Why the study?
How does incremental work cycle exercise affect rib cage and abdominal motion contributions to tidal volume in healthy subjects?
How does incremental work cycle exercise affect rib cage and abdominal motion contributions to tidal volume in healthy subjects?
During incremental cycle exercise in healthy subjects, the increase in tidal volume depends more on rib cage motion than on abdominal motion.
May indicate predominant rib cage role in exercise tidal volume in health; leaves open extension to clinical populations.
We measured thoracoabdominal motion by analyzing changes of rib cage (RC) and abdomen (ABD) motion during cycle ergometry using respiratory inductive plethysmography in eight healthy subjects (8 males). Cycle exercise was performed at three incremental work rates of 60, 90, and 120w for five minutes each and tidal volume (TV) was continuously measured with a respiratory flowmeter on a breath-by-breath basis. It was found that RC motion increased, but ABD motion did not always increase, during incremental work cycle exercise RC motion contributed more to the increase of TV than ABD motion. These results suggest that TV increase was produced more by RC motion than by ABD motion.
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Tamaki et al. (2000) studied this question.
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