Temporal Changes in Electromyographic Activity and Gait Ability during Extended Walking in Individuals Post-Stroke: A...

Area of Science:

• Neurology
• Biomechanics
• Rehabilitation Science

Background:

• Abnormal gait in stroke survivors often leads to neuromuscular fatigue.
• Understanding how gait and muscle activity change over time during prolonged walking is crucial for effective rehabilitation.

Purpose of the Study:

• To investigate temporal changes in gait performance and lower limb muscle activity during a 20-minute walk in individuals with stroke-induced hemiplegia.
• To compare these changes with those in healthy controls.

Main Methods:

• Twelve adults with stroke and eleven healthy controls completed a 20-minute continuous walk.
• Electromyography (EMG) amplitude and instantaneous mean frequency were measured.
• Data were analyzed at 1, 6, 12, and 18 minutes of walking.

Main Results:

• Gait performance was maintained in stroke patients throughout the 20-minute walk.
• EMG amplitude changes occurred in tibialis anterior and rectus femoris, varying by gait phase and side.
• Instantaneous mean frequency decreased over time in specific muscles and sides, unlike in healthy controls.

Conclusions:

• Stroke patients exhibit altered muscle activity patterns during prolonged walking, indicative of neuromuscular fatigue.
• Despite fatigue, walking performance is maintained, suggesting compensatory mechanisms.
• These findings highlight the complex adaptations in muscle recruitment strategies post-stroke.