<Originals>Relationship between the Changing Point of the Step Frequency and VT During Running at an Increasing Speed
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概要
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FURUKI, H., OKUMURA, M., KIYOTA, H., and TAKLEMIYA, t., Relationship between the Changing Point of the Step Freqency and VT During Running at an Ingreasing Speed. Abv. Exerc. Sports Physiol., Vol.10, No.4 pp.101-106, 2004. If the step frequency during runnning affects the functions of the thoracic pump dependent on the upper limb movements and the muscle pimp dependent on the upper limb movements and the muscle pump dependent on the lower limb movements, it can be hypothesized that changes in the step frequency have some relations with not only the efficiency of gas exchange but also the blood-borne gas transport. This study was carried out to examine the relationship between changes in the step frequency associated with ingreases in the running speed on a treadmill and ventilation threshold(VT), or the oxygen kinetics. The subjects were 6 male short-distance runners. The experiment was performed on a treadmill by the incremental loading method, and the step frequency, stride, expired gas concentrations, and fingertip arterial blood percent oxygen saturaiton recorded continuously. The experiment demonstrated the presence of a changing point in the step frequency, positive correlations of the stride with oxygen uotake (VO2) and CO2 excretion (VCO2), and negative exponential relationships of the step grequency with VO2 and VCO2. According to the regression equation, the stride and the step frequency at the appearance of VT were 121.1cm and 171.2 steps/min, respectively. The fingertip arterial blood percent oxygen saturation decreased immediately after the appearance of VT. The changing point of step frequency, the appearance fo VT, and the beginning of the decrease in the oxygen concentration were found to be nearly concurrent. These results suggest that a rapid increase in the step frequency is related to VT, that this relationship is based on the actions of the muscle pump and thoracic pump, which regulate the rates of Os supply and COs discharge, and that physiologic consistency of these functions results in the change in the step frequency.
- 日本運動生理学会の論文
著者
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Takemiya Takashi
Graduate School Nippon Sport Science University
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Takemiya Takashi
Graduate School Of Health And Sport Science Nippon Sport Science University
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Kiyota Hiroshi
Nippon Sport Science Univ.
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Kiyota Hiroshi
Nippon Sport Science University
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FURUKI Hiroko
Graduate school Nippon Sport Science University
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OKUMURA Mari
Graduate School of Health and Sport Science, Nippon Sport Science University
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Furuki Hiroko
Graduate School Of Health And Sport Science Nippon Sport Science University
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Okumura Mari
Graduate School Of Health And Sport Science Nippon Sport Science University
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