Journal of Applied Physiology AJP: Gastrointestinal and Liver Physiology
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J Appl Physiol 92: 2467-2474, 2002; doi:10.1152/japplphysiol.00207.2001
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Vol. 92, Issue 6, 2467-2474, June 2002

VO2 kinetics in heavy exercise is not altered by prior exercise with a different muscle group

Yoshiyuki Fukuba1, Naoyuki Hayashi2, Shunsaku Koga3, and Takayoshi Yoshida2

1 Department of Exercise Science and Physiology, School of Health Sciences, Hiroshima Women's University, Hiroshima 734-8558; 2 Laboratory of Exercise Physiology, Faculty of Health and Sport Sciences, Osaka University, Toyonaka 560-0043; 3 Applied Physiology Laboratory, Kobe Design University, Kobe 651-2196, Japan

We examined whether lactic acidemia-induced hyperemia at the onset of high-intensity leg exercise contributed to the speeding of pulmonary O2 uptake (VO2) after prior heavy exercise of the same muscle group or a different muscle group (i.e., arm). Six healthy male subjects performed two protocols that consisted of two consecutive 6-min exercise bouts separated by a 6-min baseline at 0 W: 1) both bouts of heavy (work rate: 50% of lactate threshold to maximal VO2) leg cycling (L1-ex to L2-ex) and 2) heavy arm cranking followed by identical heavy leg cycling bout (A1-ex to A2-ex). Blood lactate concentrations before L1-ex, L2-ex, and A2-ex averaged 1.7 ± 0.3, 5.6 ± 0.9, and 6.7 ± 1.4 meq/l, respectively. An "effective" time constant (tau ) of VO2 with the use of the monoexponential model in L2-ex (tau : 36.8 ± 4.3 s) was significantly faster than that in L1-ex (tau : 52.3 ± 8.2 s). Warm-up arm cranking did not facilitate the VO2 kinetics for the following A2-ex [tau : 51.7 ± 9.7 s]. The double-exponential model revealed no significant change of primary tau  (phase II) VO2 kinetics. Instead, the speeding seen in the effective tau  during L2-ex was mainly due to a reduction of the VO2 slow component. Near-infrared spectroscopy indicated that the degree of hyperemia in working leg muscles was significantly higher at the onset of L2-ex than A2-ex. In conclusion, facilitation of VO2 kinetics during heavy exercise preceded by an intense warm-up exercise was caused principally by a reduction in the slow component, and it appears unlikely that this could be ascribed exclusively to systemic lactic acidosis.

lactic acidemia; exercise hyperemia; near-infrared spectroscopy; oxygen uptake


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