Sports
Longer Stroke or Higher Cadence at the End of an Ironman?
Coach Wanderley Santos explains why overgliding when fatigue sets in can stall forward momentum in the swim.
In the final stretch of an Ironman swim, many triathletes try to lengthen their stroke to save energy. Appearing on Café com Tri, coach Wanderley Santos analyzes how fatigue affects stroke mechanics and explains why cadence is key to maintaining forward propulsion.
It is a familiar scene at long-course triathlon events: entering the final stretch of the 2.4-mile (3,800-meter) swim, an athlete feels the heavy toll of muscular fatigue and hears the advice to lengthen their stroke to glide further through the water. While the theory sounds good, practical application under extreme exhaustion divides coaches and high-performance athletes.
On the show Café com Tri, produced by Stemma Sports, coach Wanderley Santos broke down this dynamic. He explained that choosing between prioritizing stroke length or maintaining a higher cadence at the end of the race depends heavily on the swimmer's technical skill and how their body reacts to losing postural efficiency under fatigue.
PUBLICIDADE (GAM) — 1250x250
What Happens to the Body When Fatigue Hits
When muscle fatigue sets in during the swim leg, technical flaws quickly surface. Exhausted swimmers tend to lift their heads too high to breathe, causing the hips to drop and core engagement to weaken. Consequently, the legs splay open, creating a parachute effect that generates excessive hydrodynamic drag.
Another common mistake highlighted by Santos is shortening the hand entry. As shoulders grow heavy, the hand enters the water too close to the head, and extending the elbow underwater acts like a brake. In this sense, reaching forward upon entry helps restore proper stroke geometry, but it does not mean slowing down the cycle to force a glide.
The Myth of the Long Stroke at All Costs
There is a common belief that the longer the stroke and the fewer the stroke cycles, the more efficient the swimmer. This logic is often tied to metrics like SWOLF (a portmanteau of swim and golf), used by sports watches to calculate swimming efficiency by adding time and stroke count.
However, chasing an excessively long stroke when strength is already spent can backfire. Trying to hold a glide without muscular support creates dead spots in propulsion: as the leading arm rests out front without pulling, forward speed drops and the body starts to decelerate. Conversely, slightly increasing stroke rate lowers the raw force required per pull, keeping momentum continuous.
Individual Assessments in an Endless Pool
To identify each athlete's ideal zone, Santos conducts biomechanical assessments in the Endless Pool at Care Club. Holding a steady target pace (such as 1:30/100m), the coach adjusts water flow speeds and tests the swimmer across different stroke rates—from longer, lower cadences to faster turnover rates.
Cross-referencing the athlete's rate of perceived exertion with heart rate data reveals where they expend the least energy. For certain swimmers, turning the arms over faster results in lower cardiorespiratory strain and less mechanical wear, whereas others can maintain a long hold without dropping their hips.
Why Stroke Rate Sustains a Triathlete's Pace
For the vast majority of age-groupers tackling the full Ironman distance, technique is the first thing to break down in the final miles. Maintaining a high elbow, a firm catch, and an immaculate streamline under deep fatigue requires a swimming background that few triathletes possess.
When an athlete lacks the strength to hold that front-end leverage, forcing a long stroke causes them to lose their feel for the water and drop body position. In these scenarios, developing stroke rate during pool workouts provides an indispensable race-day tool: turning the arms over with rhythm to keep momentum going when fatigue sets in.
PUBLICIDADE (GAM) — 1250x250
