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The human body is a complex machine: many different systems work together to keep us alive and functioning. They include the cardiovascular, respiratory, muscular and skeletal systems. Each of these systems peak at different ages and unfortunately all start to decline at some point in our adult lives. But they all decline at different rates and on average this is all linked to your lifestyle and how much exercise you continue to do as you get into later life. The more active you are, the stronger these four systems are, slowing the process of aging. If you don't do any exercise, then you at a risk of starting to become "old" and daily functions become a lot harder sooner.
Cardiovascular And Respiratory Systems
The cardiovascular system encompasses the heart, arteries, veins and other blood vessels that provide the network for delivering blood and nutrients and oxygen around the body. The respiratory system is the lungs and how we breathe. These systems always work together and are often referred to as the cardio-respiratory system. Together, they allow us to be able to complete long-term exercise. The maximum capacity that they can work at is called the VO2 max which is the maximum amount of oxygen that the body can deliver — and this determines your upper level for stamina. This peaks at the age of 25! After that age, your VO2 max declines by one percent a year on average.
Muscular And Skeletal Systems
Again these two systems are normally linked together because the bones and muscles work together to provide us with movement — muscles are a bit like the strings that make our puppet frame (bones) work. As you get older and go through puberty the bones and muscles naturally develop due to a hormone called human growth hormone, in males with the added testosterone they develop a larger muscle mass than women. The bones and muscles reach their peak at approximately 30 which is the point at which the muscles are at their strongest. After this, with no exercise, your muscles and bones become gradually weaker.
Another effect of aging is that the metabolism slows down, which means that fewer calories are burned when at rest. This so suggests that your calorie intake should be lower. However, elderly people tend to be rather slim because the appetite becomes less and the lack of muscle leaves a thinner looking figure.
It is widely accepted that certain types of exercise will help to slow the aging process down and delay the age at which you reach your peak.
Studies have been shown to slow the rate down. An unusual study in the US has found that by infusing young blood into a group of mice can rejuvenate the harmful effects of the ageing process seen above. Villeda (2014) "found that blood from three-month-old mice reversed some age-related changes in the brains of 18-month-old mice. The animals grew more and stronger neural connections in a region called the hippocampus, meaning the brain cells could talk to each other more effectively, according to a report in Nature Medicine. An 18-month-old mouse is considered to be equivalent in age to a 70-year-old person" Villeda, University of California.