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做些调查，适量运动；如果超越适量会有如下副作用
http://en.wikipedia.org/wiki/Cycling
The most common cycling overuse injury occurs in the knees, affecting cyclists at all levels. These are caused by many factors:[30]
Incorrect bicycle fit or adjustment, particularly the saddle.
Incorrect adjustment of clipless pedals.
Too many hills, or too many miles, too early in the training season.
Poor training preparation for long touring rides.
Selecting too high a gear. A lower gear for uphill climb protects the knees, even though your muscles are well able to handle a higher gear.
Excessive saddle height can cause posterior knee pain, while setting the saddle too low can cause pain in the anterior of the knee. An incorrectly fitted saddle may eventually lead to muscle imbalance. A 25 to 35 degree knee angle is recommended to avoid an overuse injury.[31]
Overuse injuries, including chronic nerve damage at weight bearing locations, can occur as a result of repeatedly riding a bicycle for extended periods of time. Damage to the ulnar nerve in the palm, carpal tunnel in the wrist, the genitourinary tract[32] or bicycle seat neuropathy[33] may result from overuse. Recumbent bicycles are designed on different ergonomic principles and eliminate pressure from the saddle and handlebars, due to the relaxed riding position.
Note that overuse is a relative term, and capacity varies greatly between individuals. Someone starting out in cycling must be careful to increase length and frequency of cycling sessions slowly, starting for example at an hour or two per day, or a hundred miles or kilometers per week. Muscular pain is a normal by-product of the training process, but joint pain and numbness are early signs of overuse injury.
Cycling has been linked to sexual impotence due to pressure on the perineum from the seat, but fitting a proper sized seat prevents this effect.[34][35] In extreme cases, Pudendal Nerve Entrapment can be a source of intractable perineal pain.[36] Some cyclists with induced pudendal nerve pressure neuropathy gained relief from improvements in saddle position and riding techniques.[37]
The National Institute for Occupational Safety and Health (NIOSH) has investigated the potential health effects of prolonged bicycling in police bicycle patrol units, including the possibility that some bicycle saddles exert excessive pressure on the urogenital area of cyclists, restricting blood flow to the genitals. NIOSH is investigating whether saddles developed without protruding noses (which remove the pressure from the urogenital area) will alleviate any potential health problems.[38]
A Spanish study of top triathletes found those who cover more than 186 miles (300 km) a week on their bikes have less than 4% normal looking sperm.[39]
Despite rumors to the contrary, there is no scientific evidence linking cycling with testicular cancer.[40]
你家LD 看后肯定会收回批准书
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雷达卡
发表于 2010-9-23 18:13:40
显身卡