The effect of obesity on pulmonary function.
Wasserman-K; Bray-G; Whipp-BJ; Koyal-SN
NIOSH 1974 Jan; :1-29
Ten normal subjects and ten subjects 20-40% overweight are selected for detailed studies of pulmonary function and exercise performance on a cycle ergometer and treadmill. The results of the study demonstrate that obese subjects breath at a lower resting lung volume (FRC) than normal subjects. Thus their expiratory reserve volume tends to be significantly reduced and their inspiratory capacity elevated. During physical exercise on the cycle ergometer the obese group requires more oxygen than the normal group. This is most striking at the lowest work rate. While the oxygen consumption for the two groups is the same for treadmill work, the productive amount of treadmill work is less in the obese group as they had to do their work at a lower treadmill grade than the normal group in order to meet the same oxygen requirement. The obese subjects tend to have increased diastolic and systolic blood pressures during moderate and heavy exercise. There is no significant difference in acid-base states, lactate production, minute ventilation, tidal volume, breathing frequency, gas exchange ratio and ventilatory equivalents between the two groups for any given work rate for either cycle ergometer or treadmill work. (Contract No. HSM-99-72- 136)
NIOSH-Publication; Physical-exercise; Respiratory-system; Lung-ventilation; Respiratory-functions; Respiratory-function-tests; Lung-volume; Respiratory-gases; Oxygen-tension; Respiratory-gas-levels
Final Contract Report
National Institute for Occupational Safety and Health