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Research Article

Effects of Breathing on Multijoint Control of Center of Mass Position During Upright Stance

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Pages 241-253 | Received 09 Aug 2011, Accepted 23 Apr 2012, Published online: 06 Jun 2012
 

ABSTRACT

Breathing exerts destabilizing effects on postural stability during quiet stance. The authors conducted an experiment to evaluate the role of motor abundance in the organization of the postural synergy compensating for the effects of breathing. They measured the kinematic pattern of covariation among the major joints of the postural chain (ankle, knee, hip, trunk, and neck) as a function of different breathing modes (spontaneous, paced, and increased volume) and different stance instructions (still vs. relaxed) using the uncontrolled manifold approach. Joint variability was structured to preserve the stable position of the center of mass. This result supports the hypothesis that motor abundance of the postural chain plays an important role in the flexible compensation for breathing during quiet stance.

ACKNOWLEDGMENTS

This study was supported by NSF grants BCS-0926662 and BCS-0728743. We would like to thank Caravella McCuistian for help with data collection.

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