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Titolo:
Effect of strenuous strength training on the Na-K pump concentration in skeletal muscle of well-trained men
Autore:
Medbo, JI; Jebens, E; Vikne, H; Refsnes, PE; Gramvik, P;
Indirizzi:
Natl Inst Occupat Hlth, N-00338149 Oslo, Norway Natl Inst Occupat Hlth Oslo Norway N-00338149 h, N-00338149 Oslo, Norway Natl Olympic Training Ctr, N-0806 Oslo, Norway Natl Olympic Training Ctr Oslo Norway N-0806 ng Ctr, N-0806 Oslo, Norway Norwegian Univ Sport & Phys Educ, N-0806 Oslo, Norway Norwegian Univ Sport& Phys Educ Oslo Norway N-0806 N-0806 Oslo, Norway Agder Coll, Fac Hlth & Sports, N-4604 Kristiansand, Norway Agder Coll Kristiansand Norway N-4604 ports, N-4604 Kristiansand, Norway
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1-2, volume: 84, anno: 2001,
pagine: 148 - 154
SICI:
1439-6319(200101/02)84:1-2<148:EOSSTO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
OUABAIN-H-3 BINDING-SITES; ATPASE CONCENTRATION; VASTUS LATERALIS; EXERCISE; INCREASES; QUANTIFICATION; HYPERKALEMIA; NA,K-ATPASE; TRANSPORT; BIOPSIES;
Keywords:
alpine skiing; Na+-K+-exchanging ATPase; sodium-potassium pump; squat lifting; strength training;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Medbo, JI Natl Inst Occupat Hlth, POB 8149 Dep, N-00338149 Oslo, Norway Natl Inst Occupat Hlth POB 8149 Dep Oslo Norway N-00338149 rway
Citazione:
J.I. Medbo et al., "Effect of strenuous strength training on the Na-K pump concentration in skeletal muscle of well-trained men", EUR J A PHY, 84(1-2), 2001, pp. 148-154

Abstract

This study examined how strenuous strength training affected the Na-K pumpconcentration In the knee extensor muscle of well-trained men and whether leg muscle strength and endurance was related to the pump concentration. First, the pump concentration, taken as H-3-ouabain binding, was measured in top alpine skiers since strength training is important to them. Second, well-trained subjects carried out strenuous eccentric resistance training either 1, 2, or 3 times . week(-1) for 3 months. The Na-K pump concentration, the maximal muscle strength in a full squat lift tone repetition maximum, I RM), and the muscle endurance, taken as the number of full squat lifts of amass of 70% of the 1 RM load, were measured before and after the training period. The mean pump concentration of the alpine skiers was 425 (SEM 11) nmol . kg(-1) wet muscle mass. The subjects in part two increased their maximal strength in a dose-dependent manner. The muscle endurance increased forall subjects but independently of the training programme. From a mean starting value of 356 (SEM 6) nmol . kg(-1) the mean Na-K pump concentration increased by 54 (SEM 15) nmol . kg(-1) (+15%, P < 0.001) when the results forall subjects were pooled. The effect was larger for those who had trained twice a week than for those who had trained only once a week (P = 0.025), suggesting that the effect of strength training depended on the amount of training carried out. The muscle strength and endurance were not related to the pump concentration, suggesting that the pumping power of this enzyme didnot limit the performance during heavy lifting. However, the individual improvements in the endurance test during the training period correlated withthe individual changes in the pump concentration (r(Spearman) = 0.5; P = 0.01) which could mean that a common factor both increases the pump concentration and makes the muscles more adapted to repeated heavy lifting.

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Documento generato il 21/01/20 alle ore 01:32:14