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Circulatory and metabolic parameters for determining a work capacity of upper limb muscles

用于确定上肢肌肉工作能力的循环和代谢参数

基本信息

批准号：
12680054
负责人：
KAGAYA Atsuko
金额：
$ 2.43万
依托单位：
Research Institute of Physical Fitness, Japan Women's College of Physical Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

Purpose of this study was to evaluate the work capacity of upper limb muscles with respect to circulatory and metabolic responses to exercise. Blood pressure (Finapres), brachial arterial blood flow (Doppler ultrasound method), and forearm muscle oxygenation (NIRS) were determined during 30-s static handgrip exercise in 16 healthy young females (21.6 yrs). Exercise was repeated at 30-s interval, with increasing load, and continued until exhaustion. Brachial arterial blood flow during exercise did not increase despite of increasing load, whereas immediate post-exercise blood flow significantly increased with the load. Blood pressure did not change or increased slightly at a lower intensity, and increased steeply at higher intensity. The load at which blood pressure began to increase markedly (BP_<critical>) corresponded to 30.7±1.9 % MVC. The BP_<critical> did not differ from the load at which de-oxygenation of the forearm flexor muscles was accelerated, and the loads estimated from both parameters were closely related to each other (r=0.517, p<0.05). A significant correlation coefficient was also obtained between BP_<critical> and final load subjects could perform. The results suggest that BP_<critical> reflects muscle metabolism and is recommended to use as an indicator of work capacity of regional muscles. Using this procedure, the BP_<critical> of 32 women aged 35-58 years were determined. The mean BP_<critical> value for women aged 50 years (9.8±1.0 kg) was lower compared to means for 40 and 30 years old (10.5±1.1 kg, 10.7±1.1 kg, respectively). No significant relationship was found between forearm muscle thickness and BP_<critical>, indicating its independence of muscle mass. These results suggest that the BP_<critical> is a useful indicator for evaluating muscle endurance capacity.

本研究的目的是评估上肢肌肉的工作能力与循环和代谢反应的运动。对16名21.6岁健康青年女性在30秒静态握力运动中的血压（Finapres）、肱动脉血流（多普勒超声法）和前臂肌氧合（NIRS）进行了测定。以30秒的间隔重复运动，增加负荷，并持续到筋疲力尽。运动期间肱动脉血流量没有增加，尽管增加负荷，而立即运动后血流量显着增加的负荷。血压在较低强度下没有变化或略有增加，在较高强度下急剧增加。血压开始显著升高的负荷（BP_（1））<critical>为30.7± 1.9%MVC. BP_1<critical>与前臂屈肌加速去氧负荷无显著性差异，且两者所估计的负荷值之间存在显著相关性（r=0.517，p<0.05）。BP_（1/2）与受试者的最后负荷之间也有显著的相关性<critical>。结果表明，BP_<critical>（1/2）反映了肌肉的代谢情况，可作为局部肌肉作功能力的指标。用此方法测定了<critical>32例35-58岁妇女的血压。50岁女性的平均BP_<critical>值（9.8±1.0 kg）低于40岁和30岁女性的平均值（分别为10.5±1.1 kg和10.7±1.1 kg）。前臂肌厚度与BP_（1/2）无显著相关性<critical>，表明其与肌肉质量无关。结果表明，BP_1<critical>是评价肌肉耐力的一个有用指标。