FITNESS OF THE DAY Why are we tired during a High Intensity Workout ? High intensity exercises relies on using anaerobic pathway (without the presence of oxygen). The volume of ATP (Adenosine TriPhosphate, energy molecules) for anaerobic exercise comes from glycolysis. The glycolytic process requires that muscle cells breakdown glycogen to glucose via the glycogen phosphorylase pathway 2. However, in high intensity anaerobic exercise, above 80% of the maximum of heart rate. The body initially uses up all of the glycogen in the skeletal muscle and the liver through the glycolysis pathway, creating buildup of lactic acid. There are two mechanisms of muscle fatigue that limit action in high intensity training: fatigue due: 1. to depletion of phosphocreatine, 2. due to the high level of lactic acid induced muscle acidification 3. During interval training sessions such as circuit training, boot camp, crossfit, respecting the recovery time is necessary, avoiding in building up high concentration of lactic acid that might leads to an extreme fatigue, out of breath, unable to continue the training session, and the goal wont be achieved. Nicolas Yazigi MFS Health, Fitness and Wellness Specialist Exercise Science Lecturer Sports and Fitness Columnist
Posted on: Sun, 31 Aug 2014 18:05:50 +0000
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