Effects of Joint Kinetics on Energy Cost during Repeated Vertical Jumping
Effects of Joint Kinetics on Energy Cost during Repeated Vertical Jumping
复制标题
关节动力学对重复垂直跳跃过程中能量消耗的影响
DOI：
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复制
发表时间：
2019
影响因子：
4.1
通讯作者：
Yasushi Enomoto
中科院分区：
文献类型：
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作者：
Keitaro Seki;H. Kyröläinen;Naoki Numazu;Keigo Ohyama;Yasushi Enomoto
目的探讨下肢关节动力学对跳跃运动能量消耗的影响。方法8名男性中长跑运动员自愿参加本研究。受试者被要求在三种不同的表面倾斜条件下以2 Hz的频率在测力平台上重复垂直跳跃3 min：倾斜（+8°），水平（0°）和下降（-8 °）。使用高速摄像机获得了运动平面运动学。同时，记录地面反力和下肢肌肉的肌电图。使用稳态摄氧量、呼吸比和身体的垂直距离计算能量成本。结果在各种情况下，能量消耗与膝关节总机械功呈正相关（r = 0.636，P < 0.01），与踝关节总机械功呈负相关（r =-0.584，P < 0.01）。腓肠肌和比目鱼肌的肌-腱复合体长度在倾斜时显著长于水平和下降时。腓肠肌在下降状态下表现出与倾斜和水平状态下不同的活动模式。结论踝、膝关节运动学及肌肉协调性与重复纵跳过程中的能量消耗有关。在不同的地面倾角上重复垂直跳跃时，下肢关节对产生相同总机械功的贡献率不同。当机械功主要由踝关节完成时，能量消耗较小。然而，当踝关节做较少的机械功时，膝关节和/或髋关节补偿踝关节的机械功的缺乏，并且能量消耗增加。
Purpose The present study was designed to investigate the effects of lower limb joint kinetics on energy cost during jumping. Methods Eight male middle and long-distance runners volunteered for the study. The subjects were asked to repeat vertical jumps at a frequency of 2 Hz for 3 min on a force platform in three different surface inclination conditions: Incline (+8°), Level (0°), and Decline (−8°). Sagittal plane kinematics were obtained using a high-speed video camera. Simultaneously, ground reaction forces and EMG of the lower limb muscles were recorded. Energy cost was calculated using steady-state oxygen uptake, respiratory ratio, and vertical distance of the body. Results In all conditions, energy cost correlated positively with total mechanical work of the knee joint (r = 0.636, P < 0.01), but negatively with total mechanical work of the ankle joint (r = −0.584, P < 0.01). The muscle–tendon complex length of the gastrocnemius and soleus muscles were significantly longer in incline than in level and decline. The gastrocnemius muscle showed different activity pattern in decline as compared with the incline and level conditions. Conclusions The present study revealed that the ankle and knee joint kinematics and, therefore muscles’ coordination are associated with energy cost during repeated vertical jumping. The lower limb joints contributed different efficiencies to generate the same total mechanical work in repeated vertical jumping on different surface inclinations. Energy cost was smaller when mechanical work was mainly done by ankle joint. Whereas, when the ankle joint did less mechanical work, the knee and/or hip joints compensated for the lack of mechanical work of the ankle joint and energy cost was increased.
影响因子：
2.8
作者：
Holt, Natalie C.;Roberts, Thomas J.;Askew, Graham N.
通讯作者：
Askew, Graham N.
影响因子：
3.3
作者：
FARLEY, CT;BLICKHAN, R;TAYLOR, CR
通讯作者：
TAYLOR, CR