Excessive exercise harms the body in five ways

　　We all know moderation exercise good for the body healthy , which can reduce weight and reduce the risk of many diseases in people disease , such as the risk of Alzheimer's disease. Considering the overwhelming benefits of exercise, it's clear that we need to stay physically active if we want to live healthy lives. But more exercise is better for us, right? No. Sometimes, exercise can be overdone ； Your body will tell you when you've exercised enough.

　　Previous research has found that long-term endurance training, such as marathons, triathlons and ultra-distance cycling races, can have a negative impact on cardiovascular health. For example, after a group of patients diagnosed with coronary artery disease performed more than the maximum recommended 60 minutes of exercise, their antioxidant levels dropped and their blood vessels stiffened. Meanwhile, patients who exercised for 60 minutes or less had fewer free radicals in their bodies, which improved their circulatory function.

　　American medicine media I recently summarized five different signs of overtraining.

　　one, heart rate Change

　　Molecular changes occur in athletes' hearts, which can cause them to develop heart-related health problems. Exercise physiology research has found that athletes who have been engaged in endurance events for a lifetime have a high rate of myocardial fibrosis, especially their heart cells that will also harden. This hardening can cause cardiac arrest and cause irregular heartbeats. Runners who continued to run more than 25 miles per week had the same risk of death as those who did not exercise.

　　2. Musculoskeletal changes

　　During exercise, muscles and bones will inevitably be damaged, and they require 24-48 hours of rest to fully recover. If muscle fatigue lasts for more than 48 hours, it means that the exerciser's physiological functions have been over-challenged and that his muscles and energy stores have not recovered effectively. Researchers at Johns Hopkins University School of Medicine believe that chronic fatigue after exercise indicates that the exerciser has overtrained.

　　3. Changes in the immune system

　　Excessive exercise impairs immune system function as the body struggles with fatigue and inadequate muscle recovery. Studies have shown that high-intensity endurance exercise for more than 90 minutes makes athletes more susceptible to illness within 72 hours after exercise because strenuous exercise can temporarily reduce the function of the immune system.

　　4. Hormone changes

　　Excessive training will affect the secretion function of hormones. Athletes experience increased levels of cortisol and adrenaline, also known as stress hormones, which can increase blood pressure and cholesterol levels, thereby suppressing immune system function. Overtraining also suppresses appetite by increasing the production of two hormones - epinephrine and norepinephrine. Insufficient caloric intake will slow down recovery and make the symptoms of overtraining more severe.

　　5. Sleep changes

　　Excessive exercise stresses the body, causing cortisol levels to rise. Elevated levels of cortisol and other hormones can affect sleep habits. The function of cortisol determines sleep patterns, so if cortisol levels rise excessively at bedtime, it can hinder sleep quality.