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The Journal of Sports Medicine and Physical Fitness 2000 June;40(2):126-30

Copyright © 2002 EDIZIONI MINERVA MEDICA

lingua: Inglese

Effects of specific warm-up at various intensities on energy metabolism during subsequent exercise

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


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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.

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