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Titolo:
Effect of muscle mass on Vo(2) kinetics at the onset of work
Autore:
Koga, S; Barstow, TJ; Shiojiri, T; Takaishi, T; Fukuba, Y; Kondo, N; Shibasaki, M; Poole, DC;
Indirizzi:
Kobe Design Univ, Appl Physiol Lab, Nishi Ku, Kobe, Hyogo 6512196, Japan Kobe Design Univ Kobe Hyogo Japan 6512196 Ku, Kobe, Hyogo 6512196, Japan Yokohama City Univ, Yokohama, Kanagawa 2360027, Japan Yokohama City Univ Yokohama Kanagawa Japan 2360027 anagawa 2360027, Japan Nagoya City Univ, Nagoya, Aichi 4678501, Japan Nagoya City Univ Nagoya Aichi Japan 4678501 Nagoya, Aichi 4678501, Japan Hiroshima Womens Univ, Hiroshima 7348558, Japan Hiroshima Womens Univ Hiroshima Japan 7348558 , Hiroshima 7348558, Japan Kobe Univ, Kobe, Hyogo 6570011, Japan Kobe Univ Kobe Hyogo Japan 6570011Kobe Univ, Kobe, Hyogo 6570011, Japan Kansas State Univ, Dept Kinesiol, Manhattan, KS 66506 USA Kansas State Univ Manhattan KS USA 66506 inesiol, Manhattan, KS 66506 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 2, volume: 90, anno: 2001,
pagine: 461 - 468
SICI:
8750-7587(200102)90:2<461:EOMMOV>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXYGEN-UPTAKE KINETICS; GAS-EXCHANGE KINETICS; HIGH-INTENSITY EXERCISE; DYNAMIC KNEE EXTENSION; HEAVY EXERCISE; O-2 UPTAKE; CARDIORESPIRATORY KINETICS; SUBMAXIMAL EXERCISE; MODERATE EXERCISE; SLOW COMPONENT;
Keywords:
exercise energetics; one-leg exercise; pulmonary gas exchange; muscle recruitment; control of muscle oxygen uptake;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Koga, S Kobe Design Univ, Appl Physiol Lab, Nishi Ku, 8-1-1 Gakuennishi Machi, Kobe, Hyogo 6512196, Japan Kobe Design Univ 8-1-1 Gakuennishi Machi Kobe Hyogo Japan 6512196
Citazione:
S. Koga et al., "Effect of muscle mass on Vo(2) kinetics at the onset of work", J APP PHYSL, 90(2), 2001, pp. 461-468

Abstract

The dependence of O-2 uptake ((V) over dot o(2)) kinetics on the muscle mass recruited under conditions when fiber and muscle recruitment patterns are similar following the onset of exercise has not been determined. We developed a motorized cycle ergometer that facilitated one-leg (1L) cycling in which the electromyographic (EMG) profile of the active muscles was not discernibly altered from that during two-leg (2L) cycling. Six subjects performed 1L and 2L exercise transitions from unloaded cycling to moderate [<ventilatory threshold (VT)] and heavy (>VT) exercise. The 1L condition yielded kinetics that was unchanged from the 2L condition [the phase 2 time constants (tau (1), in s) for <VT were as follows: 1L = 16.8 +/- 8.4 (SD), 2L = 18.4 +/- 8.1, P > 0.05; for >VT: 1L = 26.8 +/- 12.0; 2L = 27.8 +/- 16.1, P > 0.05]. The overall (V) over dot o(2) kinetics (mean response time) was not significantly different for the two exercise conditions. However, the gain of the fast component (the amplitude/work rate) during the 1L exercise was significantly higher than that for the 2L exercise for both moderate and heavy work rates. The slow-component responses evident for heavy exercise weretemporally and quantitatively unaffected by the 1L condition. These data demonstrate that, when leg muscle recruitment patterns are unchanged as assessed by EMC analysis, on-transient ire, kinetics for both moderate and heavy exercise are not dependent on the muscle mass recruited.

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Documento generato il 05/04/20 alle ore 22:56:30