Psycho-physiological Influences on Physical Activity

这项纵向研究的总体目标将是检查心理生理机制， 解释，（a）身体活动参与的水平和（B）身体活动在两周内的自发变化- 在848名年轻人的队列中进行了一年的时间。将计算运动反应指数（ERI）， 代表了个体对运动的感知反应与生理反应之间的关系。 在进行渐进式循环试验时对运动的反应。感知反应包括 感觉劳累（RPE）、整体情绪和劳累疼痛的评分。生理反应包括氧气 耗氧量、二氧化碳生成量、心率、肺通气量和乳酸 浓度.我们预计，低水平的体力活动或无法保持体力活动 水平与劳力感知和 潜在的生理介质，从而使身体活动不受欢迎。 这项研究的受试者将包括848名年龄在27-30岁之间的个体，他们目前正在接受治疗。 参与纵向研究。将在大约间隔两年的两个时间点收集数据。 数据将包括代谢，心血管和知觉反应的运动刺激在次最大 工作量。受试者还将通过问卷完成对他们当前体力活动的评估。 根据对体力活动的两项评估，受试者将被分类为“采用者”、“维持者”、 在第二次评估中，根据他们在第一次评估中的活动水平，确定他们是“辍学者”还是“未采用者”。一 一名经过培训的面试官将对每位参与者进行一对一的半结构化面试， 导致身体活动模式或数量发生变化的因素。补充调查表 将完成评估行为，环境，心理和社会因素，已显示 与身体活动有关。

The overall goal of this longitudinal study will be to examine psycho-physiological mechanisms that explain, (a) level of physical activity participation and (b) spontaneous change in physical activity over a two- year period in a cohort of 848 young adults. An exercise response index (ERI) will be calculated that represents the relationship between an individual's perceptual response to exercise and the physiological response to exercise while undergoing a progressive cycle ergome_er test. The perceptual responses include rating of perceived exertion (RPE), global mood and exertional pain. Physiological responses include oxygen oxygen consumption, carbon dioxide production, heart rate, pulmonary ventilation, and lactic acid concentration. We anticipate that low levels of physical activity or inability to maintain physical activity level is associated with a maladaptive uncoupling of the expected relation between exertional perceptions and the underlying physiological mediators, thus, making physical activity undesirable. The subjects for this study will include 848 individuals aged 27-30 years who are currently participating in a longitudinal study. Data will be collected at two time points approximately two years apart. Data will include metabolic, cardiovascular, and perceptual responses to an exercise stimulus at submaximal workloads. Subjects wiU also complete an assessment of their current physical activity with a questionnaire. Based on the two assessments of physical activity, subjects will be classified as "adopter", "maintainer", "drop-out" or "non-adopter" at the second assessment based on their activity level at the first assessment. A trained interviewer will conduct a one-on-one semi-structured interview with each participant to identify factors that contributed to any change in the pattern or amount of physical activity. Additional questionnaires will be completed to assess behavioral, environmental, psychological, and social factors that have been shown to be related to physical activity.