practices

Performance director Claire-Marie Roberts—formerly of Coventry City and the Premier League, now at McLaren’s human-performance division—explains that elite football clubs routinely adopt devices and regimes lacking solid scientific backing. She recounts a sales pitch offering “oxygen in a can” to players, which she dismissed as “only 21%” oxygen, a fact taught at the GCSE level.

The Guardian

Roberts has spent decades optimizing athletes, including nine years in the Premier League and two guiding Coventry City to Championship promotion. In her current role she observes a widening “science-practice gap,” where coaches and staff are drawn to “sparkly marketing” and shortcuts promising performance gains.

The Guardian

• “Most clubs have got cryotherapy chambers – most people cannot articulate to you why they use them, because there’s no evidence for them apart from a very slim piece of work that says it might help prevent dementia.”

The Guardian

• It offers only a placebo-type proprioceptive cue.

The Guardian

• Supplement overload: The multibillion-pound supplement market infiltrates clubs, yet Roberts stresses that only vitamin D (addressing common northern-hemisphere deficiencies) and vitamin C have clear, evidence-based roles. Other products are often taken “passively” without targeted need.

The Guardian

Roberts argues that reliance on unproven methods diverts resources from proven fundamentals—adequate sleep, nutrition, and high-quality training. She warns that “they’re taking a population that is very susceptible to: ‘How can I hack my performance advantage? How can I shortcut my preparation and recovery?’ Which I don’t think is a great starting point.”

The Guardian

“It’s the science-practice gap, which is widening in my experience.”

The Guardian

• “Right … oxygen in a can,”

The Guardian

• “It’s the science-practice gap, which is widening in my experience,”

The Guardian

• “Most clubs have got cryotherapy chambers – most people cannot articulate to you why they use them, because there’s no evidence for them apart from a very slim piece of work that says it might help prevent dementia,”

The Guardian

• “Because England or Manchester City or Chelsea who have all the resources under the sun have got this, there’s a misappropriation of confidence and understanding of the scientific basis or evidence. It’s powerful in driving behaviour, but it’s driving the wrong behaviour.”

The Guardian

Roberts concludes that without a systematic shift toward evidence-based decision-making and the employment of qualified scientific staff, football’s “anti-intellectual” culture will likely intensify, perpetuating reliance on gimmicks rather than rigorously tested performance strategies.

The Guardian