Kohei Kishimoto, Ryan P. Lynch, Jamie Reiger, Vanessa R. Yingling. (2012) Short-Term Jump Activity on Bone Metabolism in Female College-Aged Nonathletes. Journal of Sports Science and Medicine(11), 31 - 38.
Kohei Kishimoto, Ryan P. Lynch, Jamie Reiger, Vanessa R. Yingling. (2012) Short-Term Jump Activity on Bone Metabolism in Female College-Aged Nonathletes. Journal of Sports Science and Medicine(11), 31 - 38.
There have been few studies examining the short-term effect of high-impact activities on bone metabolism measured by bone serum marker concentrations. The purpose of this study was to examine the effect of short-term high-impact jump activity on bone turnover in female college-aged non-athletes. Twenty six healthy females were randomly assigned to a control or jump group. The subjects jumped 5 days per week for 2 weeks. The participants completed 10 jumps per session. A general health questionnaire and a bone-specific physical activity assessment instrument (BPAQ) were completed. BPAQ scores were calculated based on the past history of exercise. Blood draws were taken in both groups before and after the two-week experimental period. The vertical ground reaction force (VGRF) of all jumps and jump height were measured for each subject daily and the osteogenic index (OI) was measured. Concentrations of serum osteocalcin (OC), Bone Specific Alkaline Phosphatase (BAP), C-Terminal Telopeptides of Type I Collagen (CTX) and plasma Tartrate-Resistant Acid Phosphatase (TRAP5b) were assessed pre and post jump protocol to measure bone formation and resoprtion respectively. A significant interaction (time x group) was found in TRAP5b, and BAP values (p < 0.05). There was a significant decrease in CTX and BAP values in the jump group (p < 0.05) after the two week jump protocol. No significant interactions or changes were observed in OC values for either the jump or the control group. Two weeks of jump activity consisting of 10 jumps/day for 5 days/week with a weekly osteogenic index of 52.6 significantly decreased markers of bone resorption (TRAP5b and CTX) and bone formation (BAP) in young female non-athletes.
Key words:
Jump exercise, vertical ground reaction force, bone serum markers, randomized controlled study
Key
Points
Please provide 3-5 bullet points of the study.
Inductive qualitative methodologies can encourage the much-needed voice of female youth in sport and physical activity research.
Vignettes serve, not only as a method to illustrate data, but also as a medium to teach contextually relevant information to participants and sport science service providers.
The barriers and solutions to female youth engagement in physical activity are best understood through the perspectives of the intended participant.
Female youth can serve as central informants in the development and analysis of research projects relating to female youth physical activity.
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