Kathleen Janz

You are here

Kathy Janz
Health Promotion
Physical Activity and Health Outcomes
End Degree:
Ed.D., Community Health & Exercise Physiology
E130 FH
Email: Laboratory:
Physical Activity and Health Outcomes Laboratory
Lab Website:

Courses Taught

  • Contemporary Issues in Health Promotion
  • Epidemiology of Physical Activity
  • Exercise Testing and Prescription
  • Health Promotion Research and Program Models
  • Health Promotion Theory and Practice
  • Methods: Health Education for Elementary Teachers
  • Physical Activity through the Lifespan
  • Women's Health Symposium

Research Interests

  • Physical activity and physical fitness as determinants of health outcomes
  • Electronic monitoring of physical activity
  • Longitudinal tracking of physical activity

Awards, Honors, Prestigious Appointments

Appointed, Physical Activity in Adolescence and Emerging Adulthood Writing Committee. Lancet Physical Activity Series 3. Systematically review evidence and publish new studies, as needed, to establish the associations of physical activity with health behaviors and healthy outcomes during emerging adulthood.  2018-present.

Invited Featured Speaker, Physical Activity Pattern Development from Infancy Through Adolescence. Modeling the Activity of Children and Youth Meeting. National Cancer Institute, NIH, Aug 30-31, 2018.

Appointed, Evidence-based Consensus Recommendations on Youth Collision and Contact Sport Writing Committee. Four Corners Consortium and American College of Sports Medicine, 2018-present.

Noll Distinguished Lecturer, Delivering Physical Activity in School Settings to Optimize Bone Health. Seminar, Department of Kinesiology and Physiology, Pennsylvania State University, Nov 2, 2017.

Appointed, Bone Health Across the LIfespan Scientific Writing Committee. National Osteoporosis Foundation and American College of Sports Medicine, 2018 to present.  Charged with the development and dissemination of new information related to dietary interventions and exercises that promote bone health and protect against fractures.

Distinguished Lecturer, Promoting Musculoskeletal Health in Youth, Department of Human Kinetics, University of Lisbon, Lisbon, Portugal, June 10, 2017.

Appointed, FitnessGram Scientific Advisory Board, The Cooper Institute. Guidance on structure and direction of the U.S. national youth assessment program (Presidential Youth Fitness Program).  Provide technical content expertise in muscle- and bone-strengthening physical activity and physical fitness. 2017-2019.

Appointed, 2018 Physical Activity Guidelines Advisory Committee. One of 17 nationally recognized experts in physical activity and health. U.S. Department of Health and Human Services, 2016-2018.

Appointed, Presidents’ Commission American Kinesiology Association and National Kinesiology Academy. One of eight senior academics charged with creating best practices for the study of kinesiology within U.S. universities and colleges. 2016-2017.

Elected, Executive Committee, National Academy of Kinesiology, 2016-2018.

Outstanding Outreach and Public Engagement Award. College of Liberal Arts and Sciences, University of Iowa, 2015-2016.

Invited Featured Speaker.  Effects of Physical Activity on Bone Development. The National Institutes of Health, Institute of Child Health and Human Development Special Meeting on Determinants of Peak Bone Mass, Bethesda, MD, November 17, 2015.

Invited Keynote Speaker.  Critical Measurement and Evaluation Issues in Physical Activity and Bone Health of Youth. 27th International Sport Science Congress, Korean Alliance for Health Physical Education, Recreation and Dance, Gwangju, Korea, July 13, 2015.

Invited Featured Speaker.  Physical Activity and Obesity in Youth:  Longitudinal Evidence.  Physical Activity and Primary Prevention of Obesity in Youth. The National Academies, Institute of Medicine, Washington DC, April 14, 2015.

Invited Keynote Speaker.  Physical Activity, Sedentary Time and Health in Young People – What Have We Learned from Longitudinal Research?  8th European Youth Heart Study Symposium, Oslo, Norway, March 11, 2015.

