Kathleen F Janz
Biographic Data
| ID | 4283911 |
|---|---|
| NAME | Kathleen F Janz |
| GIVEN NAMES | Kathleen F |
| FAMILY NAME | Janz |
| SIGNATURE | JANZ K F |
| AFFILIATIONS | University of Iowa |
| ORCID | 0000-0002-2537-0601 |
| VERIFIED | Yes |
| TOTAL WORKS | 15 |
| TOTAL CITATIONS | 2 |
| AUTHOR COUNT | 15 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1993 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 1 |
High-Intensity Physical Activity During Late Adolescence Predicts Young Adult CT-Based Finite Element Bone Strength in Emerging Adulthood
Using a state-of-the-art CT/FEA method, this study suggests that high-intensity PA during late adolescence and emerging adulthood improves bone strength
Associations Between Youth Sport Participation and Bone, Muscle, and Fat in Adulthood
The objective of this study was to characterize bone, muscle, and fat measurements in early adulthood by youth sport participation. The study sample included 328 Iowa Bone Development Study participants (184 females). Organized sport participation was longitudinally assessed (14 times on average) using a physical activity questionnaire from age 6 to 17 years. At age 23 years, bone, lean mass (a proxy measure of muscle mass), and fat mass were ass…
Assessing Health Risk With Musculoskeletal Fitness Tests in Youth
The relationship between youth-fitness test items related to cardiorespiratory endurance and body composition and health outcomes is well established. Until recent years, the link between musculoskeletal fitness measures and health markers has been less conclusive. The information provided in this article offers evidence of the health links between youth musculoskeletal measures (specifically the grip test, the vertical jump, the long jump, and t…
Youth Sports Participation Is More Important among Females than Males for Predicting Physical Activity in Early Adulthood
A gender difference in youth sports and physical activity participation is well documented. However, research is limited to understand potential gender difference in the long-term effects of youth sports participation. The study aim was to compare the likelihood of meeting the aerobic Physical Activity Guidelines (PAG) in early adulthood by youth sports participation patterns among females and males. The study sample included 582 Iowa Bone Develo…
Physical Activity, All-Cause and Cardiovascular Mortality, and Cardiovascular Disease
International Comparison of the Levels and Potential Correlates of Objectively Measured Sedentary Time and Physical Activity among Three-to-Four-Year-Old Children
Physical activity (PA) patterns track from childhood through to adulthood. The study aimed to determine the levels and correlates of sedentary time (ST), total PA (TPA), and moderate-to-vigorous PA (MVPA) in preschool-aged children. We conducted cross-sectional analyses of 1052 children aged three-to-four-years-old from six studies included in the International Children's Accelerometry Database. Multilevel linear regression models adjusting for a…
Active Ottumwa
Background : Evidence-based interventions have been developed and tested to promote physical activity, but fewer studies have focused on identifying effective intervention strategies for mid-size rural communities, especially new immigrant destinations. We report here on the design and implementation of Active Ottumwa, a community-wide intervention using a lay health advisor approach to increase physical activity in a micropolitan new destination…
Calibration of the global physical activity questionnaire to Accelerometry measured physical activity and sedentary behavior
This research demonstrates the utility of calibrating self-report questionnaire data to objective measures to improve estimates of physical activity and sedentary behavior. It provides an understanding of the divide between objective and subjective measures, and provides a means to utilize the two methods as a unified measure
Association between maternal education and objectively measured physical activity and sedentary time in adolescents
BACKGROUND: Investigating socioeconomic variation in physical activity (PA) and sedentary time is important as it may represent a pathway by which socioeconomic position (SEP) leads to ill health. Findings on the association between children's SEP and objectively assessed PA and/or sedentary time are mixed, and few studies have included international samples. OBJECTIVE: Examine the associations between maternal education and adolescent's objectiv…
Objectively measured physical activity and sedentary time in youth
BACKGROUND: Physical activity and sedentary behaviour in youth have been reported to vary by sex, age, weight status and country. However, supporting data are often self-reported and/or do not encompass a wide range of ages or geographical locations. This study aimed to describe objectively-measured physical activity and sedentary time patterns in youth. METHODS: The International Children's Accelerometry Database (ICAD) consists of ActiGraph acc…
