The knee is a crucial yet complex joint in the human body. As the primary weight-bearing structure during upright posture, it experiences significant wear and tear over time, making it the joint with the highest incidence of disorders. Knee joint issues stem from diverse causes—internal joint vulnerabilities as well as external factors. The common belief that stair climbing harms knees holds some truth.
Anatomically, the muscles and cartilage surrounding the knee joint are among the body's most vulnerable areas. The bones above and below bear approximately 90% of the body's weight, making the knee joint most susceptible to injury during movement. While stair climbing is a common fitness activity with many benefits—such as improving cardiovascular health and muscle coordination—it also carries potential drawbacks.
Some doctors call mountain climbing the dumbest exercise because, like stair climbing, it's a weight-bearing activity. From the waist to the soles of the feet, the entire body weight is borne, and the knee joints must constantly bend during both activities. The resulting wear and tear is considerable, and this damage cannot be repaired by external forces. This is one reason why elderly people often experience joint pain, so they should avoid excessive participation in such activities.
Many people deeply understand the saying "Going up is easy, coming down is hard." When ascending, one bears only their own weight. Descending, however, adds gravity's force accelerating the movement. Maintaining balance requires countering this downward force, which places even greater stress on the knees. Poor force control can lead to dangerous situations.
Of course, hiking and stair climbing aren't interchangeable. Stair climbing involves rapid vertical movement with greater physical strain, as stairs are nearly vertical. Hiking, however, progresses gradually upward, resulting in relatively lower physical demands compared to stair climbing.
How to approach stair climbing and hiking wisely?
First, always warm up thoroughly—stretch and knead leg muscles and knees to stimulate synovial fluid production. Consider knee braces and proper footwear.
Next, pace yourself during activity: manage speed and intensity reasonably, stay relaxed, rest when feeling soreness, and savor the joy of movement.
Opt for dirt paths whenever possible. Dirt trails and winding mountain roads are gentler on the knees than concrete paths or steps.
After exercise, engage in gentle movements to allow your knees to relax naturally, which helps protect them.
Compared to activities like mountain climbing or stair climbing, swimming and cycling are the most suitable exercises for those with weak knees. For older adults, slow-paced hiking is preferable to stair climbing.