股四头肌使后腿膝盖伸直。
股四头肌帮助伸直膝盖。
爬台阶有助于提升和收紧臀肌、股四头肌，以及腿筋。
Steps work wonders for lifting and tightening the gluteal muscles, quadriceps, calves, and hamstrings.
股四头肌使大腿肌肉向下缩短，膝盖伸直。
The quadriceps muscles down the front of the thighs shorten to straighten the knees.
股四头肌伸展直腿，使膝盖保持在伸直状态。
通过轻轻地将大腿骨压向地面来收缩股四头肌。
Contract your quads by gently pressing your thighbones down into the floor.
保持四头肌的紧张，双脚会一直跟随着大腿向上，直到完全直立。
If you maintain the action of the quadriceps, the feet will follow the lift of your thighs until you are upright.
目的：观察392例儿麻后遗股四头肌重建术的疗效。
Objective: To observe the curative effect of quadriceps Femoris reestablishment on 392 cases of poliomyelitis.
冷身5分钟，拉伸小腿肌肉，腿筋和股四头肌，结束。
Finish with 5 minutes of cooldown stretching of the calf muscles, hamstrings, and quads.
四头肌的柔软对在悬岩要常做膝盖向下的动作很重要。
Quadriceps flexibility is crucial for the drop-knee move so frequently required on difficult overhanging routes.
如果你站立的姿势太宽，就不能很好地加强股四头肌的肌肉。
If your stance is too wide, you can't engage your quadriceps muscles well.
结论经验公式可为股四头肌肌腱延长术提供可靠的理论依据。
Conclusion This formula served as a reliable basis for the elongation of the femoral quadriceps 'tendon.
循环拉伸跟腱，股四头肌，小腿肌，后背的肌肉和肩部的肌肉。
Cycle through hamstring, quadricep, calf, lower back and shoulder stretches.
前言： 目的：观察392例儿麻后遗股四头肌重建术的疗效。
Objective:To observe the curative effect of quadriceps Femoris reestablishment on 392 cases of poliomyelitis.
核磁共振成像显示，我90%的右侧四头肌撕裂，于是我被飞机送回华盛顿。
When an MRI revealed that I'd torn 90 percent of my right quadriceps, I was flown back to Washington.
目的探讨针灸结合股四头肌强化训练治疗膝关节骨性关节炎的疗效。
Objective To explore the effect of acupuncture and moxibustion combined with quadriceps exercise on osteoarthritis of knee joint.
使用你的四头肌(前面的大腿肌肉)并延长你的躯干直到你能够将你的腿弄软。
Engage your quadriceps (front muscle on thigh) and extend your torso until you can melt over your legs.
训练运用股四头肌来伸直腿的最好的方法之一是腿伸直坐在地板上。
One of the best ways to start training the quads to work in the straight-knee position is by sitting on the floor with your legs stretched out straight in front of you.
拉伸股四头肌：股四头肌是大腿前侧的肌肉，对于你提升膝盖和提高速度很重要。
Quadriceps Stretch: the quadriceps is the muscle in the front of the thigh, important for lifting your knees and increasing your speed.
如果不会疼，那么在继续强化四头肌的同时，每周逐渐增加爬山强度。
If not then progressively add intensity each week with continual quads strengthening.
下坡跑有好处，但是容易伤着您的股四头肌。以下是如何避免这种伤害。
Downhill running has its upsides but kills your quads. Here's how to avoid the burn.
四头肌缩短，连接胫骨髌腱拉动髌骨上拉。这收缩的力量带来膝进入延长。
The quadriceps contracts, pulling on the patella which is connected to the tibia by the patellar tendon. The force of this contraction brings the knee into extension.
相同速度下，患侧和健侧股四头肌和腘绳肌离心收缩肌力明显大于向心收缩；
The eccentric contraction of both sides′ quadriceps and hamstring produced significantly higher torques than concentric contraction did in same speed.
通过重量训练或做运动来锻炼出四头肌和保护膝盖，从而使得你自己更加健康。
You can improve your health by training with free weights or doing exercises that will build up your quadriceps and protect your knees.
通过重量训练或做运动来锻炼出四头肌和保护膝盖，从而使得你自己更加健康。
You can improve your health by training with free weights or doing exercises that will build up your quadriceps and protect your knees.
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