Int J Sports Med 2011; 32(9): 653-658
DOI: 10.1055/s-0031-1275741
Physiology & Biochemistry

© Georg Thieme Verlag KG Stuttgart · New York

Acute Effects of Exercise on Posture in Arthritic Patients

C. Fukusaki1 , K. Masani2 , K. Nakazawa3
  • 1The University of Tokyo, Graduate School of Frontier Sciences, Kashiwa, Japan
  • 2Toronto Rehabilitation Institute, Rehabilitation Engineering Laboratory, Toronto, Canada
  • 3The University of Tokyo, Graduate School of Arts and Sciences, Tokyo, Japan
Further Information

Publication History

accepted after revision March 22, 2011

Publication Date:
12 May 2011 (online)


In this study, we aimed to investigate the acute effects of exercise on postural measures in arthritic patients. We obtained posturographic measurements of 8 women with lower extremity arthritis for 30 s before and after a 60-min aquatic exercise. The center of pressure (COP) was recorded while the volunteers were in an upright position with their eyes open. The time domain measures and the frequency domain measures of the COP time series in the anterior-posterior (AP) and medial-lateral (ML) directions were calculated. In addition, the frequency domain measures were calculated for the COP velocity time series. A paired t-test revealed no significant differences in any time domain measures between pre- and post-exercise; however, there were significant decreases in the 95% power frequency of the COP in the AP direction (0.834±0.296 to 0.627±0.230 Hz, p=0.027) for the frequency domain measures. For the velocity time series, the mean power frequency in both the AP (1.47±0.528 to 1.22±0.360 Hz, p=0.047) and ML (1.28±0.245 to 1.13±0.151 Hz, p=0.022) directions, and the 95% power frequency in the ML direction (3.41±0.653 to 2.96±0.468 Hz, p=0.038) decreased significantly in the post-exercise condition. This study reports that a single session of exercise has a subtle but detectable acute effect on postural balance in arthritic patients.


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Dr. Chiho Fukusaki

The University of Tokyo

Graduate School of Frontier


5-1-5 Kashiwanoha



277-5863 Kashiwa


Phone: +81/4/7136 4642

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