Postural movement during bilateral arm flexion and deformity of lumbar vertebral bodies related to chronic low back pain in elderly women

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  • Ai Juan
    Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University
  • Fujiwara Katsuo
    Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University
  • Asai Hitoshi
    Division of Health Sciences, Graduate School of Medical Science, Kanazawa University
  • Koshida Kichiro
    Division of Health Sciences, Graduate School of Medical Science, Kanazawa University
  • Tomita Katsuro
    Department of Orthopedic Surgery, Graduate School of Medical Science, Kanazawa University
  • Kawahara Norio
    Department of Orthopedic Surgery, Graduate School of Medical Science, Kanazawa University
  • Tomita Hidehito
    Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University

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<p>  We investigated postural movement and muscle activation patterns during bilateral arm flexion for elderly women, and differences with postural movement pattern in the deformity of lumbar vertebral bodies and incidence of chronic low back pain. Subjects comprised 50 elderly women living without assistance in a farming community. Based on sagittal video imaging recorded at a frame rate of 60 Hz, constant movement angles of foot-leg and leg-trunk during arm flexion were analyzed. Activation timing of postural muscles with respect to burst onset of the anterior deltoid (AD) was identified by analyzing electromyographic activity. Lateral radiography during quiet standing was taken to calculate the ratio of anterior to posterior height of each lumbar vertebral body. Correlation between the two movement angles in the elderly was markedly lower than in young adults, with the constant movement angle of foot-leg being small. Regardless of individual differences in postural movement pattern, the erector spinae activated in advance of the AD, whereas biceps femoris and gastrocnemius did not. Ratios of anterior to posterior height at the L1 and L5 vertebral bodies were significantly lower for subjects with postural movement pattern where the hip joint flexed than for subjects with postural movement pattern where the hip joint extended, and incidence of chronic low back pain was also significantly higher. These results suggest that in elderly women, the target of postural control is focused on the trunk, and that postural movement pattern influences the deformity of lumbar vertebral bodies and the incidence of chronic low back pain.</p>

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