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Titolo:
EFFECT OF ACUTE NORMOBARIC HYPOXIA ON QUADRICEPS INTEGRATED ELECTROMYOGRAM AND BLOOD METABOLITES DURING INCREMENTAL EXERCISE TO EXHAUSTION
Autore:
TAYLOR AD; BRONKS R;
Indirizzi:
SO CROSS UNIV,CTR HUMAN MOVEMENT SCI & SPORTS MANAGEMENT LISMORE NSW 2480 AUSTRALIA
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 1-2, volume: 73, anno: 1996,
pagine: 121 - 129
SICI:
0301-5548(1996)73:1-2<121:EOANHO>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; OXYGEN-UPTAKE; SEA-LEVEL; SUBMAXIMAL EXERCISE; ANAEROBIC THRESHOLD; ENERGY-METABOLISM; EMG; ERGOMETER; LACTATE; AVAILABILITY;
Keywords:
ENVIRONMENTAL HYPOXIA; NORMOXIA; INTEGRATED ELECTROMYOGRAM; QUADRICEPS MUSCLE; PLASMA LACTATE AND AMMONIA CONCENTRATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
41
Recensione:
Indirizzi per estratti:
Citazione:
A.D. Taylor e R. Bronks, "EFFECT OF ACUTE NORMOBARIC HYPOXIA ON QUADRICEPS INTEGRATED ELECTROMYOGRAM AND BLOOD METABOLITES DURING INCREMENTAL EXERCISE TO EXHAUSTION", European journal of applied physiology and occupational physiology, 73(1-2), 1996, pp. 121-129

Abstract

This investigation analysed the effects of environmental hypoxia (EH)on changes in quadriceps integrated electromyogram (iEMG) and accumulation during incremental cycle Trained male subjects (n = 14) were required to complete two maximal oxygen uptake (VO2max) tests, one test during EH (FIO2 = 0.135), the other during normoxia (FIO2 = 0.2093). The EMG were recorded at each exercise intensity from the vastus lateralis, rectus femoris and vastus medialis muscles over 60 cycle revolutions. Mean integral values were then calculated. Blood was collected from the radial vein of consenting subjects (n = 8) at the end of each exercise intensity. Oxygen saturation of arterial blood (SaO2) was estimated using pulse oximetry. Gas exchange variables were collected on-line every 15 s. The results indicated that, without exception, EH significantly reduced total exercise time. Mean time to exhaustion in EH was 26.34 (SD 2.58) min compared with 35.25 (SD 4.21) min during N. The SaO2 values indicated that severe arterial desaturation had been achieved by EH. Mean values for VO2max obtained in EH were 49 ml . kg . min(-1), compared with 59 ml . kg . min(-1) attained in N. Plasma lactateand ammonia concentrations were both significantly higher in EH. Increases in lactate and ammonia concentration were highly correlated in both N and EH. The onset of plasma lactate and ammonia accumulation occurred at the same exercise intensity in N. The iEMG responses of all three quadriceps muscles tended to be greater in the EH trials, although this difference was not significant. The basis for iEMG nonsignificance may have been related to large within sample variation ill iEMG7, sample size and the severity of the hypoxia induced.

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Documento generato il 08/07/20 alle ore 07:38:18