The neural adjustment of postural response through community-based daily exercises in elderly persons.
BACKGROUND
Reflecting the rapidly aging population, community-based interventions in the form of physical exercise have been introduced to promote the health of elderly persons and prevent falls. Postural response is the critical neural response for preventing falls. The objective of this study was to assess the effect of long-term daily exercise on neural adjustment in postural response elucidated by sudden postural perturbation.


METHODS
Twenty-six community-based elderly persons (13 men and women; 69.8+/-0.5 years old) participated in this study. Daily exercise was composed of walking for longer than 30 min, stretching, muscle strengthening and balance exercise, and was continued for 3 months. Postural responses were induced by fore or aft horizontal displacement of a platform with a force plate. Center of pressure on the force plate and electromyography of the rectus femoris, tibia anterior, biceps femoris and gastrocnemius were measured in postural response.


RESULTS
Following the 3 months of physical intervention, the amplitude and timing of the center of pressure excursion did not change, whereas the amplitude of muscular activities of the lower leg muscles required for the response significantly decreased. Furthermore, the onset of muscular activation of the lower leg muscles was significantly shortened following the intervention.


CONCLUSIONS
In conclusion, we showed that a program composed of 3 months of comprehensive exercise modulated the output of the postural response through a neural adjustment in the timing and amplitude of the muscular activation.
Maejima
Hiroshi
H
Graduate School of Health Sciences Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima 734-8551, Japan. maeji@hiroshima-u.ac.jp
Sunahori
Hitoshi
H
Kanetada
Yuji
Y
Murase
Azusa
A
Tobimatsu
Yoshiko
Y
Otani
Takuya
T
Yoshimura
Osamu
O
D000368:Aged; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D007866:Leg / Q000294:innervation / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000294:innervation* / Q000502:physiology*; D009473:Neuronal Plasticity / Q000502:physiology*; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D012018:Reflex / Q000502:physiology*