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A Comparison of Vital Capacity Values with Healthy Subjects in Standing and Head-Down Positions
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Body position is known to have an effect on vital capacity(VC). The purpose ofthis study was to examine effect on VC of posture, sex and smoking, and thedifference between predicted and measured values of Vc. VC was measured in thestanding and the 30. head-down position in 40 healthy subjects (20 men and 20women) in a random order of testing. When subjects changed from standing tohead-down position, this VC decreased by 19.9%. In both positions, VC changes inmen were significantly larger than in women. No statistically significant differencewas found in men who smoked. There was no difference between the predictedand measured values in men. But measured values were larger than predictedvalues in women. Because VC can decrease by 19.9% in the head-down positiondue to the effect of gravity, attention should be paid especially to patients who areplaced in the head-down position for postural drainage since they already have adecreased VC.
Abstract
Body position is known to have an effect on vital capacity(VC). The purpose ofthis study was to examine effect on VC of posture, sex and smoking, and thedifference between predicted and measured values of Vc. VC was measured in thestanding and the 30. head-down position in 40 healthy subjects (20 men and 20women) in a random order of testing. When subjects changed from standing tohead-down position, this VC decreased by 19.9%. In both positions, VC changes inmen were significantly larger than in women. No statistically significant differencewas found in men who smoked. There was no difference between the predictedand measured values in men. But measured values were larger than predictedvalues in women. Because VC can decrease by 19.9% in the head-down positiondue to the effect of gravity, attention should be paid especially to patients who areplaced in the head-down position for postural drainage since they already have adecreased VC.