Anticipatory Electromyographic Activity and Onset Time in Selected Muscles of Lower Limb between Active and Inactive Old Aged Women

Document Type : Research Paper


1 Department of corrective exercise & Sport injury, Faculty of physical education and sport sciences, Allameh Tabataba'i University, Tehran, Iran.

2 دانشگاه علامه طباطبائی


Introduction: The study aimed to investigate the onset time and the electromyographic activity level of the selected lower limbs muscles in active and inactive aged women.
Methods: in this case-control study, 28 aged women with a mean age of 61.07±0.88 were selected in two groups of inactive (15 people) and active (13 people). The electrical activity of the selected muscles of the lower limbs was collected by the EMG device in a stair down movement.
Results: the onset time of tibialis anterior, vastus lateralis and biceps femoris muscles is faster in the active group (p <0.05). In addition, the activity level of the rectus femoris muscle in the interval of 100 ms before the initial contact and the ratio of the vastus medialis muscle to the biceps femoris muscle was significantly lower (p <0.05) in active group.
Conclusion: the muscles of the lower limbs in the group of women with regular physical activity are activated faster than the inactive group and the decrease in the activity of the Rectus femoris muscle and the ratio of the vastus medialis to the biceps femoris muscle in active women may be accompanied by fatigue and reduced intra-articular forces.