A depressing recession
Usually, VO2 is the first physical fitness index affected, followed by the decline of muscle structure, strength, strength, endurance and coordination. It is expected that athletes in non-training mode will also have elevated blood sugar and blood pressure. In fact, some changes happen very quickly. Bergdal explained that the aerobic enzymes that provide food for mitochondria decreased within a few days, while the adaptability of blood supply decreased relatively slowly. Basically, the local (intramuscular) metabolic system is greatly reduced relative to circulation and oxygen supply.
Bergdal said: "The research shows that VO2 drops by 7% to 65,438+00% after a sudden pause of 65,438+02 days, by 65,438+04% to 65,438+05% after 50 days, and by 65,438+06% after 80 days. The maximum output of the heart, the stroke output (the blood volume pumped by the heart in each contraction) and the ability of mitochondria to absorb oxygen also decreased in the same curve, while the heart rate increased. "
A person who can run 5 kilometers in 20 minutes usually loses about 10 seconds after a week of inactivity, but the percentage really begins to decline after 10 to 14 days. The runner began to lose muscle strength and began to increase the timing by about 1 min for 5 seconds. Between 14 and 30 days, it is expected that athletes will experience about 12% reduction of VO2 and obvious reduction of muscle strength.
Pi Nuo added: "Note that I described it as a decrease in muscle strength in the first two weeks, but now we describe it as a decrease in muscle strength."
It used to be 5 kilometers in 20 minutes, but now it is 5 kilometers in 23 minutes. At the time point of 1 ~ 2 months, athletes usually lose about 19~20% of VO2, and their muscle strength decreases obviously. At this stage, they tend to be about 24 minutes. After two months, athletes usually have a 26% decrease in VO2.
"Seeing what happened in the body was shocking, we began to see many changes in muscle, strength and fat levels-this really worsened your health structurally." Pi Nuo said.
Not surprisingly, after all these efforts, these remarkable declines are particularly frustrating for elite athletes.
He said: "Because of the fear of losing it, it really prevents people from starting to exercise. Well, they will-and the subsequent recovery will take longer, so it is important to remember this. "
Interestingly, Pi Nuo said that some people blame these declines, especially the decline in endurance, on age, but the fact is that a person's VO2 will not change significantly with age.
Muscle and fat
Aerobic exercise ability is lost first, but eventually muscle mass will also be lost. Bergdahl said that the wastage rate generally depends on age, and the older you get, the faster you lose muscle. However, although regular exercise may obviously improve the physiological function of the elderly, it can only slow down, but not completely prevent muscle atrophy.