Wahoo 4DP Metrics: DTL, STL, LTL and Fitness Score Explained

Wahoo has rebuilt its fitness tracking around the 4DP model, replacing single-number FTP with four distinct power dimensions. The new metrics, DTL (Dimensional Training Load), STL (Short-Term Load), LTL (Long-Term Load), and Training Capacity, give cyclists a layered view of fatigue and readiness that one number simply cannot capture.

DTL is the core metric here. Instead of collapsing your effort into a single FTP-derived score, it tracks training stress across all four 4DP dimensions: Neuromuscular Power, Anaerobic Capacity, MAP, and FTP. That matters because a criterium effort and a four-hour gran fondo wreck your body in completely different ways, and a flat FTP load score treats them almost the same.

STL and LTL work like the acute and chronic load model you already know from tools like TrainingPeaks or Garmin's Training Load Focus. STL captures the last 7 days, LTL the rolling 42-day picture. The ratio between them signals whether you are building fitness or digging a fatigue hole. Wahoo's Training Capacity score then sits on top, functioning roughly like Garmin's Body Battery or Polar's Orthostatic Test output, but grounded in power-based data rather than HRV alone.

For athletes already using Wahoo's SYSTM platform, this is a meaningful upgrade over the old TSS-style single-axis load. It is not as hardware-agnostic as Garmin's ecosystem or as recovery-focused as Whoop, and Coros still edges it on GPS watch integration. But for SYSTM-trained cyclists who do structured work across sprint, threshold, and endurance zones, the multi-dimensional breakdown finally reflects how training actually stresses the body.

Solid system for dedicated Wahoo users. Not a reason to switch ecosystems, but a real step up from FTP-only tracking.