Staying Active Over Years Linked to 44% Lower Frailty Risk

The paper is a systematic review and meta-analysis. That means the authors searched for all suitable studies and pooled their results. It covers 10 prospective cohort studies, which follow people over time, with 111,714 community-dwelling adults in Europe, Asia and North America. Six of the 10 studies were combined in the statistical analysis. Because the studies are observational, they show an association. They do not prove that activity prevents frailty.

Frailty is a state of reduced reserve and greater vulnerability to stress. The authors link it to disability, loss of independence, hospitalization and death. They describe it as dynamic and potentially reversible, often preceded by a stage called pre-frailty.

The team, led by Sgouropoulou and colleagues, looked at activity over time rather than a single snapshot. They compared people with persistent activity, and people whose activity rose from low to higher levels, against people who stayed inactive. The studies had to track activity through repeated measurements or trajectories, and use a validated definition of frailty.

Persistent activity was linked to a 44% lower risk of frailty (risk ratio 0.56, 95% confidence interval 0.42 to 0.76). The authors rate their certainty in this result as moderate. Increasing activity was linked to a 38% lower risk (risk ratio 0.62, 95% confidence interval 0.57 to 0.68). Certainty there was low.

The authors also asked whether the age at which people started mattered. They compared groups below and above 60 at the start of follow-up. Results were similar in both. For readers in later life, that suggests the pattern held for those who were already past 60.

What does this mean for personal choices? The findings fit a simple message: regular activity that is kept up is linked to less frailty later, and rising activity was also linked to benefit. They do not set a specific amount or type of exercise.

There are limits. People who stay active may differ from inactive people in other ways, such as health, income or diet. The authors rated the inclining-activity evidence as low certainty. Pooling different studies also required assumptions, including treating odds ratios and hazard ratios as equivalent to risk ratios.

The result sits alongside, but is separate from, a piece The Arising ran on October 15 about scans of 100,000 patients and active brown fat. That was a different study on a different topic. Both report links with health, not proof of cause.

The authors call for implementation studies to measure whether public health policies that promote physically active lifestyles in midlife reduce the burden of frailty in aging populations. Those studies are what to watch next.

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