Fuel Sources Supplementary Materials - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

50

Pages:

2
Author:

Mariam A. A.

Fuel Sources • • For sustained activity of moderate intensity is the preferred energy source, given the ample O2 availability Exercise intensity determines the contribution of different fuel sources used for ATP production. - As the duration of exercise increases, fatty acid oxidation will progressively increase and becomes the dominant fuel - But when the intensity of exercise increases the active muscle will start increasingly relying on glucose that is derived from intermuscular glycogen and blood-borne glucose ✓ This switch is beneficial as per litre of O2 consumed, carbohydrate will provide slightly more energy that lipids - During low-intensity activities, the body will use aerobic metabolism over anaerobic metabolism, because it is more efficient and produces larger amounts of ATP. Fatty acids are the primary energy source during low-intensity activity. - low-intensity activities are able to continue for a long time • • • At a given metabolic demand, the increased availability and utilization of fatty acids translate to lower rates of glucose oxidation and muscle gluconeogenesis muscle fatigue increases in almost direct proportion to the rate of depletion of muscle glycogen Transmission of the nerve signal through the neuromuscular junction, can diminish at least a small amount after intense prolonged muscle activity, thus further diminishing muscle contraction muscle leads to almost complete muscle fatigue within 1 or 2 minutes because of the loss of nutrient supply, especially the loss of oxygen.

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