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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
Kato Y., Ikata T., Takai H., Takata S., Sairyo K., Iwanaga K. *
From the Department of Orthopedic Surgery, School of Medicine University of Tokushima, Kuramoto, Tokushima, Japan
* Saga Research Institute, Otsuka Pharmaceutical Co., Ltd., Higashisefuri, Kanzaki, Saga, Japan
Background. To investigate the effects of specific warm-up at various intensities on energy metabolism during subsequent intense exercise.
Methods. Experimental design: 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. Participants: Five healthy volunteers. Measurements: 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.