The Claim

In adults with an average age of 62, sleep duration exceeding 9 hours per day, as measured by accelerometers, is not associated with an increased risk of incident cardiovascular disease or cardiovascular mortality when compared to sleep durations of 7 to 9 hours per day.

Source: Associations of Accelerometer-measured Sleep Duration with Incident Cardiovascular Disease and Cardiovascular Mortality.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
52score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

People who sleep more than 9 hours a night don’t seem to have a higher chance of heart problems or dying from heart issues than those who sleep 7 to 9 hours, at least based on how their sleep was tracked with a wrist device.

See the scientific wording

Sleep duration greater than 9 hours per day is not associated with increased risk of incident cardiovascular disease or cardiovascular mortality compared to 7–9 hours of sleep per day, based on accelerometer-measured sleep in adults aged 62 on average.

What the research says

1 study

  1. Study: Associations of Accelerometer-measured Sleep Duration with Incident Cardiovascular Disease and Cardiovascular Mortality.

    This study used wrist devices to track how long people slept and found that sleeping more than 9 hours didn’t increase heart disease risk, just like the claim says — but sleeping less than 7 hours did.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.