ABSTRACT
Numerous studies have established that there is a circadian rhythm in muscle strength in males, measured in both isometric and dynamic conditions and in many muscle groups. Diurnal rhythms have also been apparent in neuromotor performance, and gross motor function when limited measurements per day have been conducted (Reilly, 1990). Isokinetic muscle strength consistently peaks in the early evening, regardless of the muscle groups tested or the speed of contraction (Atkinson and Reilly, 1996). The circadian rhythm in muscle strength has been shown to be in phase with that of core body temperature (Reilly et al., 1997).
