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Different muscle strategy during head/knee level of functional reaching-transporting task to decrease falling

Marzie Hatami1, Giti Torkaman2, Mohammad Najafi Ashtiani1

  • 1Physical Therapy Department, Faculty of Medical Sciences, Tarbiat Modares University, Ale-Ahmad Ave, P. O. Box: 1411713116, Tehran, Iran.

Archives of Physiotherapy
|May 10, 2023
PubMed
Summary
This summary is machine-generated.

Postmenopausal women with osteoporosis exhibit increased muscle activity during reaching-transporting tasks, particularly at knee level, suggesting potential instability and fall risk. This highlights the need for targeted interventions to improve balance and reduce falls in this population.

Keywords:
ElectromyographyMuscle ActivityOsteoporosis‌‌Postmenopausal WomenReaching‌Transporting

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Area of Science:

  • Biomechanics and Motor Control
  • Gerontology
  • Musculoskeletal Health

Background:

  • Reaching-transporting tasks are crucial for daily activities and impact balance control in older women.
  • Osteoporosis is a significant concern in postmenopausal women, potentially affecting mobility and fall risk.

Purpose of the Study:

  • To investigate muscle activation strategies during reaching-transporting tasks at head and knee levels in postmenopausal women with and without osteoporosis.
  • To compare muscle strength and fear of falling between these two groups.

Main Methods:

  • 24 postmenopausal women (12 osteoporosis, 12 non-osteoporosis) performed reaching-transporting tasks using a custom device.
  • Electromyography (EMG) measured muscle activity (peak root mean square - PRMS) during reaching and transporting phases.
  • Isometric muscle strength and fear of falling were assessed.

Main Results:

  • Osteoporotic women showed significantly lower isometric muscle strength than non-osteoporotic women (except vastus lateralis).
  • Increased PRMS was observed in vastus lateralis and gastrocnemius lateralis in osteoporotic women during the transporting phase.
  • Reaching-transporting at knee level elicited greater muscle activity (VL, biceps femoris) during the transporting phase compared to head level.

Conclusions:

  • Postmenopausal women with osteoporosis display heightened muscle activity during reaching-transporting tasks, especially at knee level.
  • This increased muscle activation may indicate compensatory strategies for underlying muscle weakness and insufficient stability.
  • Further research is needed to understand the link between muscle weakness, altered muscle strategies, and fall risk in osteoporotic women.