One would assume the same inaccuracies to fall through to power. Riegel fatigue factors are specific to Kipchoge but the Riegel method has been known to sometimes over-predict and sometimes under-predict actual timings. It is understood that this is external power as distinct from internal power. ġ) Riegel factor mis-predictions : The external mechanical power results from Method 1 are constructed using time prediction Riegel formulas applied to power. m-3.kg-1) reported in the literature range from ≈ 0.012 to ≈ 0.018. When running on terrain in the absence of wind, the overall Cr out, including the energy expenditure against the air resistance is larger than that applying to treadmill running (Cr_ Tr) by an amount proportional to the square of the air velocity (which in this case is equal to the ground speed, v): This is strictly true for treadmill running in which case the energy for overcoming the air resistance is nil. The metabolic power is required to reconstitute the ATP utilised for work performance, regardless of the actual oxygen consumption which may be equal, greater, or smaller than the metabolic power itself.ĭuring constant speed running on flat compact terrain the net energy cost of running (above resting, Cr) is independent of speed and amounts on an average to 4 J/kg.m.
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