Abstract
Our study investigated the characteristics of the biomechanics of lower extremities during running single leg jump (RSJ) in collegiate basketball players. Twelve division III male basketball players voluntarily participated in this study. They performed three trials of the running single leg jump with two approach speeds (fast and preferred) randomly. The kinematic data were collected by motion analysis system (200 Hz), and kinetic data were collected using the AMTI force platform (1000 Hz), and electromyography (EMG) data were recorded by the Delsys surface Electromyography (EMG) system (2000 Hz). Kinematic, kinetic and EMG signal were synchronized using EvaRT 4.6. Peak Ground reaction force, eccentric loading rate (ELR), gastrocnemius (GA) of pre-activation phase, and tibialis anterior (TA) of push-off phase were found significantly larger in the fast approach speed (p < 0.05). RSJ improves muscle activation level and stretch reflex. Higher activation of TA and GA during RSJ may have the benefit of decreasing risk of injury and jump training. Thus, it is helpful in muscle stretch adaptation.
Highlights
Jumping ability is one of the most important skills of basketball players [1]
The primary results are as follows: (1) an approach run did not increase the joint moment and power outputs during running single leg jump (RSJ), and only a part increases in the GRF and eccentric loading rate (ELR) were observed; (2) the increasing approach speed was shorter in the downward and Biomechanical patterns and muscle activities during the pre-activation, downward and push-off push-off time; (3) the faster approach run increased the muscle pre-activation level of the GA and phases of RSJ were examined in this study
The primary results are as follows: (1) an approach run did activation level of the tibialis anterior (TA) during the push-off phase. These results supported the hypothesis that not increase the joint moment and power outputs during RSJ, and only a part increases in the GRF and biomechanical variables change with increased approach speed
Summary
Jumping ability is one of the most important skills of basketball players [1]. Blocked shots and lay-ups are common skills in basketball competition, which is performed with a single leg. Various studies investigated the biomechanical difference and functional application on RSJs movement through kinematic, kinetic and EMG They included the training effect of RSJ [4,5,10], the difference in long jump [8], high jump [7,11,12], and approach drop jump [10,13]. Some studies reported an approach that increases jumping movement activation level, improving the explosive power and coordination of the neuromuscular control of lower limbs [5,10]. The present study aimed to clarify the biomechanical characteristics and muscle activation condition of the lower extremities during RSJ in collegiate basketball players. We hypothesized that RSJ performance will be affected by running speed and that the lower extremity biomechanical parameters may correspond with muscle activation, in which the ankle joint may be an essential factor
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