If someone goes on a long hike,after 4 hours most of his or her energy will be obtained from

Name: If someone goes on a long hike,after 4 hours most of his or her energy will be obtained from
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In long-term,moderate-intensity exercise,the muscles use more fatty acids and less glucose and glycogen.Amino acids may used to provide glucose for the brain when glucose and glycogen stores are depleted,but they would not be the major source of energy for working muscles.

If Someone Goes on a Long Hike,after 4 Hours Most