2005 Fiscal Year Final Research Report Summary
STUDY OF MUSCLE FATIGUE IN ELBOW FLEXION EXERCISE
| Project/Area Number |
16500407
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Sports science
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
USUI Sachio Hiroshima University, Faculty of Integrate Arts and Sciences, Associated Professor, 総合科学部, 助教授 (10116543)
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| Project Period (FY) |
2004 – 2005
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| Keywords | muscle fatigue / muscular endurance / fatigue threshold / anaerobic work capacity / critical power / 運動継続時間 |
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| Research Abstract |
In a set of exercises at a constant work rate there is a hyperbolic relationship between the power output and the time to exhaustion. The P-t relationship described in (P-CP) t=W', has been reported using leg cycle ergometer, arm cranking ergometer, treadmill running, kayak ergometer, flume swimming and so on. The power asymptote of the relationship, CP(critical power, fatigue threshold), is interpreted as power can be sustained without fatigue theoretically. The other parameter of the relationship, W'(anaerobic work capacity), is provides a measure of anaerobic capacity. It is not well known whether the P-t relationship is also seen in single-joint exercise. Therefore, the purpose of this study is to investigate the relationship power and time in elbow flexion exercise, and the effect of exercise frequency on the parameters.
Nine males were severed as subject. The exercise were a repeated elbow flexion at a constant work load in a sitting position using three exercise tempi,30,60,90rpm. As a result, the linear regression analysis of P-inverse t relationship showed high correlation coefficients. There are, however, some exceptions, that is, the exercise with a shorter endurance time within 30s. The faster paced exercise made the aerobic parameter CP larger and made the anaerobic parameter W' smaller. The fast exercise had a larger ratio of total duration time of muscle contraction to total exercise time. Because of the longer contraction time, the blood flow to the active muscle can be partially occluded.
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