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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111

Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 2002 Dicembre;42(3):425-30

EXERCISE PHYSIOLOGY AND BIOMECHANICS 

 Original articles

Effect of low intensity electrical stimulation on quadriceps muscle voluntary maximal strength

Valli P. 1, Boldrini L. 1, Bianchedi D. 1, Brizzi G. 2, Miserocchi G. 3

1 School of ­Sport Med­i­cine Uni­ver­sity of ­Milan, ­Milan, ­Italy
2 Sin­tesi, ­Linea di Fio­rano, Ber­gamo, Italy
3 Uni­ver­sity of ­Milano-­Bicocca, ­Milano, Italy

Back­ground. Eval­uate the ­effect of low inten­sity ­electrical stim­u­la­tion (ES) ­training on ­strength. We pur­pose­fully ­used a low ES stim­u­la­tion inten­sity to ­have it ­well ­accepted by ­middle ­aged and low per­forming ­people. ­Relate ­strength to meta­bolic param­e­ters.
­Methods. Experi­mental ­design. Pro­tocol 1: ­effects of 11 day low inten­sity ES ­training on quad­ri­ceps ­muscle max­imal vol­un­tary con­trac­tion (MVC). Pro­tocol 2: ­effects of 3 day ­training at low inten­sity ES + vol­un­tary con­trac­tion at 60% of MVC (co-con­trac­tion). Var­i­ables meas­ured: max­imal vol­un­tary ­strength (­FMAX), ­strength ­during ES (FES), ­strength devel­oped ­during co-con­trac­tion (FES-C), ­oxygen con­sump­tion, ­heart ­rate. Experi­mental ­design ­included a ­basal ses­sion, a ­training pro­gram and con­trols of meas­ured var­i­ables ­during and at the end of the ­training pro­gram. Par­tic­i­pants: pro­tocol 1: experi­ments ­were ­done on 13 ­healthy and sed­en­tary sub­jects (6 ­males and 7 ­women, ­mean age 50.6 ­years). Pro­tocol 2: experi­ments ­done on 6 ­healthy sed­en­tary men (­mean age 31.5 ­years).
­Results. Pro­tocol 1: ­FMAX ­increased sig­nif­i­cantly (p<0.05) to 14 and 19% at day 6 and 11, respec­tively. ­During ES, ­oxygen con­sump­tion ­increased by 20%, but no ­change in ­heart ­rate was ­observed. Pro­tocol 2: ­FMAX sig­nif­i­cantly ­increased (­about 5%) in sub­jects who ­trained ­with co-con­trac­tion; con­versely, ­FMAX did not sig­nif­i­cantly ­increase in a con­trol ­group ­matched for age who ­trained ­only ­with vol­un­tary con­trac­tions.
Con­clu­sions. Low inten­sity ES in sed­en­tary and ­poorly per­forming ­people ­increases sig­nif­i­cantly ­FMAX ­during MVC pos­sibly via fac­i­lit­a­tory neu­ro­genic mech­a­nism.

lingua: Inglese


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