Original articles   

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

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.