8900B

1. Patients with heart disease, because the speed of the treadmill is difficult to control, the heart load is also relatively large, and it is very dangerous in the event of an accident;

2, people with osteoporosis, due to reduced bone density, ligaments are slack, easy to sprain, fall, and fracture during high-intensity running.

3, people with arthritis, meniscus or ligament injury or artificial joint replacement, due to high frequency of running will cause repeated wear of the hip joint, knee joint, ankle joint, resulting in more and more joint injuries;

4. People with cervical spondylosis and lumbar spondylosis may have neck and back muscle tension due to running for a long time in a high concentration of attention. The treadmill also has a recoil on the spine, which may aggravate the original condition.