Comparison of Electromyographic Activity and onset time of Selected of Lower Limb Muscles in Active and Inactive old Women

In the elderly, the appropriate retrieval pattern and timing of the lower limb muscles change. This study aimed to investigate and comparison the the electromyographic activity and onset time of the selected lower limb muscles in the active and inactive old women.In this case-control study, ۲۸ old women with a Mean±SD age of ۶۱.۰۷±۰.۸۸ years were selected in the inactive (۱۵ people) and active (۱۳ people) groups by purposive and convenience sampling method. The electrical activity of the selected muscles of the lower limbs was collected by the EMG device in a stair (۲۰ cm) down movement. The data were analyzed using statistical methods and independent t-test and at the significance level of α≤۰.۰۵.. In addition, using Lab View software, the average resting time activity of each muscle was calculated. When the muscle activity of the two standard deviations exceeds the average resting time activity and lasts for ۰.۰۲۵ s, it is considered as the onset time of muscle activityThe onset time of tibialis anterior (P = ۰.۰۰۳), vastus lateralis (P = ۰.۰۰۱) , and biceps femoris (P = ۰.۰۰۶) muscles are faster in the active group (p <۰.۰۵).It seems that the muscles of the lower limbs in the group of women with regular physical activity are activated faster than the inactive group. Delay in the onset of postural muscle activity also appears to play a role in balance and motor control. Therefore, it is recommended that old women participate in regular and active exercise programs to improve their pattern muscle activity and onset times.

کلیدواژه ها:

electromyography ، Aged ، Exercise ، Muscles