Invited Keynote speaker.  Building Better Bones. Biennial Conference North American Society Pediatric Exercise Medicine, Minneapolis, MN, August 20, 2014.

Distinguished Lecturer, Stronger, Better, Healthier. University of Mississippi, 2014 Kevser Ermin Memorial Lecture, April 2, 2014.

National Academy of Kinesiology, elected 2011.  Honorary society established in 1904 to “recognize exemplary, scholarly, and professional productivity in the areas of human movement and physical activity.”  Total number of active fellows is limited to 165 scholars, 2011 – present.

Distinguished Lecturer, Strong Kids Stay Healthy. Illinois State University, 2012 Esther Larsen McGinnis Scholar Lecture, Oct 25, 2012. 

American College of Sports Medicine - Fellowship, 1998 - present.

American Heart Association - Fellowship in the Council on Epidemiology and Prevention,
1997 - 2005.

American Heart Association – Finalist Jeremiah Stamler Research Award for New Investigators, 1993.

Recent Research & Scholarship (from 130 peer-reviewed papers)

Peer-Reviewed Publications: Journal Articles
* Denotes my role as senior researcher with study originating from my lab.

Baquero , Kava CM, Ashida S, Daniel-Ullo J, Laroche HH, Haines H, Bucklie R, Maldonado A, Garcia MC, Berto S, Sewell D, Novak N, Janz KF, Gates C, Parker EA.   Active Ottumwa: adapting evidence-based recommendations to promote physical activity in a micropolitan new destination community. International Journal of Environmental Research and Public Health, 2018, in press.

Zymbal V, Baptista F, Letuchy EM, Janz KF*, Levy SM. Mediating effect of muscle on the relationship of physical activity and bone. Med Sci Sports Exerc. 2018 Aug 28. doi: 10.1249/MSS.0000000000001759. [Epub ahead of print].

Levy SM, Eichenberger-Gilmore JM, Warren JJ, Kavand G, Letuchy E, Broffitt B, Marshall TA, Burns TL, Janz KF, Pauley C, Torner JC, Phipps K. Associations of fluoride intake with children's cortical bone mineral and strength measures at age 11. J Public Health Dent. 2018 Aug 29. doi: 10.1111/jphd.12286. [Epub ahead of print].

Oweis RR, Levy SM, Eichenberger-Gilmore JM, Warren JJ, Burns TL, Janz KF, Torner JC, Saha PK, Letuchy E. Fluoride intake and cortical and trabecular bone characteristics in adolescents at age 17: A prospective cohort study.  Community Dent Oral Epidemiol. 2018 Jul 1. doi: 10.1111/cdoe.12373. [Epub ahead of print].

Tarp J, Child A, White T, Westgate K, Bugge A, Grøntved A, Wedderkopp N, Andersen LB, Cardon G, Davey R, Janz KF, Kriemler S, Northstone K, Page AS, Puder JJ, Reilly JJ, Sardinha LB, van Sluijs EMF, Ekelund U, Wijndaele K, Brage S; International Children’s Accelerometry Database (ICAD) Collaborators. Physical activity intensity, bout-duration, and cardiometabolic risk markers in children and adolescents. Int J Obes (Lond). 2018 Jul 13. doi: 10.1038/s41366-018-0152-8. [Epub ahead of print].

 Hansen BH, Anderssen SA, Andersen LB, Hildebrand M, Kolle E, Steene-Johannessen J, Kriemler S, Page AS, Puder JJ, Reilly JJ, Sardinha LB, van Sluijs EMF, Wedderkopp N, Ekelund U; International Children’s Accelerometry Database (ICAD) Collaborators. Cross-sectional associations of reallocating time between sedentary and active behaviours on cardiometabolic risk factors in young people: International Children's Accelerometry Database (ICAD) Analysis. Sports Med. 2018 Apr doi: 10.1007/s40279-018-0909-1. [Epub ahead of print].

Janz KF, Baptista F. Bone Strength and Exercise During Youth-The Year That Was 201 Pediatr Exerc Sci. 2018 Feb 1;30(1):28-31. doi: 10.1123/pes.2017-0295. Epub 2018 Feb 19.

