Effect of velocity on shoulder muscle recruitment patterns during wheelchair propulsion in nondisabled individuals: Pilot study

Abstract

Abstract-This study investigated how the recruitment patterns of shoulder muscles were influenced by wheelchair propulsion speed. Electromyography (EMG) activity of seven muscles was recorded with surface electrodes on 15 nondisabled subjects during wheelchair propulsion on a stationary ergometer. Kinetic data were measured by a SmartWheel. EMG total intensities were calculated to describe the muscle activation level, while the angles formed by first principal component and second principal component loading scores were calculated to describe the spectral content of EMG signals. Significant differences were observed in kinetic variables between the two testing speeds (p < 0.05). The EMG intensity of the tested muscles increased significantly with increased speed (p < 0.05). The push muscles showed a longer EMG duration, whereas the recovery muscles exhibited significantly earlier EMG onset and peak activities at the fast speed. The smaller angle values in the fast propulsion speed indicated that faster motor units were recruited to match the mechanical requirement for the faster motion. Pushing a manual wheelchair at a faster speed not only requires a higher level of propulsive muscle activity but also a higher level of recovery muscle activation.

Sprint performance and force application of tennis players during manual wheelchair propulsion with and without holding a tennis racket

“…These results were obtained under maximal test conditions. However, Qi et al [30] have shown that velocity influences temporal and kinetic parameters. Thus, inducing variations in these parameters for higher velocity [30].…”

“…However, Qi et al [30] have shown that velocity influences temporal and kinetic parameters. Thus, inducing variations in these parameters for higher velocity [30]. We can assume that our results obtained in maximal tests would be different in submaximal tests.…”

Análise biomecânica em usuários de cadeiras de rodas durante a fase inicial da autopropulsão.

“…Possivelmente, os atletas em cadeira de rodas foram capazes de aumentar sua velocidade de movimento à medida que a tarefa se tornou mais rápida, a fim de executá-la corretamente (SANTOS et al, 2014). Este estudo corrobora as características desta amostra, visto que todos já tiveram contato com a prática esportiva (BONINGER et al, 2002;QI et al, 2012).…”

Análise eletromiográfica da fase inicial da autopropulsão de cadeira de rodas manual

“…e Gagnon et al(2015) sincronizaramos dados eletromiográficos com a aquisição de dados cinemáticos. JáMulroy et al (2004),Qi et al (2012) eYang et al (2006), utilizaram-se de sincronização com a aquisição de dados cinéticos. Outros estudos envolvendo eletromiografia e propulsão da cadeira de rodas que não necessitaram de outra metodologia como suporte, não tiveram a necessidade de definir-se início e fim do ciclo de propulsão como no experimentode Harburn e Spaulding (1986).Considerações feitas, os resultados apresentados nas Figuras 18 à 25 fornecem informações a partir de uma análise exploratória do comportamento eletromiográfico durante o curso do gesto de propulsão.…”