Notice how your ankles flex, how your calf muscles contract and how your knees bend.
留意你的踝关节如何曲伸，小腿肚上的肌肉如何收紧和膝关节如何弯曲。
The focus was on intense eccentric exercise, which is when muscles contract and lengthen at the same time.
重点是高强度的反常运动使肌肉同时收缩和舒张。
When these muscles contract, we stabilize the spine, pelvis and shoulders and create a solid base of support.
当这些肌肉收缩的时候，对于脊骨、盆骨以及肩部起到固定、支持的作用。
Attached to the bone, and controlled by the innervations, skeletal muscles contract and diastole to move the bones to produce movement.
骨骼肌附在骨上，在神经支配下进行收缩和舒张，牵拉骨产生运动。
Many different techniques have emerged over the years, most of which involve applying small jolts of electricity externally to muscles, via electrodes on the skin, to make them contract.
过去几年里许多不同的技术层出不穷，大部分是同过皮肤上的电极从外部对肌肉施加微小的电震动，使肌肉收缩。
But this is far from an iron law. The same muscles sometimes contract when people are feeling sadness or disgust, for example.
但这远不是铁律，例如，当人们感到悲哀或者厌恶时，颧骨肌肉有时也会同样收缩。
The team also subjected mouse muscles to a standardized stress test where they are simultaneously stretched and caused to contract.
这个研究组还对小鼠的肌肉做了标准化压力测试，将它们同时拉伸然后待其自然收缩。
You might also contract your pelvic floor muscles just before and during any activity that puts pressure on your abdomen, such as sneezing, coughing, laughing or heavy lifting.
您可以在腹压增大之前和正在增加的时候收缩盆底肌，比如喷嚏、咳嗽、大笑或举重等情况下。
For others the difference is very subtle and for others it only becomes noticeable when they smile and contract the muscles in their face.
对于其他人来说，这样的区别是非常小的，只有当她们微笑的时候对比她们脸部肌肉的时候才能看出来。
We think of them as signifying happiness, and indeed, researchers do find that the more intensely people contract their zygomaticus major muscles, the happier they say they feel.
研究者也发现，人们在微笑时，颧骨肌肉收缩得越厉害，人们感到的快乐感也会随之提高。
Fat and connective tissue start developing within your muscles, leaving less muscle tissue to contract to move your body.
肌肉内开始出现脂肪和结缔组织；身体动作能用到的肌肉变少。
It takes diligence to identify your pelvic floor muscles and learn how to contract and relax them. Here are some Pointers.
找到盆底肌的位置，学会如何收缩和放松肌肉，不断地练习让自己熟练掌握这一技巧。
Researchers have been experimenting with artificial muscles-electroactive polymers that can expand or contract when a voltage is applied-for decades.
研究人员几十年来一直在研究人造肌肉，这是一种电活性聚合物，加载电压时会膨胀或收缩。
When the zygomaticus major muscles in our cheeks contract, they draw up the corners of our mouths.
当我们面颊两侧颧肌收缩时，嘴角就会提起。
If muscles can't contract, they can't move, resulting in paralysis.
如果肌肉不能收缩，神经就不能移动，这就造成了瘫痪。
Nerve gases attack the nervous system of the body by interrupting the breakdown of neurotransmitters that signal muscles to contract.
神经毒气通过阻断指示肌肉收缩的神经递质分解而侵袭人体神经系统。
The nerve impulses cause the muscles to contract, thus narrowing the airway.
这些神经冲动产生肌肉收缩，气道痉挛。
Well, when the air is frigid, it doesn't warm up sufficiently before it reaches the airways leading to your lungs, and so it shocks the surrounding muscles and causes them to contract.
因为在寒冷的空气到达通向肺部的气管时还没有得到充分的热身，所以冲击到周围的肌肉使其收缩。
It's important that we stretch our muscles because they contract during exercise and the daily rigors of living.
拉伸我们的肌肉是很重要的，因为它们在运动和平时快节奏生活的中都会收缩。
Muscles will only contract forcefully a certain number of times before they refuse to pull hard again.
肌肉在强力收缩一定次数之后将无法再继续用力的拉缩。
When hydrogen ions accumulate, it becomes difficult for the muscles to contract. That makes running feel more strenuous, and causes that distinct burning sensation we feel after a challenging workout.
当氢离子堆积时，肌肉收缩越来越困难，跑步越来越艰苦，在艰苦的训练之后，有一种难以承受的感觉。
When muscles have to contract a long way, they usually do so quickly and with little force.
当肌肉必须收缩很长距离的时候，它移动更快，产生的力量也更小。
The sugar is believed to modify the nerve muscles that would otherwise tell the muscles in the diaphragm to contract spasmodicallyand contribute to hiccups.
糖被认为可以调节神经肌肉，这种神经肌肉可以控制断续性收缩并引起打嗝的横膈膜肌肉。
Our body needs a small amount of salt to maintain our water balance and help our muscles to contract.
我们的身体需要少量盐为保持我们的水平衡，帮助我们的肌肉收缩。
The quadriceps muscles along the front of the thigh firmly contract to straighten the knees.
股四头肌处于大腿前侧，有力收缩使膝盖伸直。
You can contract your muscles more powerfully by linking up your breathing to the exercise.
你可以将呼吸与运动保持一致，使肌肉收缩更有力。
You can contract your muscles more powerfully by linking up your breathing to the exercise.
你可以将呼吸与运动保持一致，使肌肉收缩更有力。
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