Summary
Physiological responses were measured in 7 women subjects who lifted boxes weighing 6.8, 15.9 or 22.7 kg from the floor to a height of 60 cm. After training and establishing the\(\dot V\)O2 max, the boxes were lifted for 1 h at 30, 50, and 60%\(\dot V\)O2 max. The changes in heart rate,\(\dot V\)O2, the integrated EMG during lifting and the loss of isometric hand-grip endurance after lifting were used to assess the development of fatigue. There was no evidence of fatigue at 30%\(\dot V\)O2 max but fatigue did exist in some conditions at 50% and in all conditions at 60%\(\dot V\)O2 max. It is suggested that fatigue is unlikely to occur while lifting boxes up to 15.9 kg weight at 35–40%\(\dot V\)O2 max, i.e., at rates of lifting varying from 5 to 7 times per min.
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Williams, C.A., Petrofsky, J.S. & Lind, A.R. Physiological responses of women during lifting exercise. Europ. J. Appl. Physiol. 50, 133–144 (1982). https://doi.org/10.1007/BF00952252
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DOI: https://doi.org/10.1007/BF00952252