Psycho-physiological Influences on Physical Activity

描述(由申请人提供)： 这项纵向研究的总体目标将是检查心理生理机制，这些机制解释了(A)身体活动参与水平和(B)在两年期间848名年轻人队列中身体活动的自发变化。将计算运动反应指数(ERI)，该指数代表个人在接受递进式自行车测功机测试时对运动的感知反应和对运动的生理反应之间的关系。知觉反应包括感知劳力(RPE)、整体情绪和劳累疼痛。生理反应包括氧气消耗、二氧化碳产生、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维持体力活动水平与体力知觉和潜在的生理调节之间的预期关系的不适应脱钩有关，从而使体力活动变得不受欢迎。 这项研究的对象将包括848名年龄在27-30岁之间的人，他们目前正在参与一项纵向研究，数据将在大约两年的两个时间点收集。数据将包括在低于最大工作负荷时对运动刺激的代谢、心血管和知觉反应。受试者还将通过一份调查问卷完成对他们目前身体活动的评估。根据对体力活动的两次评估，受试者将在第二次评估中根据他们在第一次评估中的活动水平被归类为“养养者”、“养育者”和“辍学者”或“非养育者”。训练有素的面试者将对每个参与者进行一对一的半结构化面谈，以确定导致体力活动模式或运动量变化的因素。将完成其他问卷，以评估已被证明与体力活动有关的行为、环境、心理和社会因素。

DESCRIPTION (provided by applicant): 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 ergometer 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 will 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", and "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.