According to an aspect, there is provided a computer-implemented method for assessing muscle fatigue in at least one muscle of a subject. The method comprises (i) obtaining a first set of measurements of muscle contractions of the at least one muscle for a first time period； (ii) forming a first frequency distribution from values of a muscle contraction feature determined from the first set of measurements； (iii) determining a first distribution fit of the first frequency distribution； (iv) determining whether the first distribution fit is statistically stable； (v) if the first distribution fit is determined to be statistically stable, determining, from the first distribution fit, a first value for a distribution fit feature； (vi) comparing the first value to a second value for the distribution fit feature to determine a measure of the fatigue of the at least one muscle during the first time period, wherein the second value for the distribution fit feature relates to a second distribution fit of a second frequency distribution, wherein the second frequency distribution is formed from values of the muscle contraction feature determined from a second set of measurements of muscle contractions of the at least one muscle for a second time period that is different to the first time period； and (vii) outputting a signal representing the determined measure of the fatigue.
