The purpose was to compare the EMG activation level in specific strength training exercises used by orienteers with the activation level in generic strength exercises and MVDA (maximum voluntary dynamic action) in order to evaluate possible strength training potential in the specific exercises. In total six male regional to national level elite orienteers participated in the study. Mean (range), height and weight were 25 (19-32) years, 180 (1.74-1.88) m and 71 (67-75)kg. The electrical activity in m. gluteus maximus (GM), m. rectus femoris (RF), m. vastus lateralis (VL) and m. soleus (SOL) of the right leg was recorded with bipolar surface electrodes. The EMG data was recorded at 1000 Hz with a portable data logger. The participants performed the following generic strength exercises: 5RM (repetition maximum) squats and 5RM ankle extensions on the right leg. In addition MVDA in form of 5 consecutive maximal vertical jumps were performed on the right leg and with both legs. The participants performed the following specific exercises: leaping i.e. running with very long strides and maximal effort on a horizontal gravel stone road and uphill in forest terrain. Both generic (squats and ankle extensions) and specific strength training exercises (leaping on the horizontal and uphill) reached sufficiently high relative EMG levels. The results also show that the activation levels during the specific strength exercises are compatible with the 5RM generic exercises commonly used to increase muscle strength.
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