时差N小时 肌肉生而不平等?(下)

So they can contract more slowly, but can keep going without burning themselves out.

所以，慢收缩肌肉纤维收缩更慢，但是持续时间更长。

Right, slow-twitch¹ fibers³ have a lot of myoglobin, a protein that helps transfer oxygen into the mitochondria, the power houses of the cell that produce cellular⁴ energy.

慢收缩肌肉纤维含有大量的肌红蛋白，这是一种帮助氧气进入线粒体的蛋白质，线粒体是细胞产生细胞能量的能量屋。

So marathon runners must have a lot of slow twitch muscle fibers.

那么，马拉松选手肯定有很多慢收缩肌肉纤维了。

Exactly, since they have to keep going for long periods.

说的对，因为马拉松耗能耗时长。

So, sprinters must have a lot of fast-twitch muscle fibers.

所以，短跑运动员必须有很多快速收缩的肌肉纤维。

Right! Fast twitch fibers consume energy quickly and are good for short, powerful bursts of movement like sprinting⁵ and jumping.

对，快收缩肌肉纤维耗能快，特别适合短而有力的爆发性动作，比如短跑和跳跃，

World-class sprinters typically have about 80% fast twitchmuscle fiber².

世界级短跑健将体内80%肌肉都是快收缩肌肉纤维。

Luck dogs!

真是幸福!

And, of course, they train incredibly hard to develop their natural gifts. Olympic gold is not won by muscle fiber alone.

当然，他们不仅仅靠天赋，还有艰苦地训练来完善技能。获得奥运金牌可并非肌肉纤维就可以。

But it certainly helps!

但是不得不承认肌肉纤维起了作用。

1 twitch   

v.急拉，抽动，痉挛，抽搐；n.扯，阵痛，痉挛

参考例句：

• The smell made my dog's nose twitch.那股气味使我的狗的鼻子抽动着。
• I felt a twitch at my sleeve.我觉得有人扯了一下我的袖子。

2 fiber   

n.纤维，纤维质

参考例句：

• The basic structural unit of yarn is the fiber.纤维是纱的基本结构单元。
• The material must be free of fiber clumps.这种材料必须无纤维块。

3 fibers   

光纤( fiber的名词复数 )； （织物的）质地； 纤维，纤维物质

参考例句：

• Thesolution of collagen-PVA was wet spined with the sodium sulfate as coagulant and collagen-PVA composite fibers were prepared. 在此基础上，以硫酸钠为凝固剂，对胶原-PVA共混溶液进行湿法纺丝，制备了胶原-PVA复合纤维。
• Sympathetic fibers are distributed to all regions of the heart. 交感神经纤维分布于心脏的所有部分。

4 cellular   

adj.移动的；细胞的，由细胞组成的

参考例句：

• She has a cellular telephone in her car.她的汽车里有一部无线通讯电话机。
• Many people use cellular materials as sensitive elements in hygrometers.很多人用蜂窝状的材料作为测量温度的传感元件。

5 sprinting   

v.短距离疾跑( sprint的现在分词 )

参考例句：

• Stride length and frequency are the most important elements of sprinting. 步长和步频是短跑最重要的因素。 来自互联网
• Xiaoming won the gold medal for sprinting in the school sports meeting. 小明在学校运动会上夺得了短跑金牌。 来自互联网