The kinetics and kinematic properties of the trunk during the bar twist exercise with bars of increased length or mass

This study aimed to elucidate the kinetic and kinematic properties of the trunk motion while performing the bar twist exercise. The increasing length and increasing mass of the exercise bars were the independent variables. A total of 21 male athletes who regularly performed strength and power training were included in this study. The bar twist exercise was performed using five bars. The five bars included one bar that was 2.00 m in length and 10.00 kg in weight (NB), two long bars with an increased length without changing the mass (2LB, 3LB), and two heavy bars with an increased mass by adding weight to the bar without changing the length (2HB, 3HB). The three-dimensional kinetic and kinematic variables were calculated. The principal findings were as follows: