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Changes in Muscle Activity and Kinetics Related to Fatigue Progression in Wheelchair Propulsion

This study investigates how fatigue impacts muscle balance during wheelchair propulsion at different speeds. Findings show significant differences in muscle activity and kinetics, with implications for injury prevention strategies for manual wheelchair users (MWUs).

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Changes in Muscle Activity and Kinetics Related to Fatigue Progression in Wheelchair Propulsion

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  1. Changes in surface electromyography signals and kinetics associated with progression of fatigue at two speeds during wheelchair propulsion Liping Qi, PhD; James Wakeling, PhD; Simon Grange, PhD FRCS(Tr&Orth); Martin Ferguson-Pell, PhD

  2. Study Aim • See whether fatigue influences muscle balance in a recordable way. • Create novel defensive activity strategies for manual wheelchair users (MWUs). • Relevance • Study demonstrates how kinetic and electromyographic (EMG) information might provide basis for feedback to MWUs to help them conduct activity in ways that do not precipitate injury.

  3. Methods • Studied wheelchair propulsion to mild fatigue (“15” on Ratings of Perceived Exertion scale) at 2 speeds: • Slow (0.9 m/s). • Fast (1.6 m/s). • Recorded surface electromyographic activity of 7 muscles in 14 nondisabled participants. • Measured kinetic variables using a SmartWheel.

  4. Results • For the 2 speeds: • Significant difference between: • Peak total force. • Peak tangential force. • Average total force. • Average tangential force. • Push time. • Push frequency. • No significant effect of percent endurance time on these kinetic variables. • Shoulder muscle activity increased significantly. • But no significant effect of percent endurance time on EMG duration for any muscle. • EMG duration significantly differed between the 2 speeds. • Shows muscle activity differed significantly at different speed.

  5. Results EMG intensity at 20% (black lines) and 100% endurance time windows (gray lines). Time 0 = hands on pushrim. Each profile represents mean (thick line) ± standard error of mean (thin lines) obtained from averaging individual data across 10 consecutive propulsion cycles of each time window. AD = anterior deltoid, MD = middle deltoid, PD = posterior deltoid, PM = pectoralis major, BB = biceps brachii, TB = triceps brachii, UT = upper trapezius

  6. Conclusions • During faster speed, activities of propulsive muscles and recovery muscles increased, but propulsive muscles increased more. • Could imply muscle imbalance due to prolonged wheelchair propulsion. • Ability to measure fatigue rate and muscle recruitment pattern can: • Enhance understanding of shoulder muscle function. • Provide tool for fatigue assessment and imbalance evaluation.

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