Saint-Maurice PF, Laurson K, Welk GJ, Eisenmann J, Gracia-Marco L, Artero EG, Ortega F, Ruiz JR, Moreno LA, Vicente-Rodriguez G, Janz KF*. Grip strength cutpoints for youth based on a clinically relevant bone health outcome. Arch Osteoporos. 2018 Aug 27;13(1):92. doi: 10.1007/s11657-018-0502-0.

Metcalf KM, Baquero BI, Coronado Garcia ML, Francis SL, Janz KF, Laroche HH, Sewell DK. Calibration of the global physical activity questionnaire to accelerometry measured physical activity and sedentary behavior. BMC Public Health, 2018, 18(1), 412-421.

Jerome M, Janz KF, Baquero B, Carr, LJ. Introducing sit-stand desks increases classroom standing time among college students. Preventive Medicine Reports, 2017 Nov 9;8:232-237. doi: 1016/j.pmedr.2017.10.019. eCollection.

Janz KF, Boros P, Letuchy EM, Kwon S, Burns TL, Levy SM. Physical Activity, Not Sedentary Time, Predicts Dual-Energy X-ray Absorptiometry-measured Adiposity Age 5 to 19 Years. Med Sci Sports Exerc, 2017 Oct;49(10):2071-2077.

Atkin AJ, Biddle SJH, Broyles ST, Chinapaw M, Ekelund U, Esliger DW, Hansen BH, Kriemler S, Puder JJ, Sherar LB, van Sluijs EMF; International Children’s Accelerometry Database (ICAD) Collaborators. Harmonising data on the correlates of physical activity and sedentary behaviour in young people: Methods and lessons learnt from the international Children's Accelerometry database (ICAD). Int J Behav Nutr Phys Act, 2017 Dec 20;14(1):174.

Glass N, Torner JC, Burns TL, Letuchy, E, Janz KF, Eichenberger-Gilmore, Levy SM. Does visceral or subcutaneous fat influence peripheral cortical bone strength during adolescence? A longitudinal study. Journal of Bone Mineral Research, 2017 Oct 30. doi: 10.1002/jbmr.3325.

Calarge C, Mills J, Janz KF, Burns TL, Schlechte J, Coryell W,  Zemel B. The effect of depression, generalized anxiety, and selective serotonin reuptake inhibitors on change in bone metabolism in adolescents and emerging adults.  Journal of Bone Mineral Research, 2017 Dec;32(12):2367-2374. doi: 10.1002/jbmr.3238

Aitaoto N, Campo SL, Snetselaar LG, Janz KF, Parker E, Belyeu-Camacho T, Jimenez RP. Factors Inhibiting Physical Activity as Treatment for Diabetic Chuukese in Chuuk and Hawai'i. Hawaii J Med Public Health, 2017 Sep;76(9):247-252.

Corbin C, Janz KF, Baptista F. Good health: The power of power. J Physical Education, Recreation, and Dance, 2017 88, 28-35.

Calarge C, Mills J, Janz KF, Coryell W, Burns TL, Zemel T. Body composition in adolescents during treatment with selective serotonin reuptake inhibitors.  Pediatrics, 2017 Jul;140(1). pii: e20163943. doi: 10.1542/peds.2016-3943.

Zhang J, Campo S, Yang J, Eckler P, Snetselaar L, Janz KF, Leary E. What motivates young adults to talk about physical activity on social network sites? Journal of Medical Internet Research, 2017 Jun 22;19(6):e226. doi: 10.2196/jmir.7017.

Harrison F, Goodman A, van Sluijs EMF, Andersen LB, Cardon G, Davey R, Janz KF, Kriemler S, Molloy L, Page AS, Pate R, Puder JJ, Sardinha LB, Timperio A, Wedderkopp N, Jones AP; on behalf the ICAD collaborators. Weather and children's physical activity; how and why do relationships vary between countries? Int J Behav Nutr Phys Act, 2017 May 30;14(1):74. doi: 10.1186/s12966-017-0526-7.PMID 28558747.

