Effects of temperature on the maximal instantaneous muscle power of humans |
| |
Authors: | G Ferretti M Ishii C Moia P Cerretelli |
| |
Institution: | (1) Département de Physiologie, Centre Médical Universitaire, Avenue de Champel 9, 1211 Genève 4, Switzerland |
| |
Abstract: | Summary The maximal instantaneous muscle power (
) probably reflects the maximal rate of adenosine 5 -triphosphate (ATP) hydrolysis (
), a temperature-dependent variable, which gives rise to the hypothesis that temperature, by affecting
, may also influence
. This hypothesis was tested on six subjects, whose vastus lateralis muscle temperature (T
muscle) was monitored by a thermocouple inserted approximately 3 cm below the skin surface. The
was determined during a series of high jumps off both feet on a force platform before and after immersion up to the abdomen for 90 min in a temperature controlled (T=20±0.1°C) water bath. ControlT
muscle was 35.8±0.7°C, with control
being 51.6 (SD 8.7) W · kg–1. After cold exposure,T
muscle decreased by about 8°C, whereas
27% lower. The temperature dependence of
was found to be less (Q
10 < 1.5, whereQ
10 is the temperature coefficient as calculated in other studies) than reported in the literature for
. Such a lowQ
10 may reflect an increase in the mechanical equivalent of ATP splitting, as a consequence of the reduced velocity of muscle contraction occurring at lowT
muscle. |
| |
Keywords: | Anaerobic alactic metabolism Adenosine 5 -triphosphate" target="_blank">gif" alt="prime" align="BASELINE" BORDER="0">-triphosphate Maximal muscle power Muscle temperature Q
10 |
本文献已被 SpringerLink 等数据库收录! |
|