Abstract
561 Twitches were evoked in the dorsiflexors of 10 young men before and after a 7-s tetanus at 100 Hz in a control (ambient air) condition (CON) and after warm (45 °C, 45C) and cold (10 °C, 10C) 30 min water baths. Compared to CON, 10C decreased tetanus (27%) and pretetanus twitch peak torque (PT, 26%), but increased rise time (RT, 80%), half-relaxation time (HRT, 91%), and muscle action potential (MAP) amplitude (24%); 45C had little effect. PT potentiation (PTP) 5 s posttetanus was greatest in 45C (52%; 10C, 40%; CON, 47%), but by 6 min PTP was greater in 10C (19%; 45C, 8%; CON, 9%), and remained greater (10C, 16%; CON, -1%; 45C, -4%) at 12 min. Posttetanus MAP at 5 s changed most after 45C (-4.5%; CON, -2.0%; 10C, 0.2%). MAP at 12 min was increased in 10C (5.2%) and CON (4.7%) but decreased at 45C (-3.4%). CON had the greatest 5 s decrease in RT (-9.4%; 45C, -6.8%; 10C, -2.9%) and HRT(-20.2%, 45C, -14.5%; 10C, -7.8%), but 45C had the greatest increase at 12 min in RT (15.5%; 10C, 7.4%; CON, 4.4%) and HRT (14.5%; CON, 2.2%; 10C, -5.2%). The data indicate a marked and complex effect of temperature on PTP in human muscle.
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