Janz KF.  Bone strength. Pediatric Exercise Science, 2017, 29:23-25.

Singh B, Vo H, Francis SL, Janz KF, Yack JH. Changes in Gait over a 30-min Walking Session in Obese Females. Med Sci Sports Exerc, 2017. 49(3):555-562.

Kwon S, Janz, KF*, Letuchy E, Burns TL, Levy SM. Association between body mass index percentile trajectories in infancy and adiposity in childhood and early adulthood. Obesity, 2017 Jan;25(1):166-171. doi: 10.1002/oby.21673.

Francis SL, Janz KF*.  Progress and challenges in objectively measuring bone-strengthening physical activity. International Journal of Applied Sports Sciences, 2016 28:59-67.

Zymbal V, Janz KF, Baptista F. Sexual dimorphism in bone-muscle relationship in young adults. J Sports Sci, 2016 Dec 27:1-6. doi: 10.1080/02640414.2016.1273535. [Epub ahead of print]

Singh B, Negatu MG, Francis SL, Janz KF, Yack HJ. Do fitness and fatigue affect gait biomechanics in overweight and obese children? Gait Posture, 2016 Oct;50:190-195. doi: 10.1016/j.gaitpost.2016.09.006. Epub 2016 Sep 8.

Corder K, Sharp SJ, Atkin AJ, Andersen LB, Cardon G, Page A, Davey R, Grøntved A, Hallal PC, Janz KF, Kordas K, Kriemler S, Puder JJ, Sardinha LB, Ekelund U, van Sluijs EM; International Children's Accelerometry Database (ICAD) Collaborators. Age-related patterns of vigorous-intensity physical activity in youth: The International Children's Accelerometry Database. Prev Med Rep, 2016 May 16;4:17-22. doi: 10.1016/j.pmedr.2016.05.006. eCollection 2016 Dec.

Baptista F, Mil-Homens P, Carita A, Janz KF, Sardinha L. Peak vertical jump power as a marker of bone health in children.  International Journal of Sports Medicine, 2016 Jul;37(8):653-8. doi: 10.1055/s-0042-105290. Epub 2016 May 13.

Kwon S, Janz, KF*, Letuchy E, Burns TL, Levy SM, Parental characteristic patterns associated with maintaining healthy physical activity behavior during childhood and adolescence. International Journal of Behavioral Nutrition and Physical Activity, 2016 13:58 DOI: 10.1186/s12966-016-0383-9.

Glass N, Torner JC, Burns TL, Letuchy, E, Janz KF, Eichenberger-Gilmore, Levy SM. The relationship between greater pre-pubertal adiposity, subsequent age of maturation and bone strength during adolescence.  Journal of Bone Mineral Research, 2016 Jul;31(7):1455-65. doi: 10.1002/jbmr.2809.

Sherar LB, Griffin TP, Ekelund U, Cooper AR, Esliger DW, van Sluijs EMF, Andersen, LB, Cardon G, Davey R, Froberg K, Hallal PC, Janz KF, Kordas K, Kriemler S, Pate RR, Puder JJ, Sardinha LB, Timperio AF, Page AS. Association between maternal education and objectively measured physical activity and sedentary time in adolescents. Journal of Epidemiology & Community Health, 2016 Jan 22. pii: jech-2015-205763. doi: 10.1136/jech-2015-205763. [Epub ahead of print].

Weaver CM, Gordon CM, Janz KF, Kalwarf HJ, Lappe JM, Lewis R, OKarma M, Wallace TC, Zemel BS.  Peak bone mass development and lifestyle factors: A systematic review and implementation recommendations.  Osteoporosis International, 2016 Feb 8. [Epub ahead of print].

