上山容易落山難

研究顯示，落山或落斜路的時候（斜度大約是19%），膝關節的壓力會高達體重的7-8.5倍；相比之下，另一研究指出上梯級時膝關節的壓力只是體重的3-6倍。更多的膝關節壓力代表需要更強的肌力去保護關節。研究的另一重點是，落山落斜後的肌肉痠痛與肌肉離心收縮有關，而痠痛的肌肉多位於大腿與小腿。由此證明了「上山容易落山難」這一句說話。

runrun.com.hk

When you think about muscle contractions, most people will assume this to mean a concentric (同中心的) contraction, such a biceps curl, in which the muscle simultaneously contracts and shortens. There is another type of contraction in which the muscle lengthens as it contracts. This is called an eccentric muscle contraction (肌肉離心收縮).

verywellfit.com