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Mirage NewsScience14 Aug 2026 12:58 am AESTDate Time
Brief bursts of intense exercise trigger a molecular response linked to a lower risk of cardiovascular and metabolic disease and that are associated with slower biological aging. (Credit: Aflo images)
Three minutes of sprinting can do something that 90 minutes of moderate exercise apparently cannot: dramatically reshape the molecular contents of the bloodstream
Rockefeller researchers comparing different intensities of exercise found that six sets of 30-second, all-out sprints altered nearly a quarter of the proteins measured immediately afterward. Moderate, continuous cycling for 90 minutes altered fewer than one-quarter of one percent. And while moderate running on a treadmill changed more proteins than cycling, it still altered far fewer than a quick sprint
Sprinting triggered changes in more than 200 metabolites. It also caused an immediate surge of proteins involved in blood-vessel growth, tissue remodeling, and hormonal signaling. Some of these proteins appear to enter the bloodstream through an expedited cell signaling process known as ectodomain shedding-rather than being newly made and secreted, portions of proteins already sitting on the cell surface were cleaved off and rapidly released into circulation. The researchers also found that human fat cells exposed to blood collected after sprinting underwent extensive changes in gene activity, shifting how the cells process fuel, respond to hormones, and sense nutrient availability.
Not so with moderate exercise which produced a more modest response. It was not until three hours after completing that exercise that a meaningful wave of the fatty acids and liver-derived proteins that typically appear in response to the demands of endurance exercise were found in the bloodstream. Human fat cells exposed to blood collected after moderate cycling had only minor changes in gene activity
When the researchers compared the exercise-responsive proteins with health data from more than 53,000 people in the UK Biobank, they found that many of these proteins were associated with a lower risk of cardiovascular and metabolic disease. The connection was particularly striking for obesity, type 2 diabetes, and other metabolic disorders: of 33 proteins associated with lower risk, 32 were altered by sprinting, compared with just three by moderate exercise. More than a quarter of these proteins were also associated with slower biological aging.
“What’s exciting here is that just a few minutes of intense exercise can trigger a significant molecular response,” says Paul Cohen, head of the Weslie R. and William H. Janeway Laboratory of Molecular Metabolism at Rockefeller. “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.”
“It’s well appreciated that different intensities of exercise stimulate distinct body-wide adaptations,” notes Luke Olsen, the postdoctoral fellow who conducted the studies. “However, the molecular mechanisms linking these intensity-dependent adaptations have remained largely elusive. Our work suggests that exerkines-proteins and metabolites released into the bloodstream following exercise-are highly sensitive to exercise intensity and may be the key mediators of the health-promoting effects of short bursts of vigorous exercise.”
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