Summary
The O2-uptake during running at different speed between 10 and 20 km/hour on a horizontal treadmill has been compared. A straight lined increase in O2-uptake with increasing speed was found. Determinations of O2-deficit and O2-debt showed, however, that the total energy output did not follow that line. At high speed the energy output showed a steep increase. The explanation for this is apparently that at high speed a significant part of energy has to be delivered by anaerobic processes involving low efficiency.
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References
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Christensen, E.H., Högberg, P. Steady-state, O2-deficit and O2-debt at severe work. Arbeitsphysiologie 14, 251–254 (1950). https://doi.org/10.1007/BF00933842
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DOI: https://doi.org/10.1007/BF00933842