How Much Cardio Actually Protects Your Heart?
Key takeaways
- A study following more than 17,000 adults for nearly 8 years found that hitting the standard 150-minutes-a-week exercise guideline was linked to only a modest reduction in cardiovascular risk.
- Substantial protection — a risk reduction of more than 30% — showed up at 560 to 610 minutes of moderate-to-vigorous activity per week, three to four times the standard recommendation.
- Only about 12% of participants reached that higher activity level, suggesting there's a meaningful gap between the guideline most people know and the amount linked to bigger benefits.
The gap between "meeting the guideline" and "getting the full benefit"
This study tracked over 17,000 adults, averaging 57 years old, for an average of nearly eight years. Each person wore a wrist device for a week to capture real-world activity levels, and completed a cycling test to estimate cardiorespiratory fitness — essentially, how efficiently the heart, lungs, and muscles work together during exertion.
People who met the widely cited benchmark of 150 minutes of moderate-to-vigorous activity per week — things like brisk walking, running, or cycling — saw their cardiovascular risk drop by about 8% to 9%. That's a real benefit, and it held up consistently across fitness levels. But it's also a modest one relative to what showed up further along the activity curve.
Where the bigger payoff actually starts
The researchers, from Macao Polytechnic University, defined "substantial protection" as more than a 30% reduction in cardiovascular risk. That level of benefit was associated with 560 to 610 minutes (9.3 to 10.1 hours) of moderate-to-vigorous activity per week — a meaningfully higher bar than the standard guideline, and one only about 12% of participants actually reached.
That's a useful reframe: the 150-minute guideline looks less like a target to stop at and more like a floor. The researchers themselves described it as a reliable minimum for basic protection, distinct from the higher volume linked to optimal benefit.
Fitness level changes the math, a little
The study also looked at whether a person's baseline fitness changed how much exercise they needed. People with lower cardiorespiratory fitness needed somewhat more activity than highly fit participants to reach a comparable benefit — roughly 30 to 50 extra minutes per week for the same size of risk reduction. The researchers called this a "steeper challenge" for people starting from a more deconditioned baseline, which is a fair way to think about it: the same finish line, just a slightly longer run-up for some people.
A longevity lens: guidelines as a floor, not a ceiling
This is a good example of how public-health guidelines and personal optimization goals can diverge without contradicting each other. A guideline has to be achievable for a whole population, so it tends to describe a reasonable minimum. But for someone actively investing in their long-term healthspan, this data suggests there's real additional upside in pushing well past that minimum — provided it's sustainable and doesn't crowd out recovery, sleep, or other pillars of a balanced routine.
The researchers also floated the idea of personalized activity targets based on individual fitness level, rather than one number for everyone. That's consistent with where a lot of longevity thinking is heading: less "hit this universal number" and more "understand your own baseline and build from there."
The takeaway
Meeting the standard activity guideline is worthwhile and linked to a real, if modest, benefit. But this study suggests the bigger gains live further out — in the range of 560 to 610 weekly minutes of moderate-to-vigorous movement, well beyond what most people currently do. It's an observational study, so it can't prove cause and effect, but the pattern is a useful nudge: if you're already active, there may be more room to benefit from pushing a bit further than you'd assume.
References:
- Zhide Liang, Senyao Du, Shiao Zhao, Xianfei Wang, Qiang Yan, Baichao Xu, Sanfan Ng, Ziheng Ning. Joint non-linear dose–response associations of device-measured physical activity and cardiorespiratory fitness with cardiovascular disease: a cohort and Mendelian randomisation study. British Journal of Sports Medicine, 2026; bjsports-2025-111351 DOI: 10.1136/bjsports-2025-111351