Scientists identify 3-minute exercise that may outperform 90-minute workout

A workout lasting just a few minutes may have a far bigger impact on the body than many people realize, according to new research that found brief bursts of intense exercise triggered biological changes rarely seen after much longer sessions.

Scientists at Rockefeller University discovered that three minutes of sprinting produced a dramatic molecular response in the bloodstream, far exceeding the changes seen after 90 minutes of moderate exercise.

The findings, published by Rockefeller researchers, compared how the body responded to different exercise intensities. Participants completed six 30-second all-out sprints, while others undertook 90 minutes of moderate cycling or moderate treadmill running.

Study author Paul Cohen, the Albert Resnick, MD associate professor, told Newsweek: "Our work was designed to test whether different exercise modalities elicit distinct whole-body responses as assessed by measuring a very large panel of proteins, metabolites, and lipids in the bloodstream, which we found to be the case."

The number of runners and joggers in the United States generally hovers around 50 million, according to Statista, with millions more taking part globally.

In small, male-biased study cohorts, researchers found that sprinting altered nearly a quarter of all proteins measured in participants' blood immediately after exercise.

In contrast, 90 minutes of moderate cycling changed fewer than one-quarter of one percent of proteins. While moderate running produced a stronger molecular response than cycling, it still fell well short of the changes seen following sprinting.

What Happened After Sprinting?

The researchers found that sprinting triggered changes in more than 200 metabolites and caused an immediate rise in proteins involved in blood-vessel growth, tissue remodeling and hormonal signaling.

Some of these proteins appeared to enter the bloodstream through a process known as ectodomain shedding. Rather than being newly produced by cells, portions of proteins already positioned on the cell surface were rapidly released into circulation.

The effects did not stop there. Human fat cells exposed to blood collected after sprinting underwent extensive changes in gene activity, altering how the cells process fuel, respond to hormones and detect nutrient availability.

“What’s exciting here is that just a few minutes of intense exercise can trigger a significant molecular response,” Cohen said in a statement. “And we still see it after eight weeks of training, which tells us this response isn’t simply a product of the body struggling to keep up with unfamiliar stress. It may be that the responses we observed are intrinsic to intense exercise.”

Moderate exercise produced a much smaller response.

Researchers found that it took around three hours after moderate cycling for a meaningful wave of fatty acids and liver-derived proteins commonly associated with endurance exercise to appear in the bloodstream. Fat cells exposed to blood collected after moderate cycling showed only minor changes in gene activity.

Links to Better Health Outcomes

The team also examined health data from more than 53,000 people in the U.K. Biobank and compared it with the proteins affected by exercise.

Many of the proteins that responded to exercise were associated with a lower risk of cardiovascular and metabolic disease. The connection was especially strong for obesity, type 2 diabetes and other metabolic disorders.

Of 33 proteins associated with a lower risk of these conditions, 32 were altered by sprinting. Moderate exercise altered just three.

Researchers also found that more than a quarter of these proteins were linked to slower biological aging.

Cohen told Newsweek: "In general, the literature in the field does suggest that combining different types of exercise is a wise approach, though given many people's sedentary lifestyles, any type of physical activity and/or exercise is likely to provide some benefits."

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