The Influence of Laterality during Gait Cycle on Manual Pushing (original) (raw)

대한인간공학회 학술대회논문집, 2014

Abstract

The objective of this study was to investigate the influence of laterality in various speeds of gait cycle on manual pushing which has been given less attention. The participants of this study were 17 healthy males, 6 of them were left-handers. They performed trials by pushing a wall force plate during walking on a treadmill in three speeds: 1.5, 3, and 4 km/h. The participants were instructed to push at no less than 50% of their maximum static pushing force. Electromyogram (EMG) data was collected bilaterally from tibialis anterior, soleus, lumbar erector spinae and triceps brachii muscles. Time series analysis was normalized into gait cycle which was described as time between heel strike and just before the next heel strike of the same foot and it consisted of 100 data points. To show symmetry, cross-correlation function analysis from the left and right gait cycle variables were compared. Asymmetrical gait cycle period was only observed among right-handers at 3 km/h speed where right gait cycle had longer time than left gait cycle. Pushing force symmetry index was not changed in all of the three speeds in both right-handers and left-handers. Pushing force exertion showed asymmetry in between left and right gait cycle in 4 km/h pushing. The activation pattern of tibialis anterior, soleus and lumbar erector spinae muscles did not show any significant change due to different speeds of manual pushing. However, triceps brachii showed differences due to speeds among left-handers. The better understanding of laterality on manual pushing will help in not only better design of manual pushing tools and tasks but also on its application beyond manual materials handling.

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