广枣提取液对小鼠免疫功能和运动耐力的影响

观察了广枣提取液对小鼠免疫功能、运动耐力的影响。结果表明：广枣提取液可明显增加小鼠耐缺氧时间，延长小鼠负重游泳时间，降低运动后小鼠血乳酸水平，显著提高其心肌组织中SOD活力；同时明显增加小鼠脾脏／体重、胸腺／体重比值，增强小鼠对巨噬细胞的吞噬能力．提高小鼠的细胞免疫、体液免疫功能。提示广枣提取液具有显著促进小鼠免疫功能及显著提高小鼠运动耐力的功效。     

A prospective study on changes of cognitions, interpersonal influences, and physical activity in Taiwanese youth

The decline of physical activity during adolescence is not well understood. This prospective study followed 969 Taiwanese students from eighth to ninth grade and examined their physical activity-related cognitions, interpersonal influences, and behavior of physical activity across the grade transition. Gender differences were found in the effects of the grade transition on physical activity and its related cognitions. The correlation coefficients showed moderate tracking for physical activity, cognitions, and interpersonal influences for both genders. The results also indicated that cognitions are more stable than behavior. The present study provides evidence of the decline in physical activity in Taiwanese youth across the grade transition as well as gender differences in the variables cognitions and interpersonal influences.