数九寒冬,是锻炼身体、磨炼意志的大好季节。为达到预期的效果,卫生保健至关重要。 1.要做好准备活动。冬季,人的肌肉和韧带受到寒冷的刺激后,会反射性地引起血管收缩,粘滞性增加,弹性和伸展度降低,各关节活动幅度减小;神经系统对肌肉的协调指挥能力也有所下降。因此,锻炼前一定要做好充分的准备活动,使机体内各系统、器官(如心脏血液系 Number nine winter, is a good exercise, exercise the good season of the will. To achieve the desired effect, health care is crucial. To prepare for activities. In winter, the muscles and ligaments of human being are reflexively triggered by the cold stimulation, resulting in vasoconstriction, increased viscosity, decreased elasticity and extensibility, and decreased amplitude of various joint activities. The coordination ability of the nervous system to the muscles also decreases . Therefore, exercise must be fully prepared before the event, so that the body’s systems, organs (such as cardiac blood system