BACKGROUND:Studies have shown that obesity is associated with skeletal muscle pain, but the specific factors have not yet been discovered. OBJECTIVE: To analyze the possible development of latent myofascial trigger points in obese people. METHODS:Fifty-seven obese persons (aged 9-20 years) who participated in the summer camp of weight loss were investigated (for participants younger than 18 years old, written consent was obtained from their parents). Their body fat rate was more than 30%. A pressure algometer was used to measure the pressure pain thresholds at three different sites in the brachioradialis muscle: the lateral epicondyle at elbow (site A, assumed to be the A-TrP site), the mid-point of the muscle bely (site B, assumed to be the MTrP site), and the muscle-tendon junction as a control site (site C). In addition, 19 obese persons were selected randomly. They did the based exercise in badminton and table tennis in the next 2 weeks. RESULTS AND CONCLUSION:The results showed that, for al the obese participants in this study, the mean pressure pain threshold was lowest at the site B and highest at thesite C. For different genders, the pressure pain thresholds at the site A were significantly lower in the female than the male. With the increase of body mass index, the pressure pain thresholds at the site B was increased. However, no significant difference in the pressure pain thresholds at these three sites was found before and after exercise. It is concluded that the latent trigger point may appear in the brachioradialis after 9 years old. Women may be more likely to form the attachment trigger point in the tendon. Movement has no effect on the activation and elimination of latent trigger points.%背景：有研究显示肥胖与骨骼肌疼痛存在一定的相关性，但具体因素尚未发现。目的：分析肥胖人群中隐性触发点的可能性发展。 方法：选择暑期减肥夏令营中体脂率均大于30%，年龄在9-20岁自愿受试者57名(18岁以下营员由父母签订知情同意书)。用压力测痛仪测量受试者左右手臂肱桡肌肌腱结合处(C点)、隐性触发点处(B点)以及附着点处触发点(A点)的疼痛阈值。另外，随机选取其中19名受试者进行2周以羽毛球和乒乓球为主的运动锻炼，测量运动前后肱桡肌A、B、C 3点的疼痛阈值。 结果与结论：①受试者B点的疼痛阈值最低，C点的疼痛阈值最高。②男女比较，A点疼痛阈值存在明显差异，且女性明显低于男性。③B点的疼痛阈值随体质量指数的增加而增加。④运动前后，3点疼痛阈值也不存在显著性差异。结果说明，人体9岁后可能在肱桡肌处产生隐性触发点，女性可能更易形成附着点处触发点，运动对肱桡肌处隐性触发点的活化或消除均没有影响。
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