Time-of-day effects on motor unit firing and muscle contractile properties in humans
Tetsuya Hirono, Kaito Igawa, Masamichi Okudaira, Ryosuke Takeda, Taichi Nishikawa, Kohei Watanabe
Abstract
We investigated the variations of tracked motor unit firing properties and electrically evoked twitch contraction during the day within 24 h. The variation of motor unit firing rate was observed, and tracked motor unit firing rate increased at noon, in the evening, and at night compared with that in the morning. The variation in motor unit firing rate was independent of changes in twitch contraction. Motor unit firing rate may be affected by diurnal rhythms.
Topics & Concepts
Motor unitNeuroscienceMuscle contractionChemistryPsychologyMedicineAnatomyHeart Rate Variability and Autonomic ControlSpaceflight effects on biologyCardiovascular and exercise physiology