How can we influence the dominant metabolic pathway conditioned during interval training?

• A. By varying the duration of the work and rest interval and number of repetitions.
• B. By performing only long, slow intervals.
• C. By increasing resistance but not changing duration.
• D. By training only once per week.

Answer: (A)

Metabolic conditioning during interval training is shaped by how you structure work and rest and how often you repeat the efforts. Short, very hard efforts with proper recovery stress the phosphagen system and fast glycolysis, while longer efforts with shorter recovery push glycolysis more and, over time, can shift toward greater oxidative contribution as recovery becomes limiting. By varying how long you work, how long you rest, and how many repetitions you perform, you actively bias which energy systems are stressed and thus conditioned across sessions.

Simply increasing resistance without changing the duration of the work or rest doesn’t give you targeted control over the dominant pathway, and performing only long, slow intervals or training only once per week provides a less effective stimulus for metabolic adaptation.