A pilot study to investigate explosive leg extensor power and walking performance after stroke.

Area of Science:

• Neurology
• Rehabilitation Medicine
• Biomechanics

Background:

• Stroke survivors often experience impaired mobility and reduced physical function.
• Leg extensor power (LEP) is crucial for walking, yet its assessment and relationship to gait post-stroke require further investigation.
• Understanding asymmetries in LEP is important for targeted rehabilitation strategies.

Purpose of the Study:

• To evaluate the test-retest reliability and performance of explosive leg extensor power (LEP) in individuals with chronic stroke.
• To examine the relationship between LEP asymmetry and gait parameters, including walking velocity, cadence, and oxygen cost.
• To determine if LEP can be reliably measured and if it correlates with walking performance after stroke.

Main Methods:

• An experimental observational design was used to recruit individuals with chronic stroke.
• Leg extensor power (LEP) was measured using standardized protocols, including Percentage Asymmetry LEP.
• Gait parameters were assessed using the GAITRite(®) system and included temporal-spatial measures and oxygen cost of walking during a four-minute walk test.

Main Results:

• Explosive leg extensor power (LEP) demonstrated good test-retest reliability (ICC [3, 1] 0.8 - 0.7).
• Significant Percentage Asymmetry in LEP was observed among participants.
• Greater LEP asymmetry strongly correlated with reduced walking velocity, cadence, stance time, and swing time on the weaker leg (p < 0.01).

Conclusions:

• Explosive leg extensor power (LEP) is a reliable and measurable outcome in individuals recovering from stroke.
• LEP asymmetry is a significant finding in this population and is directly related to impaired walking performance.
• LEP training, targeting either the stronger or weaker leg, warrants further investigation as a potential rehabilitation intervention for stroke survivors.