摘要
[目的]分析不同工具重量和动作重复频次负荷(模拟拧螺丝次数)下持铆钉枪拧螺丝作业致腕部肌肉疲劳过程作业者血生化指标的变化情况。[方法]选取24名志愿者依据持枪重量(1、1.5和2 kg)随机分为3组,每组8人,各组均按5个频次负荷(0、90、135、180、225次)进行连续重复性模拟拧螺丝作业,每个频次负荷间隔5 min采血进行血生化指标的检测,包括乳酸(LA)、乳酸脱氢酶(LDH)、肌酸激酶(CK)和钙离子(Ca2+)。同时调查局部肌肉主观疲劳分值(RPE)。[结果]志愿者平均年龄(24.80±1.27)岁、身高(174.72±4.25)cm、体重(68.92±6.08)kg,各项指标均具有同质性。RPE随重量负荷呈线性、随频次负荷呈四项式升高趋势(均P<0.000 1);血CK、Ca2+的变化在各重量负荷组间差异均具有统计学意义(P<0.05或P<0.01);血CK、LDH、LA的变化在各频次负荷组间差异均具有统计学意义,且随频次负荷呈现升高趋势(P<0.05或P<0.01)。CK、频次负荷、RPE两两之间为中度正相关(r分别为0.630 1、0.812 1和0.589 6);LA与频次负荷和RPE为低度正相关(r分别为0.182 5和0.216 7)。CK、LDH、Ca2+3项血生化指标间均为中度正相关(r分别为0.329 5、0.501 5和0.434 2),均呈现先降后升的规律。[结论]CK、LDH、LA是反映肌肉疲劳灵敏有效的客观指标,适合评价低负荷重复性活动的疲劳进程。频次负荷、RPE和CK三者间存在较好的相关性和量效关系。重复频次是影响低负荷重复性活动疲劳的重要因素,合理安排工作对减缓疲劳有重要意义。
[Objective] To examine changes of blood biochemical indicators in the course of wrist muscle fatigue associated with tool weight and movement repetition in operating screw driver simulation. [Methods] Twenty-four volunteers were recruited randomly into three groups divided by tool weights of 1, 1.5, and 2 kg. Each group was asked to continuously complete repetitive simulation tasks containing five repetitiveness loads for 0, 90, 135, 180, and 225 times. The finger blood samples were taken for detecting lactate（LA）, and venous blood samples for creatine kinase（CK）, lactate dehydrogenate（LDH）, and calcium（Ca2＋） in fiveminute interval of each load as biochemical indicators. The rating of perceived exertion（RPE） of wrist muscles was recorded as subjective indicator of fatigue. [Results] All the twenty-four volunteers＇ age [（24.80±1.27） years], height [（174.72±4.25） cm], weight [（68.92±6.08） kg] were homogenous. The RPE scores showed a linearly rise with increase in tool weight load（P〈0.000 1） and a quartic rise with increase in repetitiveness load（P〈0.000 1）. There were significant changes of blood CK and Ca2＋ concentrations among the three weight load groups（P〈0.05 or P〈0.01）. There were significant changes of blood CK, LDH, and LA concentrations among the five repetitiveness load groups（P〈0.05 or P〈0.01） that appeared rising tendencies with higher repetitiveness load（P〈0.05）. Moderate positive correlations were identified among CK, repetitiveness load, and RPE, with coefficients of 0.630 1, 0.812 1, and 0.589 6, respectively. Low positive correlations were identified between LA and repetitiveness load, as well as between LA and RPE, whose coefficients were 0.182 5 and 0.216 7 respectively. For biochemical indicators, moderate positive correlations were significantly shown among CK, LDH, and Ca2＋, with a similar drop-rise tendency, and the coefficients were 0.329 5, 0.501 5, and 0.434 2 respectively. [Conclusion] Blood CK, LDH, and LA prove
出处
《环境与职业医学》
CAS
CSCD
北大核心
2015年第5期385-392,共8页
Journal of Environmental and Occupational Medicine
基金
国家自然科学基金项目(编号:81172643)
公益性行业科研专项(编号:201402021)
关键词
拧螺丝作业
局部肌肉
负荷
疲劳
生化指标
screw driver operation
local muscle
load
fatigue
biochemical indicator
