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Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
Published on: March 7, 2019
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Association between accelerometer-derived physical activity and incident cardiac arrest.
Shuangfa Qiu1,2, Zhenhua Xing1,2
1Department of Emergency Medicine, Second Xiangya Hospital, Central South University, No. 139 Mid-Renmin Road, Changsha 410011, China.
Summary
Regular physical activity (PA), especially moderate-to-vigorous activity, significantly lowers cardiac arrest (CA) risk. This protective effect is more pronounced in women than men.
Area of Science:
- Cardiology
- Epidemiology
- Exercise Science
Background:
- Cardiac arrest (CA) is a critical health concern with significant mortality.
- Previous research has focused on acute cardiovascular outcomes, with limited investigation into objectively measured physical activity (PA) and CA risk.
- Understanding the dose-response relationship between different intensities of PA and CA is crucial for public health guidelines.
Purpose of the Study:
- To examine the relationship between accelerometer-measured physical activity (PA) intensity and cardiac arrest (CA) risk.
- To determine the dose-response curve for light (LPA), moderate (MPA), and vigorous physical activity (VPA) in relation to CA.
- To investigate potential sex differences in the association between PA and CA.
Main Methods:
- Prospective cohort study of 98,893 UK Biobank participants.
- PA data collected using wrist-worn accelerometers, measuring total volume, LPA, MPA, and VPA.
- Incident CA identified via diagnostic codes; Cox proportional hazard models with restricted cubic splines analyzed associations, including sex differences.
Main Results:
- A total of 282 incident CAs were recorded during a median follow-up of 7.31 years.
- Total PA was inversely associated with CA risk.
- CA risk decreased significantly with increasing MPA and VPA up to approximately 360 min/week and 20 min/week, respectively; LPA showed no association.
- A stronger inverse association between PA and CA risk was observed in women compared to men.
Conclusions:
- Objectively measured PA, particularly moderate and vigorous intensity, is associated with a reduced risk of cardiac arrest.
- The protective effect of PA against CA is dose-dependent, with diminishing returns after certain thresholds for MPA and VPA.
- Women appear to benefit more from PA in terms of cardiac arrest risk reduction compared to men.
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