Effects of Local and Global Fatigue on the Myoelectric Variables of Selected Lower Limb Muscles in Healthy Young Active Men in Single Jump-Landing Task

Since fatigue is known as a common phenomenon during exercise and it is hypothesized that it often impairs motor function and causes various injuries, the purpose of the present study was to determine the effects of local and global fatigue on the myoelectric variables of selected lower limb muscles in healthy young men active in single leg jump-landing task.

A total of 20 able-bodied healthy young males participated in the current quasi-experimental study. Wingate and Bruce tests were used to create local and global fatigue, respectively. Electrical activities of selected lower limb muscles (Gluteus Medius, Vastus lateralis, Tibialis Anterior, Peroneus Longus, Gastrocnemius and soleus muscles) were recorded using electromyography device, and Analysis of Variance (ANOVA) with repeated measures tests were used for data analysis. The significance level was set at P≥0.05.

The results showed a significant difference between the effects of local and global fatigue on the mean normalized middle serine muscle activity (P=0.046) and medial Gastrocnemius muscle midline frequency (P=0.019). However, there was no significant difference between mean and maximum normalized activity and frequency of middle serine, Vastus lateralis, anterior tibia, fibular longus, and soleus (P<0.05).

According to the findings of the present study, it seems that the effects of the types of local and global fatigue on lower limb muscle performance during single jump-landing exercise are similar.