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Gary J. Slater, Anthony J. Rice, David Jenkins, Jason Gulbin and Allan G. Hahn

To strengthen the depth of lightweight rowing talent, we sought to identify experienced heavyweight rowers who possessed physique traits that predisposed them to excellence as a lightweight. Identified athletes (n = 3) were monitored over 16 wk. Variables measured included performance, anthropometric indices, and selected biochemical and metabolic parameters. All athletes decreased their body mass (range 2.0 to 8.0 kg), with muscle mass accounting for a large proportion of this (31.7 to 84.6%). Two athletes were able to maintain their performance despite reductions in body mass. However, performance was compromised for the athlete who experienced the greatest weight loss. In summary, smaller heavyweight rowers can successfully make the transition into the lightweight category, being nationally competitive in their first season as a lightweight.

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Kayla M. Baker, Sean Healy, David J. Rice and Jeanette M. Garcia

Background: To examine the associations and differences between gender and weight classification for physical activity (PA) and individual, social, and parental factors. Methods: Data from wave 2 of the “Growing up in Ireland” national study were used, resulting in a sample of 7525 13-year-old adolescents. Information on factors affecting adolescents’ social, emotional, cognitive, and physical development was collected. Results: Overweight (OW) adolescents were more likely to exercise and restrict food for weight loss and less likely to perform moderate to vigorous PA than normal weight adolescents. Parent body mass index was associated with adolescent body mass index for OW and normal weight adolescents, with the strongest association seen with OW females. Parents of OW adolescents considered themselves to be more OW and less physically active than parents of normal weight adolescents. Furthermore, for all groups, a greater amount of moderate to vigorous PA was associated with less television viewing, greater PA of parents, and a greater number of friends. Conclusion: Parental health behaviors play a significant role in adolescents’ bodyweight, representing the necessity for more constructive health behaviors and PA among parents. Future interventions may be strengthened by focusing specifically on gender and body mass index, while taking into consideration the importance of parental behaviors on adolescents.

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Jeanette M. Garcia, Alen Agaronov, John R. Sirard, Diane Whaley, David J. Rice and Arthur Weltman

Background:

Sedentary behavior (SB) increases throughout adolescence, and is associated with adverse health outcomes.

Purpose:

Examine psychosocial and friend influences on SB and screen time in adolescents using a mixed-methods design.

Methods:

108 middle and high school students wore accelerometers to measure objective SB, completed screen time and psychosocial questionnaires, and nominated friends to complete activity questionnaires. Focus groups centered around influences on SB behavior. Regression analyses and NVivo software analyzed quantitative and qualitative data.

Results:

Screen time was associated with greater screen time enjoyment, lower self-efficacy, and friends’ screen time (r 2 = .21, P < .0001). Friends influenced whether adolescents engaged in screen time behaviors, with active friends encouraging less screen time.

Conclusion:

Active friends influenced adolescents to engage in less SB. Interventions should place an emphasis on encouraging less screen time, and providing opportunities for adolescents and their friends to engage in activities that promote physical activity rather than SB.