为什么你的大腿烧伤自行车吗？

The once commonly held belief that the accumulation of lactic acid in muscles causes the burning pain that accompanies muscle fatigue has been largely discredited by physiologists, according to a 2008 ScienceDaily article. According to a study published in the "Journal of Clinical Investigation" in 2008, the burning pain associated with tired muscles — including burning thighs while riding a bike — is likely caused by a calcium deficit in your muscles. The study's lead author, Dr. Andrew R. Marks, says that when muscles become tired from exertion, they start leaking calcium, which weakens contractions and stimulates an enzyme that destroys muscle fibers. Marks and his team found that muscle fibers in mice who ran on a treadmill to exhaustion, and the thigh muscles of cyclists who biked for three hours a day, produced this calcium leak.

Although burning thighs while riding your bike is unpleasant, the muscle damage incurred during muscle fatigue is repaired by the body after a few days of rest, says Marks. Furthermore, riding your bike regularly, even for just a few miles each day, will help improve your muscular endurance, or the length of time it takes your muscles to fatigue during aerobic activity. Riding your bike aerobically on a regular basis will help develop the slow-twitch muscle fibers — the muscle fibers involved in aerobic exercise — in your thighs, which will eventually allow you to bike for longer periods of time before encountering the burning sensation indicative of muscle fatigue.

Strength-building activities can help prevent muscle fatigue in your thighs' fast-twitch fibers — the muscle fibers involved in short, intense bursts of exertion, such as riding your bike up a hill. For example, static holds, or isometric exercises, that target the quads can help build strength useful in delaying muscle fatigue when cycling against resistance. Some static holds that target the quadriceps include the horse pose, the lateral angle pose and variations, the bow pose and the static L-hold. To do the most basic static hold for the quads, the horse pose, simply squat down with feet a little wider than shoulder-length apart as you would when doing a regular squat. Lower until your thighs are parallel with the floor, and then hold the pose for as long as you can.

虽然这是正常的肌肉疲劳和“燃烧”力竭运动过程中，一定要停止运动，如果你骑自行车或执行其他类型的运动时感到任何疼痛显著休息是很重要的。自我超越过去的自己的极限会导致伤害，特别是如果你的形状了。此外，如果遇到有烧灼感大腿上的皮肤，而不是在你的大腿肌肉，你可能不相关的肌肉疲劳皮肤状况。燃烧的皮肤瘙痒可能表明您已经皮炎引起的过敏反应或慢性皮肤疾病，如湿疹，为此可能需要就医。