Fig. 4From: Age-related changes in the activation timing of postural muscles to the prime mover muscle for bilateral arm flexion during standingAge-related changes in the proportion of preceding and delayed burst activations. YA, young adults. Asterisks indicate a significant number of subjects relative to the expected frequency. *p < 0.05. The value over the bar graph is the number of subjects that showed burst activation in each age groupBack to article page