Search results for: Mark Hamer

Items from 1 to 20 out of 146 results

article

The Effect of Using Anchored Wake Time to Derive 24‐h Device Measured Circadian Physical Behavior Patterns

Malcolm H. Granat, Matthew N. Ahmadi, Emmanuel Stamatakis, Mark Hamer

Scandinavian Journal of Medicine & Science in Sports > 34 > 7 > n/a - n/a

Introduction Tailoring physical activity interventions to individual chronotypes and preferences by time of day could promote more effective and sustainable behavior change; however, our understanding of circadian physical behavior patterns is very limited. Objective To characterize and compare 24‐h physical behavior patterns expressed relative to clock time (the standard measurement of time‐based...

article

Association between device‐measured stepping behaviors and cardiometabolic health markers in middle‐aged women: The Australian Longitudinal Study on Women's Health

Le Wei, Matthew N. Ahmadi, Hsiu‐Wen Chan, Sebastien Chastin, more

Scandinavian Journal of Medicine & Science in Sports > 33 > 8 > 1384 - 1398

The associations between different types and contexts of stepping behaviors and cardiometabolic (CM) health markers are unclear. This study aimed to examine the associations of daily total, walking, stair, incidental and purposeful steps with cardiometabolic risk. A total of 943 women (mean age ± SD = 44.1 ± 1.6 years) from the Australian Longitudinal Study on Women's Health (ALSWH) were included...

article

Bidirectional associations of sleep and discretionary screen time in adults: Longitudinal analysis of the UK biobank

Hugues Sampasa‐Kanyinga, Jean‐Philippe Chaput, Bo‐Huei Huang, Mitch J. Duncan, more

Journal of Sleep Research > 32 > 2 > n/a - n/a

The direction of the association between discretionary screen time (DST) and sleep in the adult population is largely unknown. We examined the bidirectional associations of DST and sleep patterns in a longitudinal sample of adults in the general population. A total of 31,361 UK Biobank study participants (52% female, 56.1 ± 7.5 years) had two repeated measurements of discretionary screen time (TV...

article

Dose‐response association between step count and cardiovascular disease risk markers in middle‐aged adults

Mark Hamer, Joanna M. Blodgett, Emmanuel Stamatakis

Scandinavian Journal of Medicine & Science in Sports > 32 > 7 > 1161 - 1165

Several step‐based daily targets have been widely circulated, but there is a lack of empirical population‐based evidence to support such guidance. We examined dose‐response associations between step count and classical CVD risk markers (glycated hemoglobin, high density lipoprotein cholesterol, triglycerides, and C‐reactive protein) in 4665 adults (aged 46 years; 51.4% female) in a cross‐sectional...

article

The step count conundrum

Mark Hamer, Joanna M. Blodgett

Journal of Internal Medicine > 291 > 4 > 395 - 396

article

Estimating changes in physical behavior during lockdowns using accelerometry‐based simulations in a large UK cohort

Craig Speirs, Malcolm Granat, Emmanuel Stamatakis, Mark Hamer

Scandinavian Journal of Medicine & Science in Sports > 31 > 12 > 2221 - 2229

To contain the recent COVID‐19 outbreak, restrictions have been imposed, which has limited outdoor activity. These physical behavior changes can have serious health implications, but there is little objective information quantifying these changes. This study aimed to estimate the change in physical behavior levels during full lockdown conditions using objective data collected from a thigh‐worn activity...

article

Early childhood weight gain: Latent patterns and body composition outcomes

Tom Norris, Liina Mansukoski, Mark S. Gilthorpe, Mark Hamer, more

Paediatric and Perinatal Epidemiology > 35 > 5 > 557 - 568

Background Despite early childhood weight gain being a key indicator of obesity risk, we do not have a good understanding of the different patterns that exist. Objectives To identify and characterise distinct groups of children displaying similar early‐life weight trajectories. Methods A growth mixture model captured heterogeneity in weight trajectories between 0 and 60 months in 1390 children...

article

Childhood Obesity and Device‐Measured Sedentary Behavior: An Instrumental Variable Analysis of 3,864 Mother–Offspring Pairs

Mark Hamer, Sebastien Chastin, Russell M. Viner, Emmanuel Stamatakis

Obesity > 29 > 1 > 220 - 225

Objective Intergenerational data on mother–offspring pairs were utilized in an instrumental variable analysis to examine the longitudinal association between BMI and sedentary behavior. Methods The sample included 3,864 mother–offspring pairs from the 1970 British Cohort Study. Height and weight were recorded in mothers (age 31 [5.4] years) and offspring (age 10 years) and repeated in offspring...

