The double-threshold model is a structured intensity-distribution system, not a simple weekly-volume shortcut
Interpretation
Tønnessen et al.'s review of Norwegian elite-endurance practice describes double-threshold training as a deliberately structured approach to session placement and intensity distribution, built up over years of athlete development — not a single transferable rule that works independent of an athlete's training history and volume tolerance.
Practical implication
Don't present double-threshold training as a drop-in weekly template for age-group athletes. The evidence supports it as a model requiring progressive volume and session-structure literacy, which most recreational athletes haven't built.
Sources
1 source, independently verified.
Sports Medicine 54(11):2935-2953. Describes the double-threshold training model used by Norwegian elite endurance athletes as a structured intensity-distribution approach, not a simple weekly-volume rule.