Serious eye strain can lead to persistent headaches, muscle pain in the head, neck and upper back, as well as long term problems like myopia.

严重的眼疲劳会导致长期的头痛，头部，颈部和上发背的肌肉疼痛，也可能会引起一个长期的问题近视。

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Function: Enhance the muscle strength of upper limbs, chest and the back., improve the cardiopulmonary function.

功能：增强上肢及背部肌肉力量，提高人的心肺功能。

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Functions: Enhance the muscle strength of upper limbs, chest and the back.

功能：增强上肢、胸、背部肌群的力量，提高人体心肺功能。

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Pettitte has been out since May 17 with a strained muscle in his upper back.

WSJ: Buchholz, Red Sox beat Yankees 3-0 in 5?? innings

The impressive outing was big for New York, which placed left-hander Andy Pettitte on the disabled list before the game with a strained left trapezius muscle in his upper back.

WSJ: Blue Jays' Buehrle loses to Yankees again, 5-0

Cueto (2-0) started for the first time since leaving his outing April 13 in the fifth inning with a strained left upper-back muscle.

NPR: Bruce Homers To Back Cueto In Reds' Win Over Mets