Nicotine also binds to receptors on skeletal muscles causing relaxed muscle tone.

尼古丁还可与骨骼肌中的受体结合，导致肌张力下降。

Usually, newborns with Prader-Willi syndrome have low muscle tone making them extremely floppy.

普拉德-威利综合征的新生儿常伴随肌张力低下，肌肉非常松弛。

Astronauts on the space station already perform specific exercises to keep their weight-bearing muscles toned.

为了不让肌肉松弛，太空站上的宇航员已经开始一些具体的锻炼。

This results in seizures, motor delay, low muscle tone, and rapid degeneration of the nervous system.

这会导致癫痫、运动发育迟缓、肌张力低下和神经系统快速的退行性变。

That led to a 19 percent decrease in muscle tone during a trip to the International Space Station.

这样一来，宇航员在国际空间站期间，他们的肌肉张力会下降19%。

The level of consciousness may also decrease and give rise to flaccid paralysis, where there's reduced muscle tone.

意识水平也可能下降，而且随着肌肉张力的降低，也可能发生弛缓性麻痹。

When the nerves in the face have been damaged, the lack of muscle tone can morph the facial bones.

当面部神经受损时，由于缺乏肌肉张力，面部骨骼会发生改变。

A regular brisk walk will improve muscle tone.

【tone】经常快步走能使肌肉更加紧实。

Exercise can strengthen and tone muscles.

【tone】锻炼能使肌肉更强健结实。

Now look at the old ones from atlanta, the muscle tone has changed.

对比在亚特兰大收到的老照片 肌肉的状况改变了。

Studies dating back to the 1930s indicate that laughter relaxes muscles, decreasing muscle tone for up to 45 minutes after the laugh dies down.

可追溯到 1930 年代的研究表明，笑可以放松肌肉，在笑声消失后长达 45 分钟内，肌肉张力降低。

Great. Just keep in mind astronauts lose a lot of muscle tone in space, so you might have to do most of the heavy lifting.

好的 但提醒你件事宇航员的肌肉张力会减弱所以今晚的" 重活" 大多得靠你了。

People with Type 2 usually don't experience the sudden loss of muscle tone, and they also generally have normal levels of hypocretin.

2 型患者通常不会出现肌张力突然下降的情况，而且他们的下垂素水平通常也处于正常水平。

Interestingly, these neurons become so starved for stimulation, they become hypersensitive and start firing inappropriately, causing increased muscle tone and muscle spasms, so we call this spastic paralysis.

有趣的是，这些神经元变得非常" 渴望" 刺激，它们会变得极度敏感，并开始不恰当地发放冲动，引起肌肉张力增加和肌肉痉挛，所以称之为痉挛性瘫痪（硬瘫）。

In August, the FDA approved the first treatment for IH, a drug that was already approved to treat sleepiness and sudden loss of muscle tone in people with narcolepsy.

8 月，FDA 批准了 IH 的第一种治疗方法，该药物已被批准用于治疗发作性睡病患者的嗜睡和肌肉张力突然丧失。

STEP 4 Do strength training to keep your body injury free. Increasing muscle tone in all areas of your body helps you on longer run days and gives you greater power.

进行力量训练，避免身体受伤。增强身体各部位的肌肉可以帮你跑得更远，让你更有力量。

It's ok, I know how it is. This machine here will work out your upper body, mainly your triceps and biceps. Are you looking to develop strength or muscle tone and definition?

没关系，我知道。这台机器首先从你的上半身开始起作用，主要是肱三头肌和二头肌。你是想增强力量还是锻炼肌肉和线条？

First, there are, yes, physical changes: the slow decline of reaction time, muscle tone, and strength, cardiac output, sex hormone production, and sharpness of senses like hearing and sight.

首先， 是的， 身体变化：反应时间、 肌肉张力和力量、 心输出量、 性激素产生以及听觉和视觉等感官敏锐度的缓慢下降。

Due to the mechanics of our sleep cycles during the fourth stage of sleep called rapid eye movement or rim, we experience a loss of muscle tone that naturally stops our arms and legs from controlled movement.

由于我们的睡眠周期机制在睡眠的第四阶段称为快速眼动或边缘，我们会经历肌张力的丧失，自然会阻止我们的手臂和腿受控运动。