Ian Janssen

ORCID: 0000-0003-2159-3012
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About
Contact & Profiles
Research Areas
  • Obesity, Physical Activity, Diet
  • Physical Activity and Health
  • Children's Physical and Motor Development
  • Health and Lifestyle Studies
  • Nutrition and Health in Aging
  • Urban Transport and Accessibility
  • Body Composition Measurement Techniques
  • Nutritional Studies and Diet
  • Sleep and related disorders
  • Injury Epidemiology and Prevention
  • Child Development and Digital Technology
  • Diabetes, Cardiovascular Risks, and Lipoproteins
  • Obesity and Health Practices
  • Impact of Technology on Adolescents
  • Cardiovascular and exercise physiology
  • Behavioral Health and Interventions
  • Mobile Health and mHealth Applications
  • Traffic and Road Safety
  • Sleep and Work-Related Fatigue
  • Eating Disorders and Behaviors
  • Urban Green Space and Health
  • Youth Development and Social Support
  • Diet and metabolism studies
  • Pharmacology and Obesity Treatment
  • Adipokines, Inflammation, and Metabolic Diseases

Queen's University
2015-2024

Kingston Health Sciences Centre
2008-2023

University of Toronto
2007-2022

Maastricht University
2003-2021

Maastro Clinic
2020

Maastricht University Medical Centre
2020

Children's Hospital of Eastern Ontario
2007-2018

Canadian Fitness and Lifestyle Research Institute
2007-2018

University of Alberta
2018

Government of Alberta
2018

The purpose was to: 1) perform a systematic review of studies examining the relation between physical activity, fitness, and health in school-aged children youth, 2) make recommendations based on findings.The limited to 7 indicators: high blood cholesterol, pressure, metabolic syndrome, obesity, low bone density, depression, injuries. Literature searches were conducted using predefined keywords 6 key databases. A total 11,088 potential papers identified. abstracts full-text articles...

10.1186/1479-5868-7-40 article EN cc-by International Journal of Behavioral Nutrition and Physical Activity 2010-01-01

OBJECTIVES: To establish the prevalence of sarcopenia in older Americans and to test hypothesis that is related functional impairment physical disability persons. DESIGN: Cross‐sectional survey. SETTING: Nationally representative cross‐sectional survey using data from Third National Health Nutrition Examination Survey (NHANES III). PARTICIPANTS: Fourteen thousand eight hundred eighteen adult NHANES III participants aged 18 older. MEASUREMENTS: The presence relationship between were examined...

10.1046/j.1532-5415.2002.50216.x article EN Journal of the American Geriatrics Society 2002-05-01

We employed a whole body magnetic resonance imaging protocol to examine the influence of age, gender, weight, and height on skeletal muscle (SM) mass distribution in large heterogeneous sample 468 men women. Men had significantly ( P < 0.001) more SM comparison women both absolute terms (33.0 vs. 21.0 kg) relative (38.4 30.6%). The gender differences were greater upper (40%) than lower (33%) 0.01). observed reduction starting third decade; however, noticeable decrease was not until end...

10.1152/jappl.2000.89.1.81 article EN Journal of Applied Physiology 2000-07-01

10.1093/ajcn/79.3.379 article EN publisher-specific-oa American Journal of Clinical Nutrition 2004-03-01

Leaders from the Canadian Society for Exercise Physiology convened representatives of national organizations, content experts, methodologists, stakeholders, and end-users who followed rigorous transparent guideline development procedures to create 24-Hour Movement Guidelines Children Youth: An Integration Physical Activity, Sedentary Behaviour, Sleep. These novel guidelines children youth aged 5–17 years respect natural intuitive integration movement behaviours across whole day (24-h...

10.1139/apnm-2016-0151 article EN cc-by Applied Physiology Nutrition and Metabolism 2016-06-01

Objectives: To estimate the healthcare costs of sarcopenia in United States and to examine effect that a reduced prevalence would have on expenditures. Design: Cross‐sectional surveys. Setting: Nationally representative surveys using data from U.S. Census, Third National Health Nutrition Examination Survey, Medical Care Utilization Expenditure Survey. Participants: Representative samples adults aged 60 older. Measurements: The were estimated based increasing physical disability risk older...

