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Titolo:
ELECTROMYOGRAPHIC CORRELATES OF THE TRANSITION FROM AEROBIC TO ANAEROBIC METABOLISM IN TREADMILL RUNNING
Autore:
TAYLOR AD; BRONKS R;
Indirizzi:
SO CROSS UNIV,CTR HUMAN MOVEMENT & SPORTS MANAGEMENT LISMORE NSW 2480AUSTRALIA SO CROSS UNIV,CTR HUMAN MOVEMENT & SPORTS MANAGEMENT LISMORE NSW 2480AUSTRALIA
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 6, volume: 69, anno: 1994,
pagine: 508 - 515
SICI:
0301-5548(1994)69:6<508:ECOTTF>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONDUCTION-VELOCITY; POWER SPECTRUM; MOTOR UNIT; SURFACE ELECTROMYOGRAM; LACTATE ACCUMULATION; MUSCULAR FATIGUE; FUTURE-RESEARCH; RE-EXAMINATION; THRESHOLD; MUSCLE;
Keywords:
INTEGRATED ELECTROMYOGRAPHY; MEAN POWER FREQUENCY; LACTATE THRESHOLD; VENTILATORY THRESHOLD; TREADMILL RUNNING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
A.D. Taylor e R. Bronks, "ELECTROMYOGRAPHIC CORRELATES OF THE TRANSITION FROM AEROBIC TO ANAEROBIC METABOLISM IN TREADMILL RUNNING", European journal of applied physiology and occupational physiology, 69(6), 1994, pp. 508-515

Abstract

This study analysed the changes in electromyographic (EMG) activity of the vastus lateralis, biceps femoris and gastrocnemius muscles during incremental treadmill running. The changes in EMG were related to the lactate and ventilatory thresholds. Ten trained subjects participated in the study. Minute ventilation, oxygen consumption, carbon dioxideexpired and the fraction of oxygen in the expired gas were recorded continuously. Venous blood samples were collected at each exercise intensity and analysed for lactate concentration. The EMG were recorded atthe end of each exercise intensity using surface electrodes. The EMG were quantified through integration (iEMG) and by calculating the meanpower frequency (MPF). The iEMG measurements were characterized by a breakpoint in the vastus lateralis and/or gastrocnemius muscles in eight of the subjects tested. However, the results indicated that blood lactate concentrations had already begun to increase in a nonlinear fashion before the iEMG breakpoint had been surpassed. Consequently, the occurence of the lactate threshold cannot be attributed solely to the change in motor unit recruitment or rate coding patterns demonstrated by the iEMG breakpoint. The ventilatory threshold was shown to be a far more reliable and convenient noninvasive predictor of the lactate threshold in comparison with EMG techniques. In conclusion, the EMG measurements used in this study (i.e. iEMG and MPF) were not considered tobe viable noninvasive determinants of the aerobic-anaerobic transition phase in treadmill running.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 02:42:07