Sports
Pace Tests, Zones, and Lactate in Triathlon Swimming
Coach Wanderley Santos explains how the T-400 test and classic swim zones guide training for triathletes.
Understand how swim pace testing works, from the traditional T-400 to data interpolation and lactate protocols. Coach Wanderley Santos breaks down how classic pool zones translate to triathlon.
Setting training intensities and paces in the pool is a common challenge for coaches and triathletes, especially when managing crowded lanes of age-groupers with varying fitness levels. On the Café com Tri episode by Stemma Sports, coach Wanderley Santos detailed the testing methodologies he uses to prescribe precise swim workouts, ranging from simple field tests to laboratory lactate protocols.
PUBLICIDADE (GAM) — 1250x250
The T-400 table and threshold interpolation
To benchmark his athletes' workouts, Wanderley uses an adaptation of the traditional T-400 table—a 400-meter all-out time trial. This methodology was refined roughly two decades ago alongside coaches Felipe Domingues and Paulo Arruda (PA) when they served as managers at Companhia Atlética. The group adjusted percentages originally developed for elite swimmers to match the reality of amateur swimmers and triathletes.
While some coaches combine maximum efforts in the 200 meters (T-200) and 400 meters (T-400) to determine the anaerobic threshold via linear interpolation, Wanderley focuses testing on a single 400-meter effort. Based on the final test time, the table calculates equivalent paces for various pool set distances and intensities.
Training zones: classic swimming versus triathlon
The practical application of training paces often runs into naming discrepancies between sports. In triathlon and land-based endurance sports, efforts are typically categorized into numerical zones from Z1 to Z5 (or L1 and L2). In traditional competitive swimming, the classification uses specific acronyms that still cause confusion among athletes:
The aerobic scale begins at A0 (recovery and warm-down) and progresses through A1, A2, and A3. In the anaerobic ranges, classifications extend through AN1, AN2, and AN3 (short, intense efforts limited to 50- to 100-meter reps), culminating in AA (alactic anaerobic, targeting pure power and neuromuscular capacity in efforts lasting only a few seconds). Correlating these tables with perceived exertion ensures athletes execute each set at the intended intensity.
Lactate protocols and practical challenges
Another tool discussed for physiological precision is blood lactate testing during workouts. In partnership with physiologist Johnny from Care Club, Wanderley developed a sport-specific swim protocol, though he notes that wide-scale implementation for age-group triathletes faces logistical hurdles, such as requiring dedicated lanes and infrastructure for successive poolside blood sampling.
Classic in-water lactate protocols—such as those used in academic research at UFSCar—involve progressive, controlled 100- or 200-meter reps at fixed speeds (meters per second), with blood samples drawn after each repetition up to maximum effort to map an accurate metabolic curve.
PUBLICIDADE (GAM) — 1250x250
