Abstract
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.
Key words
postural control - aquatic exercise - lower extremity arthritis
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Correspondence
Dr. Chiho Fukusaki
The University of Tokyo
Graduate School of Frontier
Sciences
5-1-5 Kashiwanoha
Kashiwa-shi
Chiba
277-5863 Kashiwa
Japan
Telefon: +81/4/7136 4642
Fax: +81/4/7136 4642
eMail: fukusaki@k.u-tokyo.ac.jp