Background and Aim: Different aspects of the motor control parameters of dominant and non-dominant legs are investigated but the effect of dominancy on motor control strategy is still unclear. The aim of the present study is to compare the pre- motor time, motor time and reaction time in dominant and non- dominant leg muscles of the non- professional healthy athletes in response to visual stimulus during forward jumping.

Methods and Materials: Eleven non- professional healthy athletes participated in this cross-sectional study determined by convenience non probability sampling. Surface electromyography were performed in the dominant and non-dominant leg muscles including  gastrosoleous , peroneus longus, peroneus brevis, and tibialis anterior in response to visual stimulus during forward jumping.

Results: There was no significant difference (P > 0.05) between the dominant and no-dominant legs with respect to the pre-motor time, motor time and reaction time of the gastrosoleus, peroneus longus, peroneus brevis and tibialis anterior.

Conclusion: Our findings suggest that limb dominancy is not an important parameter in the motor control studies.

Keywords: Motor control strategy, Visual stimulus, Forward jumping

Background and Aim: The aim of this study was to compare the neck and temporomandibular joint range of motion and muscle endurance in patients with temporomandibular disorders, referring to the dental school of tehran university of medical science and healthy individuals.

Materials and Methods: A total of 30 healthy men as control and 30 patients aged 20-40 years with temporomandibular joint disorders (TMD) were selected as patients. Range of motion in flexion and extension of the head and neck and mouth opening was measured and masticatory muscle endurance as well as the neck extensor muscles was measured and averaged values for each patient group were compared with the control group.

Results: Head and neck flexion range of motion and endurance of neck extensor muscles in patients with temporomandibular joint disorders (TMD) was lower than healthy controls. (P<0.001)

Conclusion: The results of this study showed that disorders of temporomandibular joint can change extensor muscle endurance and range of motion in neck. Pay attention to neck problems can be effective in improving patients with disorders of temporomandibular joint.

 Keywords: Range of motion, Muscular endurance, Temporomandibular disorder