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Titolo:
Effect of exhausting stretch-shortening cycle exercise on the time course of mechanical behaviour in the drop jump: possible role of muscle damage
Autore:
Horita, T; Komi, PV; Nicol, C; Kyrolainen, H;
Indirizzi:
Univskyla,kyla, Neuromuscular Res Ctr, Dept Biol Phys Activ, FIN-40351 Jyva Univ Jyvaskyla Jyvaskyla Finland FIN-40351 ol Phys Activ, FIN-40351 Jyva
Titolo Testata:
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY
fascicolo: 2, volume: 79, anno: 1999,
pagine: 160 - 167
SICI:
0301-5548(199901)79:2<160:EOESCE>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
CREATINE-KINASE CHANGES; LEG EXTENSOR MUSCLES; ECCENTRIC EXERCISE; SKELETAL-MUSCLE; INDUCED INJURY; CONTRACTIONS; STIFFNESS; FATIGUE; TENSION; FIBERS;
Keywords:
stretch-shortening cycle; muscle mechanics and damage; fatigue; drop jump; motor control;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Komi, PV Univ351vaskyla, Neuromuscular Res Ctr, Dept Biol Phys Activ, POB 35, FIN-40 Univ Jyvaskyla POB 35 Jyvaskyla Finland FIN-40351 POB 35, FIN-40
Citazione:
T. Horita et al., "Effect of exhausting stretch-shortening cycle exercise on the time course of mechanical behaviour in the drop jump: possible role of muscle damage", EUR J A PHY, 79(2), 1999, pp. 160-167

Abstract

The purpose of the present study was to investigate the effect of stretch-shortening-cycle-induced muscle damage on the time course of mechanical behaviour in the drop jump. Ten healthy male subjects performed submaximal stretch-shortening cycle (SSC) exercise on a special sledge apparatus. Exhaustion occurred on average within 3 min. A drop jump (DJ) test from a 50-cm height was performed before and immediately after the sledge exercise as wellas 3 h, 2 days and 4 days later. The fatigue exercise showed relatively high blood lactate concentration [12.5 (SD 2.6) mmol . l(-1)] and an increaseof serum creatine kinase (CK) activity delayed by 2 days [540 (SD 407)U . l(-1)]. The initial decline in the jump performance (before - immediately after) was related negatively to the early recovery in performance (immediately after - 2 h) (P < 0.05). The early recovery of the knee joint moment atthe end of stretch showed a negative correlation to the delayed decrease in DJ performance (2 h - 2 days) (P < 0.01). Thus, the DJ performance showedan initial decline followed by an early recovery and a secondary decline. Both the initial decline and early recovery in the knee joint moment at theend of stretch were related to the corresponding initial (after - 2 h) (P < 0.05) and secondary increases (2 h - 2 days) (P < 0.01) in CK. It is suggested that the early recovery as well as the initial decline in the knee joint function could depend on the degree of muscle damage. Delayed decrease in initial stiffness (2 h - 2 days) was negatively related to the corresponding changes in the knee joint angle at touch down in DJ (P < 0.001). Theseinteractions would imply that the decrease in the stiffness regulation andthe modulation of the prelanding motor control might be attributable to secondary muscle damage during 2 days after the SSC exercise. Therefore, it may be suggested that the changes in the DJ performance after the exhaustingSSC exercise accompany the progress of muscle damage observed by the corresponding increase in serum CK concentration and the corresponding deterioration of stiffness regulation and motor control in DJ.

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Documento generato il 09/07/20 alle ore 23:51:07