Expert profile
Dr. Andrew Coggan
Exercise physiologist and associate professor at Indiana University Purdue University Indianapolis (IUPUI); co-author of a book on power-based cycling training
Exercise metabolism • muscle fat and carbohydrate use • lactate threshold • training intensity • power-based training
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About the expert
Focus: How training intensity drives muscle adaptations, and why exercise zones are a communication tool rather than biology
Dr. Andrew Coggan is an exercise physiologist at Indiana University Purdue University Indianapolis who has spent decades studying muscle metabolism with training and tracer studies, and a former competitive time-trial cyclist. Emphasizes that the body's responses to exercise intensity form a continuum rather than distinct zones, and that broad principles such as specificity and overload matter more than precise zones. Draws primarily from classic exercise-metabolism research and his own studies; he co-wrote a widely sold book on training with power meters, and his framing is aimed mostly at endurance performance rather than health outcomes.