Force-Control vs. Strength Training: The Effect on Gait Variability in Stroke Survivors

Area of Science:

• Neurology
• Rehabilitation Medicine
• Biomechanics

Background:

• Gait variability in stroke survivors is linked to poor dynamic balance and increased fall risk.
• Impaired movement precision and strength are key motor deficits affecting gait post-stroke.

Purpose of the Study:

• To compare the efficacy of force-control training versus strength training in reducing gait variability in chronic stroke survivors.
• To investigate the impact of these interventions on dynamic balance and fall risk.

Main Methods:

• Twenty-two chronic stroke survivors were randomized into force-control or strength training groups.
• Both groups underwent 2 weeks of unilateral, isometric ankle training (plantarflexion and dorsiflexion).
• Gait variability (stride length/time variability), gait speed, strength, accuracy, and steadiness were assessed pre- and post-training.

Main Results:

• Force-control training significantly reduced stride length and stride time variability.
• Strength training did not significantly reduce gait variability but improved ankle strength.
• Force-control training enhanced motor accuracy and steadiness, demonstrating task-specific effects.

Conclusions:

• Force-control training is more effective than strength training for reducing gait variability in chronic stroke survivors.
• Enhancing ankle force control may be a key strategy for improving gait variability and safe mobility after stroke.