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Kristin J. Heumann and Pamela D. Swan

Jumping rope (JR) is known to enhance Os Calcis Stiffness Index (OCSI) in postpubertal girls; however the effects in prepubescent girls are unknown.

Purpose:

Qualitative Ultrasound (QUS) indices were compared between competitive JRs (N = 19) and normally active (NA, N = 18) girls 9–12 years old.

Methods:

Heel QUS, height, weight, percent body fat (bioelectrical impedance), and Tanner Sex Stage (self-report) were measured.

Results:

JR were significantly younger and had less body fat than NA (p < .01). No other between group differences were found. OCSI was not different between groups even after correcting for fat mass (p > 0.3). Broadband attenuation (BUA) was correlated with Tanner stage (R > .40; p = .01).

Conclusion:

QUS of the heel bone is more related to pubertal status than to JR participation in young girls. Prepubertal girls who perform high intensity jumping have similar bone quality measures as normally active girls.

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* Krista Chandler * 4 2014 22 1 47 53 10.1123/wspaj.2014-0012 Qualitative Ultrasound Comparisons Between Pre-Pubertal Normally Active Girls versus Competitive Jump Rope Participants Kristin J. Heumann * Pamela D. Swan * 4 2014 22 1 54 58 10.1123/wspaj.2014-0002 Other Women in Sport and Physical

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Matt C. Crockett and Ted Butryn

, motivation, and discipline. For example, during a WOD to see how many jump rope repetitions we could accumulate within a certain timeframe, the class jumped in a large circle facing each other. From my vantage point I could watch anyone at anytime, and they could just as easily watch me. This collective