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Slowness to develop force contributes to weakness after stroke

C G Canning1, L Ada, N O'Dwyer

  • 1School of Physiotherapy, Faculty of Health Sciences, The University of Sydney, Lidcombe, NSW, Australia.

Archives of Physical Medicine and Rehabilitation
|January 23, 1999
PubMed
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Stroke survivors experience significant muscle weakness, with impaired torque generation rate and peak torque. Recovery shows improvement by 25 weeks, but slow force development remains a challenge.

Area of Science:

  • Neurology
  • Rehabilitation Medicine
  • Biomechanics

Background:

  • Stroke frequently leads to motor deficits, including muscle weakness.
  • Quantifying muscle strength and the speed of force production is crucial for understanding functional recovery after stroke.

Purpose of the Study:

  • To investigate muscle weakness in stroke survivors, focusing on both the maximal force (peak torque) and the rate of torque development.
  • To compare torque generation in stroke patients with age-matched healthy controls at different time points post-stroke.

Main Methods:

  • A descriptive study design was employed.
  • Ten stroke patients and ten healthy controls were assessed.
  • Peak isometric elbow flexor/extensor torque and the time to reach 90% of peak torque were measured at 6 and 25 weeks post-stroke.

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Main Results:

  • At 6 weeks post-stroke, patients exhibited approximately 50% of the strength of controls and required 2-3 times longer to generate peak torque.
  • By 25 weeks, significant improvements were observed in peak torque and the rate of torque development, with values approaching normal ranges.

Conclusions:

  • Reduced peak torque and a slower rate of torque development are key impairments following stroke.
  • These deficits have significant implications for functional recovery, particularly in tasks requiring rapid or forceful muscle contractions.