Y. Kato et al., Effects of specific warm-up at various intensities on energy metabolism during subsequent exercise, J SPORT MED, 40(2), 2000, pp. 126-130
Background. To investigate the effects of specific warm-up at various inten
sities on energy metabolism during subsequent intense exercise.
Methods. Experimental design: specific warm-up was consisted of 3 sets of w
rist flexions for 5 min, with each set followed by a 3-min rest. The intens
ity of specific warm-up was set at 20%, 30% or 40% of maximal voluntary con
traction (MVC). The subjects then performed a set of wrist flexions at 60%
MVC for 4 min as the criterion exercise, For the control experiment, criter
ion exercise was done without specific warm-up. Participants: Five healthy
volunteers. Measurements: using phosphorus-31 magnetic resonance spectrosco
py, spectra were obtained from the wrist flexor muscles to determine the ra
tio of inorganic phosphate to phosphocreatine (Pi/PCr) and intracellular pH
.
Results. The Pi/PCr during the criterion exercise after specific warm-up at
any intensity was not significantly different from that without specific w
arm-up. The intracellular pH during the criterion exercise after specific w
arm-up at 30% or 40% MVC was significantly higher than that without specifi
c warm-up.
Conclusions. These results indicate that mild warm-up exercise could inhibi
t the development of intracellular acidosis during subsequent intense exerc
ise.