The evaluation of forces and torques applied to the spine in different mental statuses during deadlift movements by using a low-cost video analysis package: findings from a case study

Ideal sports performance is achieved when the mental profile optimizes based on sports demands. However, there is no research has been found on the effect of mental states on the forces and torques on the athlete s body in strength movements such as deadlifts; therefore, in this case study, the researcher seeks to answer the question of whether different mental states could affect the forces and torques on the spine in the deadlift?An amateur athlete was chosen as a subject in the current study. After the warm-up and stretching exercise, the subject performed a ۱RM deadlift test for evaluating maximum muscular strength. Then ۵۰% of maximum efforts were chosen as the ultimate goal in three situations. First, the subject performed deadlift in a normal situation, second in Arousal status, which was applied by verbal encouragement and other usual methods to motivate him by coach, and last but not least, in relaxation status included in listening meditation music and relaxation massage applied for ۲۰ minutes. The video analysis (۲D in the sagittal plane) method was used via Kinovea software and marker placement on the wrist, knee, thigh, wrist, elbow, and shoulder joints. The kinematic features were analyzed by using spatial geometry methods, and kinetic analysis was evaluated via the Newton-Euler inverse dynamics method.The result indicated that the subject in relaxation status has sustained more vertical and shear stress and torque than arousal and normal situations.Although the findings indicated that relaxation status could lead to further loading compared to other moods, but research should be repeated with a higher statistical population in other to generalize these findings.

کلیدواژه ها:

Deadlift ، Inverse Dynamic ، shear force ، Spine