The fatigue threshold (rheta_F) in humans : Its physiological bases and applications

人类疲劳阈值（rheta_F）：其生理基础和应用

• 批准号: 07680120
• 负责人: FUKUBA Yoshiyuki
• 金额: $ 1.47万
• 依托单位: Hiroshima Women's University (1996-1997)Hiroshima University (1995)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07680120/
• 关键词: sports performance; heavy exercise; fatigue threshold (rheta_F); exercise intensity; anaerobic power; exercise physiology; race pace allocation

It has been repeatedly demonstrated that the tolerable duration (t) of high intensity exercise in humans decreases hyperbolically as a function of power (P) with an asymptote that has been termed the "fatigue threshold" (rheta_F), that is, (P-rheta_F)*t=W', where W' is a curvature constant and represents a constant amount of work which can be performed above rheta_F. Firstly, we investigated to clarify the physiological determinant (s) of two parameters : rheta_F and W'determining the P-t hyperbolic curve. rheta_F represented the highest attainable work rate for which a "quasi" steady state can be sustained, i.e., VO_2 and blood lactate do not continue to inctinue inexorably as they do for all supra-rheta_F work rates. The curvature constant W' has the units of work, i.e., the product of power and time, consequently, it is equivalent to a constant amount of energy above rheta_F. The W' could be considered to reflect a finite energy store such as a phosphagen pool and a glycogen content related to anaerobic glycolysis, because W' was associated with previously established indicator of anaerobic capacity : maximal O_2-deficit, and further W' was significantly reduced under glycogen depleted conditions in our experiments, while it would be premature to draw precise conclusions concerning the validity of W' as an anaerobic working capacity. Secondly, we confirmed that the P-hyperbolic relationship was also consisted in running where speed (V) is used as an analog of P.We measured two parameters : V_F and D' (instead of W') in V-t hyperbolic curve in 400m track running and the race pace performance during actual 800,1500, or 5000m distance run in sub-elite athletes. As a result, the determinates of V_F-t hyperbolic curve : V_F and D' in each runner give valuable information for a strategic race pace allocation.

已经反复证明，人类高强度运动的可容忍持续时间(t)作为功率(P)的函数以双曲线形式减少，其渐近线被称为“疲劳阈值”（rheta_F），即(P-rheta_F)*t=W‘，其中W’是曲率常数，表示可以在rheta_F以上执行的恒定工作量。首先，我们研究了确定P-t双曲曲线的两个参数rheta_F和W的生理决定因素。rheta_F代表可以维持“准”稳定状态的最高可达到的工作速率，即VO_2和血乳酸不会像所有高于rheta_F的工作速率那样无情地持续下去。曲率常数W'具有功的单位，即功率和时间的乘积，因此，它相当于rheta_F以上的恒定能量。W‘可以被认为反映了有限的能量储存，如磷池和与厌氧糖酵解相关的糖原含量，因为W’与先前建立的厌氧能力指标：最大o_2赤字相关，并且在我们的实验中，W‘在糖原耗尽的条件下显着降低，而关于W’作为厌氧工作能力的有效性得出精确的结论还为时尚早。其次，我们证实了p -双曲关系也存在于跑步中，其中速度(V)被用作p的类比。我们测量了两个参数：400米跑道跑步的V-t双曲曲线中的V_F和D'（而不是W'），以及亚精英运动员在实际800、1500或5000米长跑中的比赛配速表现。因此，每个跑步者的V_F-t双曲曲线的决定因素：V_F和D'为策略性比赛配速提供了有价值的信息。

项目成果

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Y. Fukuba 等人：“1997 年长野体育科学研讨会论文集”Cooper Publishing Group，卡梅尔，美国（印刷中），（1998 年）

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Sato, H.et al.：“最大 O_2 赤字与功率持续时间曲线的曲率常数参数之间的关系”生理学家。

Y.Fukuba et al.: "Effect of exercise-inchcced metabolic acidaemia on pulronary Vor kinetics duriy heay exercise" J.Physiol. (Lond.). (印刷中). (1998)

Y.Fukuba 等人：“运动引起的代谢性酸血症对运动期间肺 Vor 动力学的影响”J.Physiol（伦敦）（出版中）。

Miura, A.et al.: "The effect of glycogen depletion on the curvature constant parameter of the power-duration curve" Physiologist. 39(5). A-78 (1996)

Miura, A.等人：“糖原消耗对功率持续时间曲线的曲率常数参数的影响”生理学家。

Kan, A.et al.: "The velocity-duration time hyperbolic curve as an index of middle distance running performance" Physiologist. 39(5). A-78 (1996)

Kan, A.等人：“速度-持续时间双曲线作为中距离跑步表现的指标”生理学家。