Medicine and Health Sciences Commons^™

Loading Rate In Self-Initiated Vertical Jump Landings: Developmental And Gender Comparisons, Pamela Russell, Erik Swartz, Ron Croce, Laura Decoster

Pamela J. Russell

The study compared gender and developmental differences in vertical loading rate upon a two-footed landing from a self-initiated VJ. Fifty-seven subjects grouped by age (pre-pubescent (8-11 yrs); post-pubescent (19-29 yrs)) and gender consented to participate. Subjects jumped for a ball set at 50% of their maximum VJ height, and landed on two feet, facing forward, with only their dominant foot on the force plate. Motion analysis (3-D) and ground reaction force (GRF) data were collected. Statistical analyses indicated significant developmental differences in vertical loading rate normalized to kinetic energy, but no gender differences. Children may have higher loading rates because …

Predictors Of Adolescent Male Body Image Dissatisfaction: Implications For Negative Health Practices And Consequences For School Health From A Regionally Representative Sample, James Leone, Joyce Fetro, Mark Kittleson, Kathleen Welshimer, Julie Partridge, Stacia Robertson

Mark J Kittleson

BACKGROUND: Adolescent males are more likely to sustain intentional and unintentional injuries, be involved in a physical confrontation, and be successful in suicide attempts. Body image dissatisfaction (BID) has been linked as a possible contributing factor to these negative health behaviors and risks; however, research is limited with males. The interaction of intrapersonal, interpersonal, and social variables in a holistic model has yet to be explored for males. Variables precipitating adolescent males to develop an unhealthy body image and act on negative health behaviors, such as body image drug use, were the impetus for this study. METHODS: A randomized cross-sectional …

Men Are More Likely Than Women To Slow In The Marathon, Robert O. Deaner, Rickey E. Carter, Michael J. Joyner, Sandra K. Hunter

Exercise Science Faculty Research and Publications

Studies on nonelite distance runners suggest that men are more likely than women to slow their pace in a marathon.

Purpose: This study determined the reliability of the sex difference in pacing across many marathons and after adjusting women's performances by 12% to address men's greater maximal oxygen uptake and also incorporating information on racing experience.

Methods: Data were acquired from 14 US marathons in 2011 and encompassed 91,929 performances. For 2929 runners, we obtained experience data from a race-aggregating Web site. We operationalized pace maintenance as the percentage change in pace observed in the second half of the marathon …