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 重要是因为等长收缩引起血液中 血压和儿茶酚胺水平 本研究旨在描述 年龄、性别、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三个志愿者组： 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）和高级运动员 Study. 他们分为四个年龄组：20-45岁、45-59岁、60-74岁和75岁 多年来。 他们是轻度到中度肥胖的身体脂肪范围 从20%到40%，并进一步细分为两个受试者亚组 代表上半身和下半身的肥胖类型。 正常对照 都很瘦，但年龄和性别与这些肥胖的受试者相匹配。 实验 所有受试者的方案都是相同的：在一个 手部测力计在30%的个人最大随意力下， 疲劳（通常3 - 6分钟）。 测试前，每隔一分钟 在测试期间和测试结束后3分钟，测量血压、心脏 率和血液样本的儿茶酚胺，葡萄糖和游离脂肪酸是 满员你 到目前为止，共有14个科目已从教学研究 养老院和老年运动员团体。 BLSA参与者的研究 将在明年启动。 我们计划在每个实验室测试40个受试者 四个年龄组。 这项研究应在明年完成。

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 increase in blood pressure and catecholamine levels. This study is designed to describe the relationships among age, sex, body weight, pattern of body fat distribution, level of physical fitness, and static exercise responses. The subjects for the study are selected from three volunteer groups: participants in the Johns Hopkins Academic Teaching Nursing Home, the Baltimore Longitudinal Study of Aging (BLSA), and the Senior Athletes Study. They are divided into four age groups: 20-45, 45-59, 60-74 and 75 and over years. They are mildly to moderately obese ranging in body fat from 20 to 40% and are further subdivided into two subgroups of subjects representing upper and lower body segment type of obesity. Normal controls are lean but age and sex matched to these obese subjects. 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 14 subjects have been studied from the Teaching Nursing Home and Senior Athletes groups. Studies in the BLSA participants will be initiated in the coming year. We plan to test 40 subjects in each of the 4 age groups. The study should be completed with the next year.