摘要：The main goal of this research was to establish the exertion of lower extremities' muscles during dynamic contractions of stepping up and down the step bench when performing the basic step at different heights of the step bench (6, 8 and 10 inches). The 8-channel measuring system (TELEMG) for measuring EMG signals enabled the monitoring of eight characteristic muscles of both right and left leg: m. rectus femoris, m. biceps (caput longum), m. gastrocnemius medialis, and m. gluteus maximus, whose activities are significant while performing the step aerobic steps. The measuring procedures included 9 examinees, long-term professional step aerobics trainers. By analyzing the basic statistics parameters of the monitored muscles calculated from the processed EMG signals, it is evident that the total energy consumption of the right leg, so-called the leading leg, is the greatest. The biggest consumption was in m. biceps femoris; then m. gastrocnemius medialis, m. gluteus maximus, and finally in m. rectus femoris. The Wilcoxon matched pairs test has proved that there are statistically significant differences in muscle contraction intensity when increasing the exertion intensity by increasing the height of the step bench.
关键词：electromyography (EMG); muscles of lower extremities; step aerobics
