Smoking Effect on Exercise Response Kinetics of Oxygen Uptake and Related Variables

Abstract The effects of smoking on the kinetics of oxygen uptake (V̇O 2 ), carbon dioxide production (V̇O 2 ), ventilation (Ve) and heart rate (HR) in the transition from rest to steady-state submaximal exercise was investigated in 6 female and 4 male smokers (32 ± 8 yrs). The subjects underwent two...

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Bibliographic Details
Published in:International journal of sports medicine 1991-06, Vol.12 (3), p.281-284
Main Authors: Rotstein, A., Sagiv, M., Yaniv-Tamir, A., Fisher, N., Dotan, R.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Carbon Dioxide
Exercise - physiology
Exercise Test
Female
Heart Rate
Humans
Kinetics
Male
Medical sciences
Oxygen Consumption - physiology
Respiration
Smoking - physiopathology
Space life sciences
Tobacco, tobacco smoking
Toxicology
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Summary:Abstract The effects of smoking on the kinetics of oxygen uptake (V̇O 2 ), carbon dioxide production (V̇O 2 ), ventilation (Ve) and heart rate (HR) in the transition from rest to steady-state submaximal exercise was investigated in 6 female and 4 male smokers (32 ± 8 yrs). The subjects underwent two counter-balanced treadmill tests at 60% of their maximal V̇O 2 , lasting 10 min each: one following a 24-hr smoking abstinence, and one immediately after smoking three cigarettes without prior abstinence. Physiological variables were measured at rest and every 30 sec throughout each test. The time required for a given variable to rise from its respective resting baseline to half of its steady-state value (t 1/2 ) was calculated for V̇O 2 , V̇CO 2 , Ve and HR. Smoking abstinence was associated with t 1/2 values of 32 ± 8, 42± 12, 43 ± 10, and 30 ± 9 sec for V̇O 2 , V̇CO 2 , Ve, and HR, respectively. Smoking significantly (p < 0.01) lengthened those values to 51 ± 12, 58 ± 11, 54 ± 8, and 41 ± 10 sec. Concurrently, smoking raised the baseline (resting) values of HR (p < 0.01) and of Ve, V̇CO 2 , O 2 pulse (O 2 P), and both systolic and diastolic blood pressures (p < 0.05). During steady-state exercise only HR values were elevated by smoking (p < 0.01), while O 2 P values were lowered (p < 0.05). These findings indicate that smoking considerably retards physiological responses to sub-maximal exercise.
ISSN:0172-4622
1439-3964
DOI:10.1055/s-2007-1024681