Combined Blood Flow Restriction and Robot-Assisted Training for Post-Stroke Upper Limb Recovery

Overview

This randomized controlled trial protocol investigates the efficacy of combining blood flow restriction therapy (BFRT) with robot-assisted therapy (RAT) to improve upper limb motor function in stroke survivors. The study will compare four intervention groups over four weeks, assessing motor performance, strength, and functional outcomes.

Background

Upper limb motor dysfunction is a common and disabling consequence of stroke, significantly impairing autonomy and quality of life. Traditional high-load resistance training is effective for muscle strength but often not feasible for stroke survivors due to comorbidities and deconditioning. BFRT offers a low-load alternative that can induce muscle hypertrophy and strength gains by partially restricting blood flow during exercise. Emerging evidence suggests BFRT may also enhance neuroplasticity and cortical activation, potentially improving motor recovery when combined with task-specific therapies like RAT.

Data Highlights

The trial will enroll 100 participants randomized into four groups: (A) UL-RAT + BFRT, (B) UL-RAT + sham BFRT, (C) BFRT + traditional occupational therapy, and (D) traditional occupational therapy alone. Interventions will be delivered once daily, five days per week, for four weeks. Outcome measures include the Fugl–Meyer Assessment, Motricity Index–Upper Limb, grip strength, surface electromyography, Action Research Arm Test, and Modified Barthel Index, evaluated at baseline and post-intervention. Statistical significance is set at p < 0.05.

Key Findings

• Upper limb motor dysfunction post-stroke severely limits functional independence.
• BFRT enables low-load training to achieve muscle strength gains comparable to high-load resistance training.
• BFRT may enhance cortical activation and neuroplasticity, supporting motor relearning.
• Combining BFRT with RAT could synergistically improve upper limb motor recovery by integrating peripheral muscle strengthening with task-specific neural retraining.
• Current evidence on BFRT for upper limb rehabilitation post-stroke is limited, highlighting the need for rigorous trials.
• This study will provide important data on the feasibility and efficacy of BFRT combined with RAT in stroke rehabilitation.

Clinical Implications

If effective, integrating BFRT with robot-assisted therapy could offer a practical, low-load rehabilitation strategy to enhance upper limb motor recovery in stroke survivors who cannot tolerate high-intensity training. This combined approach may optimize both muscular and neural mechanisms underlying motor function, potentially improving patient outcomes and independence.

Conclusion

This trial will evaluate the potential benefits of combining blood flow restriction therapy with robot-assisted training for upper limb rehabilitation after stroke, addressing a critical gap in current neurorehabilitation strategies.

References

1. ChiCTR2500096611 -- Clinical Trial Registration