# Physiological Responses Of Women During Lifting Exercise

Carole A. Williams, Jerrold Scott Petrofsky, Alexander Lind
Published 1982 · Medicine
SummaryPhysiological 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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