Originally Posted by
terrymorse
While you can "survive" while exercising at a low intensity without taking in carbs, athletes performing at moderate or greater intensities benefit greatly from carb ingestion. There are much data to confirm this, going back decades.
Also, 10 g/hr is well below the ACSM guideline of 30-60 g/hr for endurance exercise greater than 1 hour.
There seems to be a consensus among researchers that aerobic exercise performed in zones 1 and 2 (using the 5-zone scale) burns fat almost exclusively, whereas exercise in zone 3 and above burns carbs at a rate that increases as the effort increases.
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