ISSN:
1439-6327
Keywords:
Anaerobic alactic metabolism
;
Adenosine 5′-triphosphate
;
Maximal muscle power
;
Muscle temperature
;
Q 10
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary The maximal instantaneous muscle power ( $$\dot w_{i,\max } $$ ) probably reflects the maximal rate of adenosine 5′-triphosphate (ATP) hydrolysis ( $$A\dot TP_{\max } $$ ), a temperature-dependent variable, which gives rise to the hypothesis that temperature, by affecting $$A\dot TP_{\max } $$ , may also influence $$\dot w_{i,\max } $$ . 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 $$\dot W_{i,\max } $$ 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 $$\dot W_{i,\max } $$ being 51.6 (SD 8.7) W · kg−1. After cold exposure,T muscle decreased by about 8°C, whereas $$\dot w_{i,\max } $$ 27% lower. The temperature dependence of $$\dot W_{i,\max } $$ 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 $$A\dot TP_{\max } $$ . 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00717947
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