b) What is the relationship between height and COPD sitting posture vital capacity? The taller you are the more COPD sitting posture vital capacity. o c) Explain why there is a difference—which one is more accurate in measuring the vital capacity? Why? The COPD sitting position is more accurate since it flattens the diaphragm, allowing more air to come in. pg. 3
Vital capacity is defined as the amount of air that can be forcibly exhaled after a deep inspiration. The lung volume increases in a taller person due to increased thorax size and increased lung size. Lung volumes and lung capacity are different definitions of the respiratory cycle.
This clear relationship between standing height and vital capacity has been taken as scientific fact since that time despite inconsistencies not only in Hutchinson’s data but in almost all population studies since that time. The problem is that the relationship between standing height and vital capacity is not precise but only approximate.
Kelly," in a study of vital capacity of boys and girls, first identified the relationship between vital capacity and the cube of height. Bate man" later expressed the relationship of the total lung volume and its subdivisions to the third power of the body height of adults of average stature.
Measurements of vital capacity and total lung capacity were made on healthy men of heights up to 206 cm. (81 inches), extending previous measurements on boys and men of average height. In the range between 120 and 206 cm. of height, lung volumes are closely related to the third power of height, as shown by others. The prediction formula of Bateman, relating volume to the cube of height, is ...
Measurements of vital capacity and total lung capacity were made on healthy men of heights up to 206 cm. (81 inches), extending previous measurements on boys and men of average height. In the range between 120 and 206 cm. of height, lung volumes are closely related to the third power of height, as shown by others.
Some factors affecting vital capacity are pregnancy, sex, age, physical fitness, muscle mass, elevation and disease, according to Boundless. Some factors like pregnancy and disease can decrease vital capacity, and others like physical fitness and muscle mass can increase it.
The addition of sitting height did not improve separate race/ethnic equations that contained standing height. However, sitting height includes only one dimension of thoracic size, and the similar predicted FEV 1 /FVC ratio among whites, African Americans, and Mexican Americans suggests that there are proportional differences related to frame size.
There is less predictability between age and vital capacity vs. height and vital capacity because two people could be the same height at different ages. g) What effect does posture have on vital capacity? Why? A slouched posture will increase the vital capacity, because it will move the diaphragm down, allowing more air to enter. h) What is the relationship between vital capacity and tidal volume?
The results of the measurement of residual volume, functional residual capacity, vital capacity, and total lung capacity in 171 persons between the ages of 5 and 38 years have been reported together with regression equations based on height. The lung volumes correlated well with the cube of height.