Abstract
The stop-jumping task is one of the most important technical actions in basketball. A previous study showed 70% probability of non-contact ACL injuries during stop-jumping tasks. Therefore, the present study aimed to investigate the differences in lower extremity biomechanical changes between the rear foot as the initial contact area to terminate the jump (SJR) and the fore foot as the initial contact area to also terminate the jump (SJF) during the horizontal landing during a stop-jumping phase. In total, 25 male amateur Ningbo University basketball athletes from China were recruited for this study. The participants were asked to jump vertically by using two different stop-jumping strategies. Kinematic and kinetics data were amassed during a stop-jumping task. Statistical parametric mapping (SPM) analysis was used to find the differences between SJR and SJF. Our results indicated that the change of different ankle range of motion caused significantly different values for knee angle (p < 0.001), velocity (p = 0.003) (p = 0.023) (p < 0.001), moment (p = 0.04) (p < 0.001), (p = 0.036) and power (p = 0.015) (p < 0.001) during the stop-jumping phase and the horizontal landing phase. The same biomechanical parameters of the hip joint were also significantly different for hip angle (p < 0.001), moment (p = 0.012) (p < 0.001) (p < 0.001), and power (p = 0.01) (p < 0.001) (p < 0.001). These findings indicate that altering the primary contact at the ankle angle might effectively reduce the risk of a knee injury.
Highlights
Termination tasks are common movements in basketball, volleyball, and soccer [1,2].These movements include stop-jumping, landing and side-cutting, etc
The initial ground contact to the maximum flexion of the knee was defined as the horizontal landing phase
Our findings demonstrate that the larger ankle angle resulted in a significant difference in the horizontal landing phase of the knee joint during the two stop-jumping strategies
Summary
Termination tasks are common movements in basketball, volleyball, and soccer [1,2] These movements include stop-jumping, landing and side-cutting, etc. According to a previous study, these types of termination tasks could cause significant injuries to athletes and have a significant effect on competition performance. Many researchers have attempted to seek as much information as possible about the in vivo mechanism or cause of injuries before they occur. An example of this is the parameters of biomechanical of the lower limbs as an essential index for injury prevention [4]. Lin and Paul define what a complete stop-jumping task is [5,6], whereby the participant performs an approach run, immediately stops (horizontal landing phase), and takes off
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