Exercise | Oxygen Uptake and Muscle Strength
The human body is made up of approximately 220 pairs of muscles and makes up about 45% of the total body weight. Normally, only 80-100 pairs of muscles are involved with everyday body motion. Other muscles, however, are employed in varied athletic moves and consequently, muscle strength can be developed by a training program.
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An individual’s strength, endurance, and the muscle size will increase in response to progressively increased resistive exercises. If this process isn’t used there will be little or no effect on the individual’s performance.
Muscle strength, with training, will soon equalise to physical demands. After they have been made to work heavier and repeatedly, muscles gain bulk and power to cope with physical activity and exercise intensity. This response called hypertrophy. In direct contrast, muscles will decrease in size and lose strength after some time without activity. The response is called atrophy.
As well the above paragraph depicted the outcomes of physical exercise and physical work or lack of it, has on the muscles, the inclusion of regular aerobic exercise will bring on further beneficial results, to the heart and blood vessels, in their attempt to deliver more oxygen to the muscle cells.
Regular physical exercise step-ups the efficiency and strength of the heart. The chambers of the heart can pump with each heartbeat more blood and empty more efficiently and the rate of beating at rest or below maximum effort lessens. The more physical exercise the more fitness a person gains and in turn the more physical exercise and work the body can do.
Oxygen uptake is the indicator of how heavy a person is exercising. This is based on the maximum oxygen uptake that a person can use up in a unit of time ml/min. The treadmill test is used to specify a person’s “Valium per time Oxygen Maximum” or maximal oxygen uptake (VO2 max).
During the treadmill test, as speed and level of difficulty step by step increases, ventilation and oxygen and carbon dioxide concentration of the breathed in and breathed out air is measured. Treadmill test is curried out until the individual gets deeply fatigued. Broadly speaking, most individuals can better their VO2 max, oxygen uptake, up 20% or more with physical exercise training. It is best to state that there are great individual differences in VO2max.
Various exercise intensity and VO2max required:
Low intensity exercise: from 30 – 50% of VO2max (fast walk)
Moderate intensity exercise: from 50 – 65% of VO2max (jog)
High intensity exercise: from 70 – 80% of VO2max (marathon run) and
Very high intensity exercise: from 80 – 150% of VO2max
muscle strength, physical exercise, exercise and oxygen uptake
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