10.1111/j.1532-5415.2004.52014.x article EN Journal of the American Geriatrics Society 2003-12-24

The purpose of this study was to develop and cross-validate predictive equations for estimating skeletal muscle (SM) mass using bioelectrical impedance analysis (BIA). Whole body SM mass, determined by magnetic resonance imaging, compared with BIA measurements in a multiethnic sample 388 men women, aged 18–86 yr, at two different laboratories. Within each laboratory, predicting from were derived the data Caucasian subjects. These then applied subjects other laboratory method. Because...

10.1152/jappl.2000.89.2.465 article EN Journal of Applied Physiology 2000-08-01

The purpose of this study was to determine skeletal muscle cutpoints for identifying elevated physical disability risk in older adults. Subjects included 4,449 (> or = 60 years) participants from the Third National Health and Nutrition Examination Survey during 1988-1994. Physical assessed by questionnaire, bioimpedance used estimate muscle, which normalized height. Receiver operating characteristics were develop associated with a high likelihood disability. Odds compared subjects whose...

10.1093/aje/kwh058 article EN American Journal of Epidemiology 2004-02-06

<h3>Background</h3> No evidence supports the waist circumference (WC) cutoff points recommended by National Institutes of Health to identify subjects at increased health risk within various body mass index (BMI; calculated as weight in kilograms divided square height meters) categories. <h3>Objective</h3> To examine whether prevalence hypertension, type 2 diabetes mellitus, dyslipidemia, and metabolic syndrome is greater individuals with high compared normal WC values same BMI category....

10.1001/archinte.162.18.2074 article EN Archives of Internal Medicine 2002-10-14

Abstract Objective : To determine the association of sarcopenic obesity with onset Instrumental Activities Daily Living (IADL) disability in a cohort 451 elderly men and women followed for up to 8 years. Research Methods Procedures Sarcopenic was defined at study baseline as appendicular skeletal muscle mass divided by stature squared &lt;7.26 kg/m 2 5.45 percentage body fat greater than 60th percentile sample (28% 40% women). Incident loss two or more points from score on IADL. Subjects...

10.1038/oby.2004.250 article EN Obesity Research 2004-12-01

Objective. The prevalence of overweight and obesity in children is rising. Childhood associated with many negative social psychological ramifications such as peer aggression. However, the relationship between status different forms bullying behaviors remains unclear. purpose this article to examine these relationships. Methods. We examined associations (physical, verbal, relational, sexual harassment) a representative sample 5749 boys girls (11–16 years old). results were based on Canadian...

10.1542/peds.113.5.1187 article EN PEDIATRICS 2004-05-01

Abstract Objectives : To determine the effects of equivalent diet‐ or exercise‐induced weight loss and exercise without on subcutaneous fat, visceral insulin sensitivity in obese women. Research Methods Procedures Fifty‐four premenopausal women with abdominal obesity [waist circumference 110.1 ± 5.8 cm (mean SD)] (BMI 31.3 2.0 kg/m 2 ) were randomly assigned to one four groups: diet ( n = 15), 17), 12), a weight‐stable control group 10). All groups underwent 14‐week intervention. Results...

10.1038/oby.2004.95 article EN Obesity Research 2004-05-01

The purpose of this analytical review was to estimate the direct and indirect economic costs physical inactivity obesity in Canada 2001. relative risks diseases associated with were determined from a meta-analysis existing prospective studies applied health care these Canada. Estimates derived for both expenditures costs, which included value output lost because illness, injury-related work disability, or premature death. burden $5.3 billion ($1.6 $3.7 costs) while cost $4.3 $2.7 costs)....

10.1139/h04-008 article EN Canadian Journal of Applied Physiology 2004-02-01

The Canadian Society for Exercise Physiology assembled a Consensus Panel representing national organizations, content experts, methodologists, stakeholders, and end-users followed an established guideline development procedure to create the 24-Hour Movement Guidelines Adults aged 18–64 years 65 or older: An Integration of Physical Activity, Sedentary Behaviour, Sleep. These guidelines underscore importance movement behaviours across whole 24-h day. process strategy outlined in Appraisal...

10.1139/apnm-2020-0467 article EN cc-by Applied Physiology Nutrition and Metabolism 2020-10-01
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