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是研究心理生理机制，解释（a）参与体育活动的水平和（B）在两年的时间内，在848名年轻人的队列中，体育活动的自发变化。 将计算运动反应指数（ERI），该指数代表个体在进行渐进式自行车测力计测试时对运动的感知反应与对运动的生理反应之间的关系。 知觉反应包括知觉劳累（RPE）、整体情绪和劳累疼痛评分。生理反应包括氧耗、二氧化碳产生、心率、肺通气和乳酸浓度。 我们预计，低水平的体力活动或无法维持体力活动水平与劳力感知和潜在的生理介质之间的预期关系的适应不良解耦相关，因此，使体力活动不受欢迎。 本研究的受试者将包括848名年龄在27-30岁之间的个体，他们目前正在参与一项纵向研究，数据将在大约间隔两年的两个时间点收集。 数据将包括代谢，心血管和知觉反应的运动刺激在次最大的工作量。 受试者还将通过问卷完成对其当前体力活动的评估。 根据两次体力活动评估，受试者将在第二次评估时根据第一次评估时的活动水平被分类为“采用者”、“维持者”和“脱落者”或“非采用者”。 经过培训的面试官将与每位参与者进行一对一的半结构化面试，以确定导致身体活动模式或数量变化的因素。 将完成额外的问卷调查，以评估已被证明与体力活动相关的行为、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.