One of the biggest discussions with coaches I have had during my coaching years had regularly been about how to maximise learning we can not have athletes who are fatigued. The main conversation was always around work-to-rest periods when trying to teach drills or new movement patterns to athletes, or around the problem with always trying to do skill based sessions when athletes are fatigued. For example, it used to be quite commonplace at GB Taekwondo that, following a morning session, athletes would do an individual with their coach to try and focus on their own individual development. The challenge with this is that most coaches agree that fatigue makes performance worse in the moment, but does it actually affect learning? Also, is there any argument to this idea of developing skills when fatigued? Well I believe that a paper by Branscheidt et al. (2019) really sheds some light in this area. The Study: Branscheidt M, Kassavetis P, Anaya M, et al. (2019) Title: Fatigue induces long-lasting detrimental changes in motor-skill learning The Aim The researchers wanted to answer one question: Does fatigue simply reduce performance while you're tired, or does it actually reduce long-term motor learning? These are two very different things. In motor learning we distinguish between: - Performance = How well you perform today. - Learning = A relatively permanent improvement that remains after recovery. Participants The main experiment included: - 38 healthy adults - 20 participants in the fatigue group - 18 participants in the control group All participants learned the same novel motor skill. The Task Rather than using a sporting movement, participants completed a highly controlled laboratory task. Using a force sensor held between the thumb and index finger, they had to: - produce a precise amount of force, - move a cursor through a sequence of targets, - while being both fast and accurate. The researchers combined speed and accuracy into a single skill score, allowing them to measure genuine improvements in motor skill rather than simply moving faster or making fewer errors.

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