Strength Training for Skeletal Muscle Endurance after Stroke

Area of Science:

• Rehabilitation Medicine
• Neurology
• Exercise Physiology

Background:

• Strength training (ST) is recognized as safe and effective post-stroke.
• Previous research demonstrated ST's positive effects on muscle volume and strength.
• The impact of ST on skeletal muscle endurance (SME) post-stroke remained under investigation.

Purpose of the Study:

• To investigate the effects of a unique, higher-intensity ST model on SME in stroke survivors.
• To quantify ST-induced adaptations in the capacity to sustain isotonic muscle contractions.

Main Methods:

• Hemiparetic stroke participants were randomized into ST or stretch control (SC) groups.
• The ST group trained to muscle failure (3x/week for 3 months) using pneumatic resistance machines.
• Primary outcome: SME (submaximal weight leg press repetitions); Secondary outcomes: maximum strength, 6-minute walk distance (6MWD), walk speeds, and peak aerobic capacity (VO2 peak).

Main Results:

• ST participants showed significantly greater SME gains in both paretic (178%) and non-paretic (161%) legs compared to SC (12%).
• Significant improvements were observed in 6MWD and VO2 peak in the ST group.
• The ST regimen demonstrated large effect sizes for enhancing muscle endurance post-stroke.

Conclusions:

• The implemented ST regimen significantly enhances the capacity for sustained submaximal muscle contraction in stroke survivors.
• Improved skeletal muscle endurance may hold greater practical relevance for functional recovery post-stroke than maximum strength.
• This study highlights the potential of targeted strength training for improving functional capacity after stroke.