Opportunities for Public Health to Increase Physical Activity Among Youths
Despite the well-known benefits of youths engaging in 60 or more minutes of daily physical activity, physical inactivity remains a significant public health concern. The 2008 Physical Activity Guidelines for Americans (PAG) provides recommendations on the amount of physical activity needed for overall health; the PAG Midcourse Report (2013) describes effective strategies to help youths meet these recommendations. Public health professionals can b…
Calibration of Accelerometer Output for Children
Understanding the determinants of physical activity behavior in children and youths is essential to the design and implementation of intervention studies to increase physical activity. Objective methods to assess physical activity behavior using various types of motion detectors have been recommended as an alternative to self-report for this population because they are not subject to many of the sources of error associated with children's recall …
Growth, maturation, and physical activity, 2nd edition
Fat-free mass as a determinant of left ventricular mass in children
To assess the relationship of somatic growth to heart growth, associations were examined among body composition, blood pressure, androgens, sexual maturation, and left ventricular mass (LVM) during early puberty in 123 children, 7–12 years of age. All subjects underwent anthropometry, random-zero blood pressure measurements, hormone determination of androgens, physician's examination to determine sexual maturation, and echocardiographic examinati…
Criterion methods of body composition analysis for children and adolescents
The lack of chemical maturity, subsequent to normal growth and maturation, complicates the assessment of body composition in children. Even though known to overpredict percent body fat (%BF), the use of adult prediction equations is widespread in the pediatric literature. Many sex‐ and age‐specific modified equations have been proposed. This study reports a cross‐validation analysis of selected laboratory‐based criterion methods in an attempt to …
Association between maternal education and objectively measured physical activity and sedentary time in adolescents
BACKGROUND: Investigating socioeconomic variation in physical activity (PA) and sedentary time is important as it may represent a pathway by which socioeconomic position (SEP) leads to ill health. Findings on the association between children's SEP and objectively assessed PA and/or sedentary time are mixed, and few studies have included international samples. OBJECTIVE: Examine the associations between maternal education and adolescent's objectiv…
Criterion methods of body composition analysis for children and adolescents
The lack of chemical maturity, subsequent to normal growth and maturation, complicates the assessment of body composition in children. Even though known to overpredict percent body fat (%BF), the use of adult prediction equations is widespread in the pediatric literature. Many sex‐ and age‐specific modified equations have been proposed. This study reports a cross‐validation analysis of selected laboratory‐based criterion methods in an attempt to …
Fat-free mass as a determinant of left ventricular mass in children
To assess the relationship of somatic growth to heart growth, associations were examined among body composition, blood pressure, androgens, sexual maturation, and left ventricular mass (LVM) during early puberty in 123 children, 7–12 years of age. All subjects underwent anthropometry, random-zero blood pressure measurements, hormone determination of androgens, physician's examination to determine sexual maturation, and echocardiographic examinati…
Growth, maturation, and physical activity, 2nd edition
Calibration of Accelerometer Output for Children
Understanding the determinants of physical activity behavior in children and youths is essential to the design and implementation of intervention studies to increase physical activity. Objective methods to assess physical activity behavior using various types of motion detectors have been recommended as an alternative to self-report for this population because they are not subject to many of the sources of error associated with children's recall …
Objectively measured physical activity and sedentary time in youth
BACKGROUND: Physical activity and sedentary behaviour in youth have been reported to vary by sex, age, weight status and country. However, supporting data are often self-reported and/or do not encompass a wide range of ages or geographical locations. This study aimed to describe objectively-measured physical activity and sedentary time patterns in youth. METHODS: The International Children's Accelerometry Database (ICAD) consists of ActiGraph acc…
