How To Avoid Late-Race Fatigue

  • By Mackenzie Lobby
  • Published Sep 9, 2015
  • Updated Sep 9, 2015 at 5:40 PM UTC
Photo: Janos Schmidt/

Want to avoid late-race run fatigue? The key is in better muscular endurance.

We’ve all been there. In the latter portion of a race, fatigue sets in, your form falls apart and your pace slows. While that efficient lope may have been effortless at the beginning of the running leg, a few miles in, it can start to feel difficult to even put one foot in front of the other. When your form begins to fail, your running economy—how efficiently your working muscles utilize oxygen to function at a specific pace—also takes a dive.

Research out of Northumbria University in England shed light on this link between running economy, fatigue and muscular endurance. Upon recruiting a group of runners, the researchers first tested their quad and hamstring muscular endurance strength. They then put them through two treadmill tests—one where they ran at a steady pace over a number of miles and the other during which they ran at VO2max pace for four minutes in the middle of the run.

Unsurprisingly, the participants’ running economy suffered a whole lot more in the second half of the run that included the high-intensity bout than the steady-state run. The researchers also found that their muscular endurance dictated how much running economy suffered. Those with higher muscular endurance maintained their running economy better than their weaker counterparts.

Mike Hamberger, a certified USA Track and Field coach and strength and conditioning specialist in Washington, D.C., explains this by saying that optimal muscular endurance allows proper form to be maintained throughout a long race or workout. “If form is correct, then there is less compensation happening with the mechanics,” he adds. “Less compensation means fewer unnecessary movements and less reliance on weaker muscles having to pick up the slack for the bigger muscles getting tired.”

RELATED: Heather Jackson’s Tips For A Strong Triathlon Run

This process, in turn, translates into less oxygen being required by the body to run at a given pace, which is where the boost in running economy comes. Rich Airey, a running and strength coach, and creator of, echoes this point, adding, “As you start to break down, the stronger the muscle fibers are, the longer you’ll be able to push. The key is to avoid breakdown in form.”

Put simply, it’s all about being strong enough to push back that point of fatigue as far as possible, especially in longer races. You can’t just strength train non-discriminately and get results, however. By focusing on the running muscles that do the most work, you’ll stave off that point of decreased running economy.

In particular, the muscles in the lower back, hips, hamstrings and glutes should be at the top of your list when it comes to strength work. “By strengthening these, you’ll also strengthen your core and improve posture,” Airey says. “All movement begins and ends with posture.”

Hamberger emphasizes the importance of the glutes since they work the hardest when a runner is maintaining good form. “Strong glutes allow the legs to move freely behind the runner during the recovery phase of the stride,” he explains. “Coupled with hip flexibility, this recovery action of the leg is what determines stride length, which, in turn, is what determines running speed.”

Click the tabs at the left for four exercises to improve muscular endurance.

RELATED: The Benefits Of A Strong Core

Come train (and race!) with us! We’re hosting the first ever Triathlete Magazine Training Camp Sept. 17-21 in San Diego, Calif. Learn more here.
Next »

FILED UNDER: Run / Training

Sign up for our free e-newsletter, SBR Report!

Subscribe to the FREE Triathlete newsletter