OPTIMIZING UPPER LIMB REHABILITATION IN SPINAL CORD INJURY: EFFICACY OF LOW-INTENSITY BLOOD FLOW RESTRICTION TRAINING

Individuals with incomplete spinal cord injury (SCI) frequently experience upper extremity muscle atrophy and weakness, limiting their independence and ability to perform activities of daily living. High-intensity resistance exercise (60–80% of one-repetition maximum, or 1RM) is typically the most effective way to enhance muscle strength and hypertrophy. However, many SCI patients cannot safely tolerate high-intensity training and are at heightened risk of upper limb overuse injuries. A promising alternative commonly used by high-performance athletes is blood flow restriction (BFR) training. BFR enables significant muscle strength and size gains at lower loads (20–40% of 1RM), reducing the risk of overuse injuries. This study evaluated the effects of an eight-week low-intensity BFR (LI-BFR) exercise program on forearm muscle strength and function in individuals with incomplete SCI. Ten adults with chronic cervical or thoracic SCI (male and female) participated in an 8-week LI-BFR exercise program targeting forearm muscles, with each participant's contralateral forearm serving as a control. Grip strength was the primary outcome measure, and participants provided qualitative feedback on their experiences with the intervention. Forearm muscle strength significantly increased on the experimental side subjected to LI-BFR training, with an average improvement of 7.5 ± 0.36 kg after 16 exercise sessions (Cohen's d = −6.32, 95% CI: −8.34, −6.68). In contrast, the control side, which underwent traditional high-intensity training without BFR, showed a smaller strength gain of 4.4 ± 0.67 kg. Participants reported notable improvements in their ability to perform daily tasks, with a mean Patient's Global Impression of Change (PGIC) score of 2.2, reflecting meaningful perceived enhancements in health and functionality. This study demonstrates the feasibility and effectiveness of low-intensity blood flow restriction exercise as a safe and promising approach for enhancing forearm muscle strength in individuals with spinal cord injury. The observed improvements in muscle strength, coupled with high levels of participant satisfaction, highlight the potential of LI-BFR as an innovative and accessible method that could significantly improve functional independence for people with SCI. Beyond SCI, LI-BFR training offers substantial benefits for orthopedic patients recovering from surgery, fractures, or joint replacements. LI-BFR training could provide a low-load, low-risk means of stimulating muscle hypertrophy and strength, thereby accelerating recovery timelines without imposing undue strain on healing tissues. Additionally, LI-BFR may be highly valuable in prehabilitation contexts, where building strength before surgery could lead to better postoperative outcomes. Furthermore, the adaptability of LI-BFR makes it suitable for a variety of high-risk populations who are typically contraindicated for high-intensity resistance exercise, including elderly individuals with osteoporosis, patients with chronic conditions like osteoarthritis or cardiovascular disease, and those at risk of musculoskeletal injuries due to overuse. For these individuals, LI-BFR offers a safer, scalable method to maintain or improve muscle function and mobility, potentially reducing the risk of further injury and enhancing overall quality of life.