Effects of specific warm-up at various intensities on energy metabolism during subsequent exercise.
BACKGROUND
To investigate the effects of specific warm-up at various intensities on energy metabolism during subsequent intense exercise.


METHODS



METHODS
specific warm-up was consisted of 3 sets of wrist flexions for 5 min, with each set followed by a 3-min rest. The intensity of specific warm-up was set at 20%, 30% or 40% of maximal voluntary contraction (MVC). The subjects then performed a set of wrist flexions at 60% MVC for 4 min as the criterion exercise. For the control experiment, criterion exercise was done without specific warm-up.


METHODS
Five healthy volunteers.


METHODS
using phosphorus-31 magnetic resonance spectroscopy, spectra were obtained from the wrist flexor muscles to determine the ratio 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 warm-up. The intracellular pH during the criterion exercise after specific warm-up at 30% or 40% MVC was significantly higher than that without specific warm-up.


CONCLUSIONS
These results indicate that mild warm-up exercise could inhibit the development of intracellular acidosis during subsequent intense exercise.
Kato
Y
Y
Department of Orthopedic Surgery, School of Medicine, University of Tokushima, Kuramoto, Japan.
Ikata
T
T
Takai
H
H
Takata
S
S
Sairyo
K
K
Iwanaga
K
K
D000328:Adult; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D018482:Muscle, Skeletal / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism*; D010725:Phosphocreatine / Q000378:metabolism*; D010761:Phosphorus Radioisotopes
D010710:Phosphates; D010761:Phosphorus Radioisotopes; D010725:Phosphocreatine