A similar conclusion was reached by the authors of the other new study, in which young, fit men performed standard squats with barbells after either first stretching or not. The volunteers could manage 8.3 percent less weight after the static stretching. But even more interesting, they also reported that they felt less stable and more unbalanced after the stretching than when they didn't stretch.

另一项新研究得到了类似结论。实验中，年轻健壮的男性志愿者被要求拉伸或不拉伸后做标准蹲举杠铃的动作。拉伸后，志愿者能举起的杠铃重量比不拉伸时轻8.3%。更有意思的是，志愿者们表示，他们觉得拉伸后比不拉伸时重心更不稳、身体更不平衡。

Just why stretching hampers performance is not fully understood, although the authors of both of the new studies write that they suspect the problem is in part that stretching does exactly what we expect it to do. It loosens muscles and their accompanying tendons. But in the process, it makes them less able to store energy and spring into action, like lax elastic waistbands in old shorts, which I'm certain have added significantly to the pokiness of some of my past race times by requiring me manually to hold up the garment.

为什么拉伸会影响运动能力，这两项新研究的作者还不清楚，尽管他们怀疑部分原因是拉伸的确起到了我们所期望的效果：让肌肉与肌腱松弛。然而，拉伸也让肌肉储存能量和做爆发性动作的能力变差，就好比旧短裤上的松紧带一样——我敢肯定它害得我之前的跑步比赛用时过长，因为我要提着裤子赛跑。

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