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Weight Loss in Obese Men
Weight Loss Not Aerobic Exercise Improves Pulmonary Function in Obese Men
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Weight Loss, Not Aerobic Exercise, Improves Pulmonary Function in Older Obese Men

Weight Loss Study Aim
The effect of weight loss or aerobic exercise (AEX) on pulmonary function in middle-aged and older (46-80 years) obese, sedentary men to determine the effect of reductions in body weight and increases in cardiorespiratory fitness on pulmonary function was studied.

Weight Loss Study Results
The 35 subjects who completed the weight loss study decreased weight by 11 percent, body fat percentage by 21 percent, waist circumference by 8 percent, waist-hip ratio by 2 percent, and fat-free mass by 3 percent. This resulted in a 3 percent increase in forced vital capacity (FVC), a 5 percent increase in total lung capacity, an 18 percent increase in functional residual capacity, and an 8 percent increase in residual volume, with no change in forced expiratory volume in one second (FEV1), FEV1/FVC ratio, or carbon monoxide diffusing capacity. The change in FVC correlated with change in body weight. The 38 subjects who completed AEX increased V.O2max by 14 percent, with no change in pulmonary function. There were no changes in 8 control subjects.

Weight Loss Study Conclusion
Weight loss changes static lung volumes, not dynamic pulmonary function, in middle-aged and older, moderately obese, sedentary men. Some of the alterations in static lung function associated with aging may be due to the development of obesity and are modifiable by weight loss.

Source: The Gerontological Society of America.

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