Am Heart J
August 2025
Background: The impact of low-density lipoprotein cholesterol (LDL-C) on atherosclerotic cardiovascular disease (ASCVD) risk is influenced by both the magnitude and duration of exposure. Patients with nonobstructive coronary artery disease (NOCAD) and a CT-adapted Leaman score (CT-LeSc) >5 have a higher risk of cardiac events. The CT-LeSc semi-quantitatively assesses total coronary atherosclerotic burden via coronary computed tomography angiography (CCTA).
View Article and Find Full Text PDFCausal mediation analysis decomposes the total effect of an exposure on an outcome into: 1. the indirect effect through a mediator and 2. the remaining "direct" effect through all other pathways.
View Article and Find Full Text PDFBackground: Step counting is comparable among many research-grade and consumer-grade accelerometers in laboratory settings.
Objective: The purpose of this study was to compare the agreement between Actical and Apple Watch step-counting in a community setting.
Methods: Among Third Generation Framingham Heart Study participants (N=3486), we examined the agreement of step-counting between those who wore a consumer-grade accelerometer (Apple Watch Series 0) and a research-grade accelerometer (Actical) on the same days.
Causal indirect and direct effects provide an interpretable method for decomposing the total effect of an exposure on an outcome into the indirect effect through a mediator and the direct effect through all other pathways. A natural choice for a mediator in a randomized clinical trial is the treatment's targeted biomarker. However, when the mediator is a biomarker, values can be subject to an assay lower limit.
View Article and Find Full Text PDFIntroduction: Cardiometabolic risk factors and epigenetic patterns, increased in physically inactive individuals, are associated with an accelerated brain aging process.
Objective: To determine whether cardiometabolic risk factors and epigenetic patterns mediate the association of physical inactivity with unfavorable brain morphology.
Methods: We included dementia and stroke free participants from the Framingham Heart Study Third Generation and Offspring cohorts who had accelerometery and brain MRI data (n = 2,507, 53.
Background: Taking fewer than the widely promoted "10 000 steps per day" has recently been associated with lower risk of all-cause mortality. The relationship of steps and cardiovascular disease (CVD) risk remains poorly described. A meta-analysis examining the dose-response relationship between steps per day and CVD can help inform clinical and public health guidelines.
View Article and Find Full Text PDFMed Sci Sports Exerc
February 2023
Introduction/purpose: Physical activity may influence chronic disease risk, in part, through epigenetic mechanisms. Previous studies have demonstrated that an acute bout of physical activity can influence DNA methylation status. Few studies have explored the relationship between habitual, accelerometer-measured physical activity or sedentary time with epigenetic markers of aging.
View Article and Find Full Text PDFJ Am Heart Assoc
September 2022
Background Cardiorespiratory fitness is a powerful predictor of health outcomes that is currently underused in primary prevention, especially in young adults. We sought to develop a blood-based biomarker of cardiorespiratory fitness that is easily translatable across populations. Methods and Results Maximal effort cardiopulmonary exercise testing for quantification of cardiorespiratory fitness (by peak oxygen uptake) and profiling of >200 metabolites at rest were performed in the FHS (Framingham Heart Study; 2016-2019).
View Article and Find Full Text PDFBackground: Non-genetic factors contribute to differences in diabetes risk across race/ethnic and socioeconomic groups, which raises the question of whether effects of predictors of diabetes are similar across populations. We studied diabetes incidence in the primarily non-Hispanic White Framingham Heart Study (FHS, N = 4066) and the urban, largely immigrant Hispanic Community Health Study/Study of Latinos (HCHS/SOL, N = 6891) Please check if the affiliations are captured and presented correctly.
Methods: Clinical, behavioral, and socioeconomic characteristics were collected at in-person examinations followed by seven-day accelerometry.
Objective: To investigate whether indirect effects via psychological mechanisms explain the effects of physical therapy (PT) or yoga versus education on back-related outcomes.
Design: Mediation analyses using data from a randomized controlled trial of PT, yoga, and education interventions for chronic low back pain.
Methods: Primary outcomes were changes in back-related pain on the 11-point numeric rating scale and disability on the modified 23-point Roland-Morris Disability Questionnaire, measured at 52 weeks after randomization.
Lancet Public Health
March 2022
Background: Although 10 000 steps per day is widely promoted to have health benefits, there is little evidence to support this recommendation. We aimed to determine the association between number of steps per day and stepping rate with all-cause mortality.
Methods: In this meta-analysis, we identified studies investigating the effect of daily step count on all-cause mortality in adults (aged ≥18 years), via a previously published systematic review and expert knowledge of the field.
Background: Cardiorespiratory fitness is not limited by pulmonary mechanical reasons in the majority of adults. However, the degree to which lung function contributes to exercise response patterns among ostensibly healthy individuals remains unclear.
Methods: We examined 2314 Framingham Heart Study participants who underwent cardiopulmonary exercise testing (CPET) and pulmonary function testing.
Background: The joint associations of total and intensity-specific physical activity with obesity in relation to all-cause mortality risk are unclear.
Methods: We included 34 492 adults (72% women, median age 62.1 years, 2034 deaths during follow-up) in a harmonised meta-analysis of eight population-based prospective cohort studies with mean follow-up ranging from 6.
Eur Heart J
November 2021
Aims: While greater physical activity (PA) is associated with improved health outcomes, the direct links between distinct components of PA, their changes over time, and cardiorespiratory fitness are incompletely understood.
Methods And Results: Maximum effort cardiopulmonary exercise testing (CPET) and objective PA measures [sedentary time (SED), steps/day, and moderate-vigorous PA (MVPA)] via accelerometers worn for 1 week concurrent with CPET and 7.8 years prior were obtained in 2070 Framingham Heart Study participants [age 54 ± 9 years, 51% women, SED 810 ± 83 min/day, steps/day 7737 ± 3520, MVPA 22.
Cardiorespiratory fitness (CRF) is intricately related to health status. The optimal approach for CRF quantification is through assessment of peak oxygen uptake (VO), but such measurements have been largely confined to small referral populations. Here we describe protocols and methodological considerations for peak VO assessment and determination of volitional effort in a large community-based sample.
View Article and Find Full Text PDFBr J Sports Med
December 2020
Objectives: To examine the joint associations of accelerometer-measured physical activity and sedentary time with all-cause mortality.
Methods: We conducted a harmonised meta-analysis including nine prospective cohort studies from four countries. 44 370 men and women were followed for 4.
Objective: To examine the dose-response associations between accelerometer assessed total physical activity, different intensities of physical activity, and sedentary time and all cause mortality.
Design: Systematic review and harmonised meta-analysis.
Data Sources: PubMed, PsycINFO, Embase, Web of Science, Sport Discus from inception to 31 July 2018.