To make gains in fitness, daily consistent hard work to build training stress (and fatigue) is necessary in order to create the need for the body to adapt. How you adapt to the fatigue will solely depend on how you train, and what systems you targeted. Adapting, the part of training most commonly overlooked, all depends on how well you recover from the training fatigue you have accumulated. Individual responses to training stress may differ, depending on genetics and fitness levels; however, there will always be an individual limit to the level of fatigue that can be handled before you lose the ability to adapt to any amount of training stress.
The General Adaptation Syndrome, a three phase response to physiological stress, was introduced by Canadian biologist Hans Selye in 1936. John Garhammer, Ph.D., a specialist in biomechanics and physiology, later took Hans Seley’s work and applied it to resistance training and exercise conditioning. The work of Selye and Garhammer established the groundwork for learning how the human body reacts to training stress, and more importantly, how it adapts.
Let’s discuss and apply the three phases of the General Adaptation Syndrome (the alarm, resistance and exhaustion phase) to endurance training.
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