article

Associations of sitting and physical activity with grip strength and balance in mid‐life: 1970 British Cohort Study

Rachel Cooper, Emmanuel Stamatakis, Mark Hamer

Scandinavian Journal of Medicine & Science in Sports > 30 > 12 > 2371 - 2381

Strength and balance training are now recommended in many physical activity (PA) guidelines. However, it is unclear whether these recommendations are applicable to middle‐aged adults. We aimed to examine the associations of sitting and physical activity times with grip strength and standing balance performance in mid‐life. Up to 4726 participants from the 1970 British Cohort study, with data on sitting...

article

Does adequate physical activity attenuate the associations of alcohol and alcohol‐related cancer mortality? A pooled study of 54 686 British adults

Yingyu Feng, Lauren Powell, Amy Jo Vassallo, Mark Hamer, more

International Journal of Cancer > 147 > 10 > 2754 - 2763

The potential of physical activity (PA) to attenuate the effects of alcohol consumption on the risks of alcohol‐related cancer mortality is unknown. We used data from participants aged 30 years and over in 10 British population‐based surveys (Health Surveys for England 1994, 1997, 1998, 1999, 2003, 2004, 2006 and 2008 and the Scottish Health Surveys 1998 and 2003). Alcohol‐related cancer mortality...

article

Out‐of‐home care in childhood and biomedical risk factors in middle‐age: National birth cohort study

Carlos Mestral, Steven Bell, Mark Hamer, George David Batty

American Journal of Human Biology > 32 > 3 > n/a - n/a

Objective With there being an apparent impact of experience of out‐of‐home care in childhood on chronic disease and mortality, we examined how such adversity might be embodied such that it has a measurable impact on human biology, so mediating this relationship. Methods We used data from the UK National Child Development Study in which exposure to public care was prospectively gathered on three...

article

Response to the letter titled “Double counting individuals in meta‐analysis artificially inflates precision”

Po‐Wen Ku, Mark Hamer, Ming‐Chun Hsueh, Li‐Jung Chen

Scandinavian Journal of Medicine & Science in Sports > 30 > 6 > 1085 - 1086

article

Estimated cardiorespiratory fitness in childhood and cardiometabolic health in adulthood: 1970 British Cohort Study

Mark Hamer, Gary O’Donovan, G. David Batty, Emmanuel Stamatakis

Scandinavian Journal of Medicine & Science in Sports > 30 > 5 > 932 - 938

Background Associations of cardiorespiratory fitness in childhood and adulthood with adult cardiometabolic risk factors are poorly understood, not least because of the paucity of studies. Objectives We investigated associations between nonexercise testing cardiorespiratory fitness (NETCRF) in childhood/adulthood and cardiometabolic risk factors in adulthood. Methods Based on an established algorithm...

article

Association of Changes in Physical Activity and Incidence and Remission of Overall and Abdominal Obesity in 113,950 Adults

David Martinez‐Gomez, Mark Hamer, Francisco B. Ortega, Verónica Cabanas‐Sanchez, more

Obesity > 28 > 3 > 660 - 668

Objective This study examined the dose‐response relationship between changes in physical activity (PA) and subsequent incidence or remission of overall and abdominal obesity. Methods A total of 113,950 healthy individuals aged ≥ 18 years participating in the Taiwan MJ Cohort were included. Two‐year changes in PA between the first and second examination were linked to subsequent development and...

article

Device‐measured light‐intensity physical activity and mortality: A meta‐analysis

Po‐Wen Ku, Mark Hamer, Yung Liao, Ming‐Chun Hsueh, more

Scandinavian Journal of Medicine & Science in Sports > 30 > 1 > 13 - 24

Introduction The association of light‐intensity physical activity (LPA) with mortality is poorly understood. This meta‐analysis of cohort studies aimed to examine the dose‐response relationships between daily device‐measured LPA and mortality in adults aged 18 or older and to explore whether the associations were independent of moderate‐to‐vigorous physical activity (MVPA). Methods Searches for...

article

Associations between objectively assessed and questionnaire-based sedentary behaviour with body mass index and systolic blood pressure in Kuwaiti adolescents

Rawan Hashem, Juan Pablo Rey-Lόpez, Mark Hamer, Anne McMunn, more

BMC Research Notes > 2019 > 12 > 1 > 1-6

Objective Kuwait has one of the highest obesity rates in the world. This study examined the associations between sedentary behaviour (objectively measured and self-reported), adiposity and systolic blood pressure in a sample of adolescents residing in Kuwait. Data was obtained from the Study of Health and Activity among adolescents in Kuwait (2012–2013). The sample included a total of 435 adolescents...

