Because the blood sugar content in the body is low on an empty stomach, the ratio of running energy to fat will increase at this time, so you can consume more fat. However, due to the low blood sugar level on an empty stomach, blood sugar is the only source of brain energy.
Running on an empty stomach will further reduce the blood sugar content and make the brain lack the necessary energy source, which will easily lead to dizziness, limb weakness, and even syncope and other hypoglycemia. Although free fatty acids in blood can be the energy source of muscles such as myocardium, the utilization efficiency of fatty acids in myocardium is not very high. Too many fatty acids may cause various arrhythmias and even sudden death.
Extended data
Running on an empty stomach is not advisable. It's best to eat something before running, and then warm up for half an hour, but don't overeat, in case of insufficient blood supply to all parts of the body during exercise. Don't run immediately after supper. It is not advisable to run immediately after a meal. At this time, the blood is concentrated in the stomach for digestion, and immediate activities affect digestion. It is advisable to exercise for half an hour after supper.
The best time for running is 14:00~ 19:00. Human activities are controlled by biological clock, so it is more beneficial to health to arrange exercise time according to the law of biological clock.
It is ideal to run in winter between 14: 00 pm and 19: 00 pm. In addition, when the outdoor temperature is relatively high, the human body's own temperature is also relatively high and its physical strength is relatively abundant. At this time, it is easy to get excited, and it is easier to enter the state of exercise.
Afternoon (14:00~ 16:00): It is a good opportunity to strengthen physical strength, and the muscle endurance is 50% higher than other times. Dusk (17:00~ 19:00): Especially when the sun goes down, the human body's exercise ability reaches its peak, and its vision and hearing are more sensitive, and its heart rate and blood pressure also rise.
Precautions for running:
attitude
Running posture should be reasonable. The upper body should be straight, lean forward slightly, the shoulders should be relaxed, the elbows should bend naturally, and the arms should swing back and forth forcefully at the sides of the body. In the process of running, the stride length is not required to be large, but the stride frequency and stride length should be basically the same. Pay attention to the stability of the body's center of gravity, not ups and downs.
breathe
Breathing during running is very important. Breathing should have a certain rhythm. When breathing through the nose and mouth at the same time, the mouth does not need to be too wide, and the tongue can be rolled up to prolong the time of air in the mouth and reduce the stimulation of cold air to the respiratory tract. Beginners can suck in two steps and shout in three. Pay attention to exhaling gas from the lungs as much as possible every breath to increase the effective ventilation.
force
With the growth of age, our physical and mental endurance has dropped to the edge of the cliff. Decreased muscle protein is a typical aging disease. In the elderly, falls and fractures are more common because of their decreased muscle strength and extreme weakness. Research shows that strength training can also effectively reduce the frequency of falls and fractures in the elderly.
References:
Baidu encyclopedia-running
People's Network-Running on an empty stomach is harmful. Fun run, an office worker, should keep five points in mind.