Abstract
The countermovement jump is a popular measurement modality to evaluate muscle power in sports and exercise. Muscle power is essential to achieve a high jump, yet the well-coordinated movement of the body segments, which optimizes the stretch-shorten-ing cycle (SSC) effects, is also required. Among the proposed ex-planations of SSC effects, this study investigated whether the ankle joint kinematics, kinetics, and muscle-tendon interaction de-pend on the level of jump skill and the jump task. Sixteen healthy males were grouped as a function of their jump height (High jumpers; greater than 50 cm, Low jumpers; less than 50 cm). They were instructed to jump with two intensities; light effort (20 % of their height) and maximal effort. Joint kinematics and kinetics of the lower limbs were analyzed using a 3-dimensional motion analysis system. The muscle-tendon interaction was investigated using B-mode real-time ultrasonography. As the jump intensity increased, all participants jumped with increased joint velocity and power. However, the high jumper shows less fascicle shortening velocity (-0.2 ± 0.1 m/s) than the low jumper group (-0.3 ± 0.1 m/s) and greater tendon velocity, which indicated the capabil-ity of elastic energy recoil. In addition, the delayed onset time of ankle extension in the high jumper implies better use of the cata-pult mechanism. The findings of this study showed that the mus-cle-tendon interaction differs depending on the jump skill level, suggesting a more efficient neuromuscular control in skilled jumpers.
Original language | English |
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Pages (from-to) | 189-195 |
Number of pages | 7 |
Journal | Journal of Sports Science and Medicine |
Volume | 22 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2023 |
Bibliographical note
Publisher Copyright:© Journal of Sports Science and Medicine.
All Science Journal Classification (ASJC) codes
- Orthopedics and Sports Medicine
- Physical Therapy, Sports Therapy and Rehabilitation