Journal of Applied Physiology
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J Appl Physiol 87: 253-260, 1999;
8750-7587/99 $5.00
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Vol. 87, Issue 1, 253-260, July 1999

Kinetics of oxygen uptake during supine and upright heavy exercise

Shunsaku Koga1, Tomoyuki Shiojiri2, Manabu Shibasaki3, Narihiko Kondo3, Yoshiyuki Fukuba4, and Thomas J. Barstow5

1 Applied Physiology Laboratory, Kobe Design University, Kobe 651-2196; 2 Laboratory of Exercise and Sports Science, Yokohama City University, Yokohama 236-0027; 3 Faculty of Human Development, Kobe University, Kobe 657-0011; 4 Department of Exercise Science and Physiology, Hiroshima Women's University, Hiroshima 734-8558, Japan; and 5 Department of Kinesiology, Kansas State University, Manhattan, Kansas 66506-0302

It is presently unclear how the fast and slow components of pulmonary oxygen uptake (VO2) kinetics would be altered by body posture during heavy exercise [i.e., above the lactate threshold (LT)]. Nine subjects performed transitions from unloaded cycling to work rates representing moderate (below the estimated LT) and heavy exercise (VO2 equal to 50% of the difference between LT and peak VO2) under conditions of upright and supine positions. During moderate exercise, the steady-state increase in VO2 was similar in the two positions, but VO2 kinetics were slower in the supine position. During heavy exercise, the rate of adjustment of VO2 to the 6-min value was also slower in the supine position but was characterized by a significant reduction in the amplitude of the fast component of VO2, without a significant slowing of the phase 2 time constant. However, the amplitude of the slow component was significantly increased, such that the end-exercise VO2 was the same in the two positions. The changes in VO2 kinetics for the supine vs. upright position were paralleled by a blunted response of heart rate at 2 min into exercise during supine compared with upright heavy exercise. Thus the supine position was associated with not only a greater amplitude of the slow component for VO2 but also, concomitantly, with a reduced amplitude of the fast component; this latter effect may be due, at least in part, to an attenuated early rise in heart rate in the supine position.

posture; gas exchange kinetics; oxygen transport; slow component of oxygen uptake


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