Key result
Smoking three cigarettes immediately before exercise lengthens oxygen uptake half-time by ~59% versus 24-hour abstinence.
Why the study?
Does smoking immediately before exercise retard physiological response kinetics compared to 24-hour smoking abstinence in adult smokers?
Population
10 smokers (6 female, 4 male), mean age 32 +/- 8 years.
Comparison
Smoking three cigarettes immediately before a… vs 24-hour smoking abstinence prior to a 10-min…
Design
Other, counter-balanced
Authors
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May impair oxygen uptake kinetics if smokers exercise after smoking; hypothesis-generating for pre-exercise abstinence guidance.
RCT (n=10)
counter-balanced
Does smoking immediately before exercise retard physiological response kinetics compared to 24-hour smoking abstinence in adult smokers?
Absolute Event Rate: 51% vs 32%
p-value: p=<0.01
Smoking immediately before exercise significantly delays the physiological adaptation of oxygen uptake, ventilation, and heart rate to submaximal exertion.
Rotstein et al. (1991) conducted an RCT in Smokers (n=10). Smoking vs. 24-hr smoking abstinence was evaluated on Time required for oxygen uptake (VO2) to rise from resting baseline to half of its steady-state value (t1/2) (p=<0.01). Smoking three cigarettes immediately before exercise significantly lengthened the half-time for oxygen uptake kinetics compared to 24-hour abstinence (51 vs 32 seconds, p<0.01).
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