Opportunities for Public Health to Increase Physical Activity Among Youths
Despite the well-known benefits of youths engaging in 60 or more minutes of daily physical activity, physical inactivity remains a significant public health concern. The 2008 Physical Activity Guidelines for Americans (PAG) provides recommendations on the amount of physical activity needed for overall health; the PAG Midcourse Report (2013) describes effective strategies to help youths meet these recommendations. Public health professionals can b…
Association between maternal education and objectively measured physical activity and sedentary time in adolescents
BACKGROUND: Investigating socioeconomic variation in physical activity (PA) and sedentary time is important as it may represent a pathway by which socioeconomic position (SEP) leads to ill health. Findings on the association between children's SEP and objectively assessed PA and/or sedentary time are mixed, and few studies have included international samples. OBJECTIVE: Examine the associations between maternal education and adolescent's objectiv…
Active Ottumwa
Background : Evidence-based interventions have been developed and tested to promote physical activity, but fewer studies have focused on identifying effective intervention strategies for mid-size rural communities, especially new immigrant destinations. We report here on the design and implementation of Active Ottumwa, a community-wide intervention using a lay health advisor approach to increase physical activity in a micropolitan new destination…
Calibration of the global physical activity questionnaire to Accelerometry measured physical activity and sedentary behavior
This research demonstrates the utility of calibrating self-report questionnaire data to objective measures to improve estimates of physical activity and sedentary behavior. It provides an understanding of the divide between objective and subjective measures, and provides a means to utilize the two methods as a unified measure
Physical Activity, All-Cause and Cardiovascular Mortality, and Cardiovascular Disease
International Comparison of the Levels and Potential Correlates of Objectively Measured Sedentary Time and Physical Activity among Three-to-Four-Year-Old Children
Physical activity (PA) patterns track from childhood through to adulthood. The study aimed to determine the levels and correlates of sedentary time (ST), total PA (TPA), and moderate-to-vigorous PA (MVPA) in preschool-aged children. We conducted cross-sectional analyses of 1052 children aged three-to-four-years-old from six studies included in the International Children's Accelerometry Database. Multilevel linear regression models adjusting for a…
Youth Sports Participation Is More Important among Females than Males for Predicting Physical Activity in Early Adulthood
A gender difference in youth sports and physical activity participation is well documented. However, research is limited to understand potential gender difference in the long-term effects of youth sports participation. The study aim was to compare the likelihood of meeting the aerobic Physical Activity Guidelines (PAG) in early adulthood by youth sports participation patterns among females and males. The study sample included 582 Iowa Bone Develo…
Assessing Health Risk With Musculoskeletal Fitness Tests in Youth
The relationship between youth-fitness test items related to cardiorespiratory endurance and body composition and health outcomes is well established. Until recent years, the link between musculoskeletal fitness measures and health markers has been less conclusive. The information provided in this article offers evidence of the health links between youth musculoskeletal measures (specifically the grip test, the vertical jump, the long jump, and t…
High-Intensity Physical Activity During Late Adolescence Predicts Young Adult CT-Based Finite Element Bone Strength in Emerging Adulthood
Using a state-of-the-art CT/FEA method, this study suggests that high-intensity PA during late adolescence and emerging adulthood improves bone strength
Associations Between Youth Sport Participation and Bone, Muscle, and Fat in Adulthood
The objective of this study was to characterize bone, muscle, and fat measurements in early adulthood by youth sport participation. The study sample included 328 Iowa Bone Development Study participants (184 females). Organized sport participation was longitudinally assessed (14 times on average) using a physical activity questionnaire from age 6 to 17 years. At age 23 years, bone, lean mass (a proxy measure of muscle mass), and fat mass were ass…
Medicine (13 works) · Obesity, Physical Activity, Diet (8 works) · Physical Activity and Health (8 works) · Physical activity (7 works) · Physical therapy (7 works) · Psychology (7 works) · Gerontology (6 works) · Body Composition Measurement Techniques (5 works) · Children's Physical and Motor Development (5 works) · Computer Science (4 works)