article

Targeting myeloid-derived suppressor cells in combination with primary mammary tumor resection reduces metastatic growth in the lungs

Momir Bosiljcic, Rachel A. Cederberg, Melisa J. Hamilton, Nancy E. LePard, more

Breast Cancer Research > 2019 > 21 > 1 > 1-16

Background Solid tumors produce proteins that can induce the accumulation of bone marrow-derived cells in various tissues, and these cells can enhance metastatic tumor growth by several mechanisms. 4T1 murine mammary tumors are known to produce granulocyte colony-stimulating factor (G-CSF) and increase the numbers of immunosuppressive CD11b⁺Gr1⁺ myeloid-derived suppressor cells (MDSCs) in tissues...

article

Comparison of physical behavior estimates from three different thigh-worn accelerometers brands: a proof-of-concept for the Prospective Physical Activity, Sitting, and Sleep consortium (ProPASS)

Patrick Crowley, Jørgen Skotte, Emmanuel Stamatakis, Mark Hamer, more

International Journal of Behavioral Nutrition and Physical Activity > 2019 > 16 > 1 > 1-7

Background Pooling data from thigh-worn accelerometers across multiple studies has great potential to advance evidence on the health benefits of physical activity. This requires harmonization of information on body postures, physical activity types, volumes and time patterns across different brands of devices. The aim of this study is to compare the physical behavior estimates provided by three different...

article

Handgrip strength, inflammatory markers, and mortality

Lee Smith, Lin Yang, Mark Hamer

Scandinavian Journal of Medicine & Science in Sports > 29 > 8 > 1190 - 1196

Purpose To investigate the extent to which inflammatory markers explain the association between handgrip strength and mortality. Methods Analyses of data from The English Longitudinal Study of Ageing. Handgrip strength and inflammatory marker data (C‐reactive protein and fibrinogen) were collected at baseline (2004/5) and inflammatory marker data at follow‐up (2012/13). Participant data were linked...

article

Associations between social isolation, loneliness, and objective physical activity in older men and women

Stephanie Schrempft, Marta Jackowska, Mark Hamer, Andrew Steptoe

BMC Public Health > 2019 > 19 > 1 > 1-10

Background The impact of social isolation and loneliness on health risk may be mediated by a combination of direct biological processes and lifestyle factors. This study tested the hypothesis that social isolation and loneliness are associated with less objective physical activity and more sedentary behavior in older adults. Methods Wrist-mounted accelerometers were worn over 7 days by 267 community-based...

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INFONA - science communication portal

Search results for: Mark Hamer

The Effect of Using Anchored Wake Time to Derive 24‐h Device Measured Circadian Physical Behavior Patterns

Association between device‐measured stepping behaviors and cardiometabolic health markers in middle‐aged women: The Australian Longitudinal Study on Women's Health

Bidirectional associations of sleep and discretionary screen time in adults: Longitudinal analysis of the UK biobank

Dose‐response association between step count and cardiovascular disease risk markers in middle‐aged adults

The step count conundrum

Estimating changes in physical behavior during lockdowns using accelerometry‐based simulations in a large UK cohort

Early childhood weight gain: Latent patterns and body composition outcomes

Childhood Obesity and Device‐Measured Sedentary Behavior: An Instrumental Variable Analysis of 3,864 Mother–Offspring Pairs

Associations of sitting and physical activity with grip strength and balance in mid‐life: 1970 British Cohort Study

Does adequate physical activity attenuate the associations of alcohol and alcohol‐related cancer mortality? A pooled study of 54 686 British adults

Out‐of‐home care in childhood and biomedical risk factors in middle‐age: National birth cohort study

Response to the letter titled “Double counting individuals in meta‐analysis artificially inflates precision”

Estimated cardiorespiratory fitness in childhood and cardiometabolic health in adulthood: 1970 British Cohort Study

Association of Changes in Physical Activity and Incidence and Remission of Overall and Abdominal Obesity in 113,950 Adults

Device‐measured light‐intensity physical activity and mortality: A meta‐analysis

Associations between objectively assessed and questionnaire-based sedentary behaviour with body mass index and systolic blood pressure in Kuwaiti adolescents

Targeting myeloid-derived suppressor cells in combination with primary mammary tumor resection reduces metastatic growth in the lungs

Comparison of physical behavior estimates from three different thigh-worn accelerometers brands: a proof-of-concept for the Prospective Physical Activity, Sitting, and Sleep consortium (ProPASS)

Handgrip strength, inflammatory markers, and mortality

Associations between social isolation, loneliness, and objective physical activity in older men and women

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