Muscle oxygenation during hybrid arm and functional electrical stimulation-evoked leg cycling after spinal cord injury

• Published in: Medicine (Baltimore) Vol. 97; no. 43; p. e12922
• Main Authors: Hasnan, Nazirah, Mohamad Saadon, Nurul Salwani, Hamzaid, Nur Azah, Teoh, Mira Xiao-Hui, Ahmadi, Sirous, Davis, Glen M
• Format: Journal Article
• Language: English
• Published: United States Wolters Kluwer Health 01.10.2018
• Subjects: Adult; Arm - blood supply; Arm - physiology; Electric Stimulation Therapy - methods; Exercise - physiology; Exercise Test - methods; Humans; Leg - blood supply; Leg - physiology; Lower Extremity - physiopathology; Male; Muscles - metabolism; Observational Study; Oxygen Consumption - physiology; Spectroscopy, Near-Infrared - methods; Spinal Cord Injuries - physiopathology; Spinal Cord Injuries - rehabilitation
• ISSN: 0025-7974; 1536-5964
• DOI: 10.1097/MD.0000000000012922

This study compared muscle oxygenation (StO2) during arm cranking (ACE), functional electrical stimulation-evoked leg cycling (FES-LCE), and hybrid (ACE+FES-LCE) exercise in spinal cord injury individuals. Eight subjects with C7-T12 lesions performed exercises at 3 submaximal intensities. StO2 was measured during rest and exercise at 40%, 60%, and 80% of subjects' oxygen uptake (VO2) peak using near-infrared spectroscopy. StO2 of ACE showed a decrease whereas in ACE+FES-LCE, the arm muscles demonstrated increasing StO2 from rest in all of VO2) peak respectively. StO2 of FES-LCE displayed a decrease at 40% VO2 peak and steady increase for 60% and 80%, whereas ACE+FES-LCE revealed a steady increase from rest at all VO2 peak. ACE+FES-LCE elicited greater StO2 in both limbs which suggested that during this exercise, upper- and lower-limb muscles have higher blood flow and improved oxygenation compared to ACE or FES-LCE performed alone.