Why the study?
Does acute hyperoxia improve heart rate, muscular strength, and muscular endurance in subjects performing resistance exercise?
Does acute hyperoxia improve heart rate, muscular strength, and muscular endurance in subjects performing resistance exercise?
Acute hyperoxia lowers resting heart rate and may improve muscular endurance during resistance exercise, but does not enhance muscular strength.
Answers are grounded in this paper and cite their sources.
Acute hyperoxia may lower resting heart rate and alter repetition capacity without improving strength; extends acute oxygen data but does not support routine use in resistance training.
The present study examined the effects of hyperoxia (HO) (>21% O2) on heart rate, muscular strength, and muscular endurance. Fifty subjects performed single-leg, isokinetic knee exercises at 60° · sec−1. Each subject took part in 3 treatments (HO [100% O2], normoxia [NO], and room air [RA] in random order, 1 week apart. Heart rates were determined by electrocardiogram. The data revealed significantly (p < 0.05) lower heart rates for the HO treatment during the resting condition. However, peak hearts rates did not differ significantly (p > 0.05) between treatments. The number of repetitions completed was significantly different (p < 0.05). Peak torque and total work did not differ significantly (p > 0.05), although total work values were greatest during HO. These preliminary data suggest that while HO can lower resting heart rate and may increase the capacity for endurance, it has little effect of muscular strength.
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Kleiner et al. (1995) studied this question.
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