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Titolo:
Effect of postactivation potentiation on dynamic knee extension performance
Autore:
Gossen, ER; Sale, DG;
Indirizzi:
McMaster Univ, Dept Kinesiol, Hamilton, ON L8S 4K1, Canada McMaster Univ Hamilton ON Canada L8S 4K1 ol, Hamilton, ON L8S 4K1, Canada
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 6, volume: 83, anno: 2000,
pagine: 524 - 530
SICI:
1439-6319(200012)83:6<524:EOPPOD>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT-CHAIN PHOSPHORYLATION; HUMAN SKELETAL-MUSCLE; MYOSIN PHOSPHORYLATION; FATIGUE; ENHANCEMENT; STAIRCASE;
Keywords:
force-velocity relationship; posttetanic potentiation; twitch contraction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Sale, DG McMaster Univ, Dept Kinesiol, Hamilton, ON L8S 4K1, Canada McMaster Univ Hamilton ON Canada L8S 4K1 ton, ON L8S 4K1, Canada
Citazione:
E.R. Gossen e D.G. Sale, "Effect of postactivation potentiation on dynamic knee extension performance", EUR J A PHY, 83(6), 2000, pp. 524-530

Abstract

Six men and four women performed, in separate trials, maximal dynamic kneeextensions with loads of 15%, 30%, 45% and 60% of maximal isometric knee extension peak torque (MVC). The dynamic extensions were done after postactivation potentiation (PAP) had been induced with a 10-s MVC, and in a control trial without PAP. PAP, measured as the increase in evoked twitch torque,was 53 (4)% (SE) and 43 (3)% at the time of the first and second extensions with each load. PAP failed to increase the attained peak velocity with any load; on the contrary, there was a trend for peak velocity to decrease inthe first extension, which occurred congruent to 15 s after the 10-s MVC. The results suggest that fatigue produced by the 10-s MVC suppressed any benefit that could be derived from the induced PAP. A surface electromyogram (EMG) recorded from one muscle of quadriceps femoris gave no indication of activation failure in the first knee extension; however, activation impairment specific to the rate of force development cannot be ruled out. It is concluded that the strategy employed, namely of having knee extensions performed soon after the 10-s MVC to maximize PAP at the time of performance, wasunsuccessful because there had been insufficient time for recovery from fatigue. It is possible that a longer recovery time, even at the cost of a diminished PAP, may have proved beneficial.

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Documento generato il 30/09/20 alle ore 09:24:40