Repeated sprint training — short, maximal efforts separated by brief recovery — is a staple for athletes in sports that demand repeated bursts of speed: football, basketball, combat sports, racket sports. Adding a breath-hold component to that training has been studied for years as a way to push the body’s oxygen and carbon dioxide systems harder without needing an altitude chamber. A study published in the European Journal of Applied Physiology puts two different breath-hold approaches to the test against normal breathing, and the results say a lot about how these techniques actually behave under real training conditions.
Two ways to hold your breath during a sprint
Ten healthy, physically active men completed three separate sprint sessions on a stationary bike, each with a different breathing pattern. In one session they breathed normally. In another, they used voluntary hypoventilation at low lung volume — exhaling down toward residual volume, holding there through the sprint, and taking one quick breath mid-sprint if needed. In the third, they held their breath at the end of a normal exhalation and kept holding for as long as they physically could, breaking only when they had to.
Each session consisted of two sets of eight sprints, with the sprint length fixed at ten seconds for the normal-breathing and low-lung-volume sessions. For the breath-hold-to-the-limit session, sprint length was determined entirely by how long each person could hold their breath.
The oxygen and CO2 numbers told a clear story
Both breath-hold techniques pushed blood oxygen saturation down and carbon dioxide up compared to normal breathing. Time spent below 96% oxygen saturation jumped from about 11 seconds during normal breathing to over a minute in both breath-hold conditions. End-tidal CO2 followed the same pattern, running noticeably higher whenever breathing was restricted. Interestingly, the two breath-hold methods produced almost identical hypoxic and CO2 stress — despite requiring very different amounts of effort to sustain.
Where the two techniques split apart: training load
This is where the study gets genuinely useful for anyone thinking about programming breath-hold work. The low-lung-volume method held up well: participants could still complete close to their full ten-second sprints, so total training volume stayed roughly on par with normal breathing. The hold-to-the-limit method told a different story. Most participants couldn’t sustain a breath-hold much past six or seven seconds, even after practice. That shaved their cumulative sprint time down by roughly a third across both sets, and total work dropped accordingly — even though their power output, while it lasted, was actually higher.
In other words: hold-to-the-limit breath-holding delivers a comparable metabolic hit, but it does so by shortening the work itself, not by making the work harder to sustain. For a training block built around volume and repeatability, that’s a meaningful difference.
Muscle and heart responses didn’t move as expected
Muscle oxygenation, tracked at the thigh with near-infrared spectroscopy, showed smaller swings between oxygenated and deoxygenated states during the hold-to-the-limit sprints compared to the other two conditions — likely a direct consequence of the shorter sprint duration rather than the breath-hold itself. Cardiac output and stroke volume, meanwhile, stayed statistically similar across all three sessions, which runs against some earlier work suggesting breath-hold training reliably boosts stroke volume through the “big breath” that follows a hold. The researchers point to a plausible explanation: the same forceful breathing maneuvers that make these techniques work may also interfere with the accuracy of the cardiac monitoring equipment during maximal effort.
What this means for breath-hold training in practice
The takeaway isn’t that one technique is simply better than the other — it’s that they behave differently under load. Voluntary hypoventilation at low lung volume manages to raise hypoxic and hypercapnic stress while keeping the actual training volume intact, which makes it the more practical option when the goal is to combine breath-hold stress with a full sprint session. Holding the breath to the limit gets you to a similar physiological place, just by a different route — one that costs volume along the way. Whether that trade-off is worth it likely depends on what the session is trying to achieve: raw metabolic stress, or stress without sacrificing training load.
As with most research in this space, the sample here was small — ten men, three sessions each — so these findings describe acute responses rather than long-term training outcomes. Still, it’s a useful data point for understanding how different breath-hold strategies actually play out once you put them under the demands of repeated, all-out effort.
How the Wim Hof Method approaches breath-holding
The Wim Hof Method works the same physiological territory this study is exploring — controlled hypoxia and CO2 tolerance — but with a structure of its own: rounds of deep breathing followed by a breath-hold on the exhale, done seated, before the physical effort even begins. It’s a distinct protocol from the ones tested here, built and refined around this same underlying principle. Studies like this one help map, with increasing precision, ground that practices like WHM’s have been exploring for years — what happens to the body when it’s trained, in a controlled way, to stay steady with less oxygen and more CO2.
