ISOMETRIC EXERCISE AND AGE--CARDIOVASCULAR-SYMPATHOADRENAL-METABOLIC RESPONSES

静态（等长）肌肉收缩是运动中常见的努力成分， 进行日常活动。 静态锻炼的问题变成了 这一点很重要，因为等长收缩导致血液中 血压和儿茶酚胺水平 本研究旨在描述 年龄、性别、种族、体重、体脂模式之间的关系 分布、体能水平和静态运动反应。 本研究的受试者选自四个志愿者组： 参加约翰霍普金斯学术教学疗养院， 巴尔的摩老龄化纵向研究（BLSA），高级运动员研究和 志愿者在这样的环境中工作。 他们被分为四个年龄段 年龄组：20-45岁、45-59岁、60-74岁和75岁及以上。 他们的肥胖范围 从瘦到中度肥胖，并进一步细分为亚组， 代表上半身和下半身肥胖类型的受试者。 的 实验方案对所有受试者都是相同的： 在手部测力计上以30%的个人最大自主力量进行锻炼 疲劳（通常3 - 6分钟）。 在测试前一分钟 在测试期间的间隔，以及其终止后3分钟，血液 血压、心率和血液样本中的儿茶酚胺、葡萄糖和游离 脂肪酸被拿走了。 迄今为止，共研究了170名受试者 来自不同的人口群体。 招募160名受试者的目标是 刚刚被超越，结果分析将在 来年

Static (isometric) muscle contractions are common components of effort in performing daily activities. The problem of static exercise becomes important since isometric contractions cause marked increases in blood pressure and catecholamine levels. This study is designed to describe the relationships among age, sex, race, body weight, pattern of body fat distribution, level of physical fitness, and static exercise responses. The subjects for the study are selected from four volunteer groups: participants in the Johns Hopkins Academic Teaching Nursing Home, the Baltimore Longitudinal Study of Aging (BLSA), the Senior Athletes Study and volunteers working in this environment. They are divided into four age groups: 20-45, 45-59, 60-74 and 75 and over years. They range in obesity from lean to moderately obese and are further subdivided into subgroups of subjects representing upper and lower body segment type of obesity. The experimental protocol is the same for all subjects: sustained hand-grip exercise on a hand dynamometer at 30% of their individual maximal voluntary force to fatigue (usually 3 - 6 minutes). Before the test, at one minute intervals during the test, and 3 minutes after its termination, blood pressure, heart rate and blood samples for catecholamines, glucose and free fatty acids are taken. To date, a total of 170 subjects have been studied from several population groups. The goal of recruiting 160 subjects has just been surpassed and analyses of the results will be conducted in the coming year.