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Titolo:
MUSCLE PERFORMANCE AND ELECTROMYOGRAM ACTIVITY OF THE LOWER LEG MUSCLES WITH DIFFERENT LEVELS OF COLD-EXPOSURE
Autore:
OKSA J; RINTAMAKI H; RISSANEN S;
Indirizzi:
OULU REG INST OCCUPAT HLTH,PHYSIOL LAB,AAPISTIE 1 FIN-90220 OULU FINLAND
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 6, volume: 75, anno: 1997,
pagine: 484 - 490
SICI:
0301-5548(1997)75:6<484:MPAEAO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
POWER OUTPUT; TEMPERATURE; HUMANS;
Keywords:
COOLING; MUSCLE FUNCTION; STRETCH-SHORTENING CYCLE; AGONIST; ANTAGONIST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
J. Oksa et al., "MUSCLE PERFORMANCE AND ELECTROMYOGRAM ACTIVITY OF THE LOWER LEG MUSCLES WITH DIFFERENT LEVELS OF COLD-EXPOSURE", European journal of applied physiology and occupational physiology, 75(6), 1997, pp. 484-490

Abstract

The purpose of this study was to evaluate the relationship between different levels of body cooling and muscle performance decrement and tostudy the motor eo-ordination of the working agonist-antagonist muscle pair of the lower leg. Eight volunteer male subjects dropped from a 40-cm bench on to a force plate and performed a maximal rebound jump (stretch-shortening cycle). The jumps were performed after 60-min exposures to 27 degrees C, 20 degrees C, 15 degrees C and 10 degrees C. In comparison to those at 27 degrees C, all the exposures to lower temperatures decreased the flight time of the jump, average force productionand take-off velocity in a dose-dependent manner. The changes in electromyogram (EMG) activity also behaved in a dose-dependent manner. During preactivity and stretch phases the integrated EMG (iMEG) activity of the agonist muscle (triceps surae) increased due to cooling (at 10 degrees C, P < 0.05). In contrast, during the shortening phase iEMG ofthe agonist muscle decreased due to cooling (at 15 degrees C and 10 degrees C, P < 0.05). Moreover, the activity of the antagonist muscle (tibialis anterior) increased due to cooling (at 15 degrees C and 10 degrees C. P < 0.01). The mean power frequency of the agonist muscle during the shortening-phase was shifted from 124 (SEM 12) Wt (at 27 degrees C) to S1(SEM 7) Wt (at 10 degrees C, P < 0.01). We concluded that there was a dose-dependent response between the degree of cooling and the amount of decrease in muscle performance as well as EMG activity changes. A relatively low level of cooling was sufficient to decrease muscle performance significantly.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 01:27:34