Recent Peer-Reviewed Publications: Chapters, Reviews, Government Publications (from 14 publications)

The 2018 Physical Activity Guidelines Advisory Committee Scientific Report, Washington, DC:  U.S. Department of Health and Human Services, 2018. One of 17 committee members/writers. https://health.gov/paguidelines/second-edition/report.aspx

Janz KF & Boros P. The most important activity behavior to combat childhood obesity? ACSM Sports Medicine Bulletin. 2017. Retrieved from http://www.multibriefs.com/briefs/acsm/active120517.htm 

Zymbal V, Baptista F, Fernandes P, Janz KF. Book Chapter. Determining Skeletal Geometry. In: Biomarkers in Disease: Methods, Discoveries and Applications, edited VR Preedy, Springer: New York, 2017.

Weaver CM, Gordon CM, Janz KF, Kalkwarf HJ, Lappe JM, Lewis R, O’Karma M, Wallace TC, Zemel BS. Book Chapter. Lifestyle Factors That Affect Peak Bone Mass Accrual.  In: Nutritional Influences on Bone Health, edited by CM Weaver, RM Daly, and HA Bischoff-Ferrari, Springer: New York, 2016.

Janz KF, Letuchy EM, Francis SL, Metcalf KM, Burns TL, Levy SM. Objectively measured physical activity predicts hip and spine bone mineral content in children and adolescents ages 5 – 15 years: Iowa bone development study. In J.H. Tobias (Ed.), Mechanical Loading and Bone (pp. 19-25). Lausanne: Frontiers Media, 2016.

Janz KF & Francis SL. It’s a power thing: Muscle function, muscle size and bone strength. ACSM Sports Medicine Bulletin. 2015. Retrieved from http://www.multibriefs.com/briefs/acsm/active111015.htm 

Institute of Medicine. Physical Activity: Moving Toward Obesity Solutions, Workshop Summary. Washington DC: National Academies Press, Chapter Presenter, 2015.

Current Funding External

Investigator, Family Obesity Intervention: Motivational Interviewing and Community Support.  Agency: NIH – NHLBI: Community-Level Health Promotion R01 HL11988.  University of Iowa, Department of Internal Medicine, Helena Laroche, Principal Investigator. $3,477,564 total.  Community intervention to reduce obesity in low-income families.  My role is to direct baseline, mid, and follow-up measures of physical activity and train health coaches. Janz:  5% effort (0.6 person months) and 25% research graduate assistant support.  2014-2019.

Investigator, University of Iowa Prevention Research Center for Rural Health.  Agency: Centers for Disease Control and Prevention 1 U48 DP001902-01.  University of Iowa, Department of Community and Behavioral Health, Edith Parker, Principal Investigator, $4,476,831 total. My role is to assess baseline and post intervention physical activity.  Janz:  5% effort (0.6 person months) and 25% research graduate assistant support.  2014-2019.

Investigator, Fluoride, Dietary, and Other Factors Related to Young Adult Bone Measures and Dental Caries, R56 DE012101.  Renamed and renumbered from: Fluoride and Other Factors in Childhood Bone Development Renewal. Agency: NIH - National Institute of Dental and Craniofacial Research.  Original grant was funded under R01 DE12101-R (3 cycles 1998 to 2002, 2003 to 2008, no cost extension 2009, 2010 to 2014). University of Iowa, Department of Preventive and Community Dentistry, Steven Levy, Principal Investigator.  $482,164 annually. Janz:  15% effort (1.8 person months) and 50% research graduate assistant support and undergraduate RA support.  2015-2018. No Cost Extension.  Renewed Application in Review. 2018. 

Formal Consulting

Consultant Physical Activity Assessment, Camp DASH, Purdue University, NHLBI 1U01HL117835, Connie Weaver, Principal Investigator. 2017-2018.

Scientific Advisory Committee Member and Consultant Bone Measurement, Ohio Musculoskeletal & Neurological Institute (OMNI), Ohio University, Brian Clark, Director. 2016-2018.

Scientific Advisory Committee Member and Consultant Physical Activity Assessment, Pelvic Floor Disorders Network, University of Utah, PO1, Ingrid Nygaard, Principal Investigator. 2013-2018.