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Exercise intensity refers to how much energy is expended when exercising. Perceived intensity varies with each person. It has been found that intensity has an effect on what fuel the body uses and what kind of adaptations the body makes after exercise. Intensity is the amount of physical power (expressed as a percentage of the maximal oxygen ...
Physical fitness is a state of health and well-being and, more specifically, the ability to perform aspects of sports, occupations, and daily activities. Physical fitness is generally achieved through proper nutrition, [ 1] moderate-vigorous physical exercise, [ 2] and sufficient rest along with a formal recovery plan.
Muscle fatigue is when muscles that were initially generating a normal amount of force, then experience a declining ability to generate force. It can be a result of vigorous exercise, but abnormal fatigue may be caused by barriers to or interference with the different stages of muscle contraction. There are two main causes of muscle fatigue ...
Endorphin production can be triggered by vigorous aerobic exercise. The release of β-endorphin has been postulated to contribute to the phenomenon known as "runner's high". [41] [42] However, several studies have supported the hypothesis that the runner's high is due to the release of endocannabinoids rather than that of endorphins. [43]
Cycling is a popular form of exercise. Weight training. Exercise is physical activity that enhances or maintains fitness and overall health. [1] [2] It is performed for various reasons, including weight loss or maintenance, to aid growth and improve strength, develop muscles and the cardiovascular system, hone athletic skills, improve health, [3] or simply for enjoyment.
Physical activity is defined as any voluntary bodily movement produced by skeletal muscles that requires energy expenditure. [ 1] Physical activity encompasses all activities, at any intensity, performed during any time of day or night. [ 2] It includes both voluntary exercise and incidental activity integrated into the daily routine. [ 3]
Heterosis. Time course imaging of two maize inbreds and their F1 hybrid (middle) exhibiting heterosis. Heterosis, hybrid vigor, or outbreeding enhancement is the improved or increased function of any biological quality in a hybrid offspring. An offspring is heterotic if its traits are enhanced as a result of mixing the genetic contributions of ...
The Strenuous Life. " The Strenuous Life " is the name of a speech given by the then New York Governor, later the 26th President of the United States, Theodore Roosevelt in Chicago, Illinois, on April 10, 1899. Based upon his personal experiences, he argued that strenuous effort and overcoming hardship were ideals to be embraced by Americans ...