What does this research mean for the field?

Higher physical activity fragmentation is associated with an increased risk of incident cardiovascular diseases independently of total physical activity volume. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To examine prospective associations between physical activity fragmentation, quantified by the active-to-inactive transition probability (AITP), and incident cardiovascular diseases.

July 8, 2026Nutrition JournalOpen Access

Accelerometer-measured physical activity fragmentation and incident cardiovascular diseases: a prospective cohort study

Q: What are the key findings of this study?

The highest quartile of physical activity fragmentation was associated with a 23% increased risk of composite cardiovascular disease compared to the lowest quartile (HR 1.23).

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: Cardiovascular disease (n=77571). Intervention: Physical activity fragmentation (active-to-inactive transition probability) vs. Lowest quartile of physical activity fragmentation. Primary outcome: Composite cardiovascular disease (incident heart failure, atrial fibrillation, and coronary heart disease) (HR 1.23, 95% CI 1.14-1.32, p=<0.05).

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Key result

Higher physical activity fragmentation is linked to ~23% increased composite CVD risk.

HR 1.23
95% CI 1.14-1.32
P<0.05
n=77,571

Why the study?

The study was conducted to examine the associations between accelerometer-measured active-to-inactive transition probability and incident cardiovascular diseases.

Does higher physical activity fragmentation increase the risk of incident cardiovascular diseases in adults?

Population

77,571 participants with accelerometer-measured physical activity data from the UK Biobank

Comparison

Quartiles of active-to-inactive transition probability

Design

Prospective cohort study

Follow-up

Median 7.7 years

Authors

HDHaiyang DongShanghai Public Health Clinical Center CHChuang HanShanghai Public Health Clinical Center YCYue ChenShanghai Public Health Clinical Center

Discussion

Member takes

Implication

Supports considering activity patterns beyond total volume in risk assessment; extends volume-focused evidence but remains hypothesis-generating.

Key Points

To examine prospective associations between physical activity fragmentation, quantified by the active-to-inactive transition probability (AITP), and incident cardiovascular diseases.
Prospective cohort study analyzing 77,571 participants (mean age 61.9 years, 58.2% women) from the UK Biobank with accelerometer-measured activity data.
AITP was calculated from acceleration data, and adjusted-AITP was derived using residuals from restricted cubic spline regression of AITP on total physical activity volume.
Cox proportional hazards models evaluated associations with incident heart failure (HF), atrial fibrillation (AF), coronary heart disease (CHD), and composite CVD over a median follow-up of 7.7 years.
Over a median follow-up of 7.7 years, 1133 incident HF, 2796 incident AF, 3514 incident CHD, and 5948 incident composite CVD cases were documented.
Compared with the lowest quartile of AITP, the highest quartile showed higher risks of incident HF (HR = 1.47, 95%CI: 1.25-1.72), AF (HR = 1.27, 95%CI: 1.14-1.41), CHD (HR = 1.18, 95%CI: 1.07-1.29), and composite CVD (HR = 1.23, 95%CI: 1.14-1.32).
Each interquartile range increase in AITP was associated with a 9-20% higher CVD risk; the highest quartile of volume-adjusted AITP maintained significant associations with AF (HR = 1.24, 95%CI: 1.12-1.38), CHD (HR = 1.11, 95%CI: 1.01-1.22), and composite CVD (HR = 1.14, 95%CI: 1.06-1.23).

Study Design

Type

Cohort (n=77,571)

Multicenter

Yes

Structured PICO

Does higher physical activity fragmentation increase the risk of incident cardiovascular diseases in adults?

Population

77,571 adults aged 40-69 years from the UK Biobank, free of prevalent cardiovascular disease at baseline, followed for a median of 7.7 years.

Exposure

Higher physical activity fragmentation (highest quartile of active-to-inactive transition probability [AITP])

Comparator

Lower physical activity fragmentation (lowest quartile of AITP)

Outcome

Incident heart failure (HF), atrial fibrillation (AF), coronary heart disease (CHD), and composite CVD (combined outcome of the first three diseases)hard clinical

Main Result

Hazard Ratio: 1.23 (95% CI 1.14–1.32)

p-value: p=<0.05

Higher physical activity fragmentation is associated with an increased risk of incident cardiovascular diseases, independent of total physical activity volume, suggesting its potential as a novel behavioral marker for CVD prevention.

Limitations

Residual confounding by unmeasured or subclinical health degeneration cannot be fully excluded.
Assessment of physical activity fragmentation was limited to a single week of measurement.
Healthy volunteer bias in the UK Biobank accelerometer subsample limits generalizability.
Time lag between baseline covariate collection and accelerometer measurements may introduce residual confounding.
Residual confounding by unmeasured or subclinical health degeneration cannot be fully excluded
Assessment of physical activity fragmentation was limited to a single week of measurement, potentially failing to capture long-term patterns
Healthy volunteer bias in the accelerometer subsample limits generalizability
Time lag between baseline covariates collection and accelerometer measurements may introduce residual confounding

Cite This Study

Dong et al. (2026) conducted a cohort in Cardiovascular disease (n=77,571). Physical activity fragmentation (active-to-inactive transition probability) vs. Lowest quartile of physical activity fragmentation was evaluated on Composite cardiovascular disease (incident heart failure, atrial fibrillation, and coronary heart disease) (HR 1.23, 95% CI 1.14-1.32, p=<0.05). The highest quartile of physical activity fragmentation was associated with a 23% increased risk of composite cardiovascular disease compared to the lowest quartile (HR 1.23).

synapsesocial.com/papers/6a4de7d8d2ea289ef6282cb3 https://doi.org/10.1186/s12937-026-01358-y

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Implication

Supports considering activity patterns beyond total volume in risk assessment; extends volume-focused evidence but remains hypothesis-generating.

Accelerometer-measured physical activity fragmentation and incident cardiovascular diseases: a prospective cohort study

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Limitations

Cite This Study

Accelerometer-measured physical activity fragmentation and incident cardiovascular diseases: a prospective cohort study

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Limitations

Cite This Study

Also Consider

Also Consider