人體下肢為因應不同環境需求，其神經、肌肉系統會協調控制以產生適當的動作，而人體下肢勁度之特徵即為重要之動作效益指標。本文目的是藉由文獻回顧的方式，分別以人體下肢勁度模式、人體下肢勁度之調控等面向，探討人體下肢勁度之調控策略及其研究之價值。由先前研究發現，人體下肢勁度之變化能反應下肢對於能量吸收之情境及工作特徵，且較大之下肢勁度系統面對較大之外力時，較能維持關節之穩定以避免傷害；然而，人體動作過程之下肢勁度的變異量過大時，則較容易產生傷害。綜合以上研究，本文結語如下：人體之下肢勁度並非定值，故對於人體下肢勁度的調控策略進行更廣面向及深入的研究，不論是追求更佳的運動成效，或於傷害的預防上，實為未來運動生物力學研究發展之重要課題。

In response to different environmental requirements, neural control and muscle contraction will coordinate to regulate lower extremity stiffness and produce the appropriate movement; therefore, the properties of lower extremity stiffness are regarded as a critical index of movement efficiency. Through a review of relevant literature, this article examines models of the mechanisms of human body stiffness modulation and the utility of human lower limb stiffness control strategies. According to previous studies, changes in human lower limb stiffness can reflect the energy absorption and work characteristics of the task. Individuals with greater lower extremity stiffness develop more joint stability that can help prevent injury. However, when the variation in lower extremity stiffness is too great, the frequency of injuries increases. Human lower extremity stiffness is not a constant, so we conclude that more extensive, in-depth studies are needed regarding control strategies of human lower extremity stiffness. These are beneficial for improved injury prevention and better athletic results, and will shed light on studies of sport biomechanics and its development.