Background:The dynamic valgus is a movement disorder that affects athletes of volleyball. Changes in lower limb kinematics during jumps can compromise the performance. These changes
are the result of the weakness of muscles of the pelvis, particularly hip external rotator muscles. A technique that could contribute to correcting the dynamic valgus is the elastic tape, which aims
to increase muscle activity through exteroceptive stimulusObjetive to evaluate the effect of elastic bandage on variables related to strength in individuals with dynamic valgus.
Methods:Athletes attended the screening process that consisted in 3 drop jumps from the top of a box of 31 cm, while a previously trained evaluator classified them with 0 being the
absence of medial deviation, 1 light medial deviation and 2 high medial deviation of one or both knees. Eight young volleyball athletes (5 with dinamic valgus and 3 controls) aged 14 to 17 were tested
on an isokinetic dynamometerto evaluate the peak torque of external rotators of the hip. After familiarization, they performed 5 repetitions of eccentric contractions at 60°/s. Four tests were done:
without bandage, with a placebo model, with mechanical model and with an activation model of the gluteus maximums. Application was randomized and athletes were blinded to the purpose of each bandage
Results:: Preliminary results of individuals with the best and worst values for the control group and the experimental group following the order described above: Control group with
higher values: (N-M) 204,30 right leg(RL) and 202,10 left leg(LL), 153,2 RL 165,8 and LL 124,6 RL and 150,2 LL, 219,2 RL and 232,6 LL. and 538,7 LL, 279,5 RL and 363,6 LL, 152,1 RL and 231,5 LL, 308,2
RL and 327,4 LL. Control group with lower values: 111,10 RL and 73,90 LL, 198,9 RL and 137,4 LL, 140 RL and 121,7 LL, 139,1 RL and 145,9 LL. LL. Experimental group with higher values: 97,90 RL and
73,80 LL, 107,1 RL and 89,4 LL, 78,9 RL and 79,4 LL, 98 RL and 97,9 LL. Experimental group with lower values: 68,10 RL and 63,90 LL, 76,1 RL and 79,4 LL, 89,1 RL and 55,6 LL, 52,3 RL and 48,2 LL.
Conclusions:There is a trend that athletes with dynamic valgus showed lower torque peak values than the athletes without dynamic valgus. The bandages do not seem to have effect on
peak torque, this could be due to the fact that the bandage does not propose to increase strength but muscle activation.