Sitting Too Much Linked to Heart Disease, Even for Those Who Work Out, Study Finds

A new study has revealed that prolonged sitting can significantly increase the risk of heart disease, even for individuals who exercise regularly. Published in the Journal of the American College of Cardiology, the research underscores the dangers of excessive sedentary behavior and its impact on cardiovascular health.

Dr. Ezim Ajufo, a cardiology fellow at Brigham and Women’s Hospital in Boston and the study’s lead author, emphasized the findings. “Our results highlight the importance of avoiding excess sitting, regardless of physical activity levels,” she stated.

The study analyzed data from nearly 90,000 participants who wore accelerometers for a week to track their sedentary and active periods. Researchers then compared this data to later diagnoses of conditions such as stroke, heart attack, and heart failure. The findings showed a clear association between increased sedentary time and heightened cardiovascular risk, offering insights into what might constitute excessive sitting.

Dr. Keith Diaz, associate professor of behavioral medicine at Columbia University Medical Center, explained the broader implications of the study. While it is well understood that prolonged sitting is harmful, he noted the need for precise guidelines to define safe activity levels. Diaz praised the study for its robust methodology and large sample size, which provided valuable data on the risks of sitting.

According to the study, sitting for more than 10.6 hours per day may significantly elevate cardiovascular risks. “That’s not a hard-and-fast threshold,” said Ajufo, “but it’s a reasonable starting point for public health recommendations.”

The study utilized data from the UK Biobank, a large biomedical database that tracks individuals over time. However, Ajufo acknowledged that the sample—predominantly White and of European ancestry—may limit its applicability to more diverse populations, including in the United States.

While the study did not establish a direct causal relationship between sitting and heart disease, Diaz noted that the findings align with biological reasoning. He explained that movement stimulates muscles, which are essential for regulating blood sugar and fat levels in the bloodstream. Without regular movement, these processes can be disrupted.

To counteract the effects of prolonged sitting, Diaz recommended taking short movement breaks throughout the day. “Even just a few minutes of walking every 30 to 60 minutes can provide the stimulation muscles need to function properly,” he said. Tools like treadmill or bike desks may also help integrate movement into daily routines.

The study also dispelled the notion that exercise alone can offset the risks of sedentary behavior. Ajufo stressed that while regular workouts are beneficial, they cannot completely neutralize the adverse effects of extended sitting. “Moderate to vigorous physical activity—like running or brisk walking—is not enough to undo the harm caused by sitting for long periods,” she explained. However, she added that exercising still offers advantages compared to leading a completely sedentary lifestyle.

Ultimately, the study highlights the need for both consistent exercise and efforts to break up sedentary time to maintain heart health