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Felipe García-Pinillos, Carlos Lago-Fuentes, Pedro A. Latorre-Román, Antonio Pantoja-Vallejo and Rodrigo Ramirez-Campillo

considerations. Jumping rope (JR) is a consecutive jump exercise with turning the rope, involving mainly foot muscles and joints, due to the quick rebounds. 11 Therefore, JR might be considered a type of PT for improving power and stiffness, some of the key factors for endurance running performance. 4

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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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Dana M. Lis and Keith Baar

containing equal parts of gelatin and HC. One hour later, the subjects were asked to jump rope to stimulate bone collagen synthesis, and after a further 4 hr, blood was drawn to determine the circulating levels of the N-terminal peptide of procollagen (PINP). PINP in the blood primarily represents bone

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David D. Anderson, Ben M. Hillberry, Dorothy Teegarden, William R. Proulx, Connie M. Weaver and Tomoaki Yoshikawa

Bone remodeling as a response to exercise in human subjects is described in the literature, although most studies treat exercise as a qualitative factor contributing to bone remodeling. Quantitative description requires assessment of the mechanical loads on the bones. This work describes a generalized lower extremity model that uses existing musculoskeletal modeling techniques to quantify mechanical variables in the femoral neck during exercise. An endurance exercise program consisting of walking, jogging jumping rope, and weight-training was analyzed. Peak femoral neck cortex stresses and strains were high during jogging and squatting, compared to walking, whereas jumping rope and other weight-training exercises produced peak stresses comparable to or lower than walking. Peak stress and strain rates were significantly higher for walking, jumping rope, and jogging than for weight-training. The model should prove useful for any study investigating a quantitative relationship between exercise and bone remodeling.

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

Background:

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

Methods:

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

Results:

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.

Conclusions:

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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Vinícius Y.B. Suetake, Emerson Franchini, Bruna T.C. Saraiva, Anne K.F. da Silva, Aline F.B. Bernardo, Rayane L. Gomes, Luiz Carlos M. Vanderlei and Diego G.D. Christofaro

a study with Japanese children of 6–11 years undergoing a physical exercise program that included activities such as aerobic dance, jumping rope, and jogging to music, also did not verify differences in the autonomic cardiac modulation of healthy children after the training program. One of the

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Sarah A. Amin, Paula J. Duquesnay, Catherine M. Wright, Kenneth Chui, Christina D. Economos and Jennifer M. Sacheck

,” and “3 sports.” Free play only consisted of unstructured activities including but not limited to playing on a playground, playing tag, jump rope, and skipping. Sports took precedence in the coding if listed with a free play activity. Therefore, if a child indicated a free play activity and one

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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