Muscle strength, as measured by isometric maximal voluntary contractions in both straight and bent-knee calf exercises, improved in both groups.

在直膝和屈膝的小腿运动中，通过等长最大自主收缩来测量的肌肉力量在两组中都有所改善。

Now if I want to pick up a building, I could contract my muscles all I wanted, and develop a lot of tension without actually changing the muscle's length — in which case, I'd be experiencing isometric contractions.

现在，如果我想拿起一栋建筑，我可以随心所欲地收缩我的肌肉，并在不实际改变肌肉长度的情况下产生很大的张力——在这种情况下，我会经历等长收缩。