Oxygen uptake kinetics following 20 days of unilateral lower limb suspension

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概要

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• The purpose of the present study was to examine the effect of unilateral lower limb suspension (ULLS) deconditioning on oxygen uptake kinetics. Eight healthy males underwent ULLS for 20 days and performed a series of 6-min square-wave transitions from rest to 60-W single-leg cycling exercises just before and after ULLS. To characterize the kinetics of the oxygen uptake response, a single exponential model was applied to the data until the end of the fast component omitted the first 15 s of the on-transit using a nonlinear least-squares fitting procedure. The following results were found: (i) the time constant of oxygen uptake was unchanged before and after ULLS; (ii) although there was no significant difference in the baseline and the asymptotic amplitude of the fast component, the asymptote, i.e., the absolute asymptotic amplitude of the fast component (the sum of the baseline and the asymptotic amplitude), and the end exercise oxygen uptake were decreased after ULLS; (iii) the contribution of the slow component to the total response of oxygen uptake was unchanged at pre- and post-ULLS. In conclusion, the asymptote in the fast component and the end exercise oxygen uptake were decreased after 20-d ULLS, though the response speed and the amplitude of the slow component of oxygen uptake were not changed. It is suggested that deconditioning as a result of limb disuse affects oxygen uptake response.

• 2006-10-01

著者

• Masuda Kazumi

  Faculty Of Education Kanazawa University

• Masuda Kazumi

  名古屋大学総合保健体育科学センター

• Masuda Kazumi

  Faculty Of Human Sciences Kanazawa University

• SATO Kohei

  Research Institute of Physical Fitness, Japan Women's Physical Education

• AKIMA Hiroshi

  Research Center for Health, Physical Fitness & Sports, Nagoya University

• Hotta Norio

  Research Institute Of Environmental Medicine Nagoya University:research Center Of Health Physical Fi

• ISHIDA koji

  Research Center of Health, Physical Fitness and Sports, Nagoya University

• KATAYAMA Keisho

  Research Center of Health, Physical Fitness and Sports, Nagoya University

• KOGA Shunsaku

  Applied Physiology Laboratory, Kobe Design University

• HOTTA Norio

  Graduate School of Medicine, Nagoya University

• Sato Kohei

  Research Institute Of Physical Fitness Japan Women's College Of Physical Education

• Ishida Koji

  Research Center Of Health Physical Fitness And Sports Nagoya University

• Akima Hiroshi

  Research Center Of Health Physical Fitness And Sports Nagoya University

• Akima Hiroshi

  Research Center For Health Physical Fitness & Sports Nagoya University

• Koga Shunsaku

  Applied Physiology Laboratory Kobe Design University

• Miyachi Motohiko

  Laboratory of Physical Activity and Health Evaluation, National Institute of Health and Nutrition

• Katayama Keisho

  Research Center Of Health Physical Fitness And Sports Nagoya University

• Katayama Keisho

  Research Center Of Health And Sports Nagoya University

• Miyachi Motohiko

  Laboratory Of Physical Activity And Health Evaluation National Institute Of Health And Nutrition

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