Our results further showed that the coactivations of agonist and antagonist muscles during the post-impact 30-ms phase were increased with increasing rebound height. Our results clearly showed that the pre-activation of the antagonist TA was increased with increasing rebound height. Notice where your foot isthe height of the box you use should be below that level. From a standing position, bend one knee and raise it in front of you until your thigh is parallel to the floor. Ankle and knee joint angles, and vertical ground reaction force together with an electromyogram of the lower leg muscles (medial gastrocnemius, soleus and tibialis anterior ) were measured simultaneously during DJ. The box jump develops power similar to the tuck jump, but is safer and less demanding.
The subjects performed DJs with two drop heights (0.2 and 0.4 m) and three different efforts (maximal rebound height, 50% effort of maximal rebound height and landing without rebound). Place the hands on the floor while shifting the weight backward and. Place the hands on a stability ball, shifting to an unstable, incline position. Jump straight up, lifting knees to touch.
Bend knees slightly and extend arms out at shoulder height, elbows bent and wide, palms facing floor. Place the hands on an elevated, stable surface while keeping the hips straight. Start in standing position with feet hip-width apart. The purpose of the present study was to examine the regulation of agonist-antagonist muscle activation during DJ with different drop and rebound heights. Place the feet on an elevated surface and the hands on the floor, shifting to a declined position. It is still not clear how the antagonist muscles function when the drop and rebound intensities are varied during drop jump (DJ) exercises. Pre-programmed and stretch-induced muscle activities of agonist muscles can play important roles during stretch-shortening cycle exercises.