有关调查发现,三成的城市人每天坐着不动的时间,超过7小时以上。对此专家指出,久坐会使肌肉长期处于紧张、收缩的状态,造成血液不易顺利回流,聚积在下肢,压迫腿部肌肉群,久而久之会出现下肢酸麻、肿胀的感觉。正确的坐姿能将身体的负担减到最低。椅子最好能有头靠、扶手和气靠? The survey found that 30% of city people sit still for more than 7 hours a day. Experts point out that sedentary will make the muscles in a long-term tension and contraction of the state, resulting in the blood is not easy to return smoothly, accumulate in the lower extremities, oppression of the leg muscles, as time passes there will be lower limb tingling, swelling feeling. Correct sitting can minimize the burden on the body. The best chairs can have headrests, armrests and gas by?