Gas exchange parameters, muscle blood flow and electromechanical properties of the plantar flexors

  • T. Moritani
  • M. J. Berry
  • D. W. Bacharach
  • E. Nakamura
Article

Summary

Sixteen men were tested to determine\(\dot V_{{\text{O}}_{{\text{2 max}}} } \) (ml · kg−1 · min−1), anaerobic threshold\(\dot V_{{\text{O}}_{\text{2}} } {\text{ (AT}}\dot V_{{\text{O}}_{\text{2}} } {\text{)}}\) and oxygen kinetics (time constant, T. C.) during running on a treadmill. For measuring maximal calf blood flow (maxBF, ml · 100 ml−1 · min−1), venous occlusion plethysmography was employed immediately following a combination of arterial occlusion and toe raising exercise to exhaustion. In addition, supramaximal electrical stimulations were given to determine maximal calf twitch force (Fmax, N), maximal rate of twitch force development (dF/dt) and relaxation (R · dF/dt, N · ms−1) and electro-mechanical delay time (EMD, ms). Results demonstrated that\(\dot V_{{\text{O}}_{{\text{2 max}}} } \) and maxBF were all inversely related to T.C. (p<0.05). MaxBF and\({\text{AT}}\dot V_{{\text{O}}_{\text{2}} } \) showed the highest correlation (r = 0.89,p<0.01). Stepwise multiple linear regression analyses revealed that variance in\(\dot V_{{\text{O}}_{{\text{2 max}}} } \) (60%) and\({\text{AT}}\dot V_{{\text{O}}_{\text{2}} } \) (84%) could be accounted for by the combined effects of the following peripheral factors:
$$\begin{gathered} \dot V_{{\text{O}}_{{\text{2 max}}} } = 51,25 - 3.24({{{\text{dF}}} \mathord{\left/ {\vphantom {{{\text{dF}}} {{\text{dt}}}}} \right. \kern-\nulldelimiterspace} {{\text{dt}}}}) + 0.14(\max {\text{BF}}),{\text{ and}} \hfill \\ {\text{AT}}\dot V_{{\text{O}}_{\text{2}} } = 11.68 + 0.42(\max {\text{BF}}) - 0.2({\text{F}}_{{\text{max}}} ) \hfill \\ \end{gathered} $$
These findings, together with the results of cluster analysis, suggest a tight link between\({\text{AT}}\dot V_{{\text{O}}_{\text{2}} } \) and peripheral blood flow capacity. On the other hand, a moderate correlation (r=0.64,p<0.01) between\(\dot V_{{\text{O}}_{{\text{2 max}}} } \) and maxBF might be due in part to individual differences in oxygen extraction-utilization capacity during heavy exercise above anaerobic threshold.

Key words

Gas exchange Muscle twitch dF/dt EMD 

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • T. Moritani
    • 1
    • 2
  • M. J. Berry
    • 1
    • 2
  • D. W. Bacharach
    • 1
    • 2
  • E. Nakamura
    • 1
    • 2
  1. 1.Human Performance LaboratoryHoken-taiku, Kyoto UniversityKyotoJapan
  2. 2.Department of Health and Physical EducationTexas A & M UniversityCollege StationUSA

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