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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.


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


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


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).


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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Feng-Tzu Chen, Su-Ru Chen, I-Hua Chu, Jen-Hao Liu and Yu-Kai Chang

, regardless of behavior and neuroelectric levels, were seen following multicomponent exercise interventions that involved complex neuromotor movements using a large variety of body parts (e.g., soccer, jumping rope; Chang, Tsai, Chen, & Hung, 2013 ). Beyond investigations of aerobic exercise in general, the

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Yong Gao, Haichun Sun, Jie Zhuang, Jian Zhang, Lynda Ransdell, Zheng Zhu and Siya Wang


This study determined the metabolic equivalents (METs) of several activities typically performed by Chinese youth.


Thirty youth (12 years) performed 7 activities that reflected their daily activities while Energy Expenditure (EE) was measured in a metabolic chamber.


METs were calculated as activity EE divided by participant’s measured resting metabolic rate. A MET value ranging from 0.8 to 1.2 was obtained for sleeping, watching TV, playing computer games, reading and doing homework. Performing radio gymnastics had a MET value of 2.9. Jumping rope at low effort required 3.1 METs. Except for watching TV, METs for other activities in this study were lower than Youth Compendium values.


The results provide empirical evidence for more accurately assessing EE of activities commonly performed by Chinese youth. This is the first study to determine METs for radio gymnastics and jump rope in Chinese youth.

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Jessica L. Chandler, Keith Brazendale, Clemens Drenowatz, Justin B. Moore, Xuemei Sui, Robert G. Weaver and Michael W. Beets

for girls than organized activity sessions, it seems to have a beneficial effect on the amount of time spent sedentary. More specifically, organized adult-led games tend to include inactive elements such as waiting in lines to take turns (eg, kickball, jump rope), elimination from the activity

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You Fu and Ryan D. Burns

time windows of unstructured active free play per week, supervised by their classroom teacher and a graduate assistant. During each free-play session, students were offered a number of physical activity choices, such as soccer, basketball, jump rope, bean bag, and tag games located on either a standard

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Sofiya Alhassan, Christine W. St. Laurent, Sarah Burkart, Cory J. Greever and Matthew N. Ahmadi

-related activities as part of an incentive challenge (eg, screen-free day or take a family walk). Preschoolers who completed at least half of the activities with their families received a PA incentive bag (ie, a bag with a kite, beach ball, and jump rope) at the end of the study. Assessment and Measures Outcome

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Anantha Narayanan, Farzanah Desai, Tom Stewart, Scott Duncan and Lisa Mackay

stairs, descending stairs, vacuum cleaning, ironing clothes, jumping rope, and lying (resting state) Controlled; 9 (1 female); Healthy population, age = 27.2 (3.3) y Colibri (Trivisio Prototyping, Trier, Germany) wireless inertial measurement units (IMUs); 3; 3-axis accelerometer, 100 Hz; Wrist, chest