其他摘要：Smoking habits can cause physiological and metabolic changes in human body systems. The tobacco affects the physical capability in exercise when the inhaled carbon monoxide binds to red blood cells and his effect on sports performance and aerobic power are not clearly defined. This study aim to compare the influence of smoking habits in ventilatory lung function and in aerobic power in physically active people. Twenty voluntary normotensive physically active men (sports 3 to 5 times per week) participated in the study. The smoker group comprised nine subjects (age mean=21.4, s=3.2 years; weight mean=71.9, s= 8.0 Kg; height mean= 176.2, s=7.7 cm; fat mass mean= 5, s= 1.3%; rest heart rate mean= 62, s=10 bpm) and the non-smoker group comprised ten subjects (age mean=22.0, s=3.5 years; weight mean=73, s= 8.4 Kg; height mean=178, s= 5.7 cm; fat mass mean 4, s=1.2%; rest heart rate mean= 61, s=6 bpm). The maximum voluntary ventilation (MVV), forced vital capacity (FVC) and forced expiratory volume (FEV1) were measured by MicroQuarck (Cosmed®) and the aerobic power by Astrand-Ryhming nomogram. The results for FVC and FEV1 between groups were not different (p>0.05). In the smokers group FEV1 were (FEV1 mean=4.5, s=0.3 L/min) as in the non-smokers group were (FEV1 mean=4.3, s=0.4 L/min). Possible causes for this results may be due to the high level of smokers in sports participation, the low number of cigarettes per day (mean of cigarettes=7, s=6 cigarrettes per day) or the number of individuals involved in this study. The MVV was different (p<0.05) between groups, smokers (MVV mean=172.7, s=19.9 L/min) and non-smokers (MVV mean=174.1, s=19.1 L/min), the non-smokers have higher values compared to smokers as expected. The analysis of the results for the aerobic power between groups, is also in line with the expected, aerobic power of the group of smokers (VO2máx. mean=40.9, s=6.5 ml/kg/min) is lower than the group of non-smokers (VO2máx. mean=46.8, s=9.4 ml/kg/min). From these data we suggest that tobacco consumption in physically active individuals do not produces airways obstruction but probably decrease the aerobic power values.
