Children’s metabolic expenditure during object projection skill performance: New insight for activity intensity relativity |
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| Authors: | Ryan S Sacko Danielle Nesbitt Kerry McIver Ali Brian Farid Bardid David F Stodden |
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| Institution: | 1. Department of Health and Human Performance, The Citadel, Charleston, SC, USA;2. Department of Physical Education, University of South Carolina, Columbia, SC, USA;3. Department of Exercise Science, University of South Carolina, Columbia, SC, USA;4. School of Education, University of Strathclyde, Glasgow, UK;5. Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium |
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| Abstract: | Objective: To examine children’s energy expenditure (EE) during object projection skill performance at three intensity intervals. Methods: Children’s (42, Mage = 8.1) average metabolic equivalents of task (METs) were calculated using a COSMED K4b2 while they repeatedly performed blocks of kicking, throwing (overhand), and striking (two-handed) during 6, 12, and 30-s interval conditions. A repeated-measures analysis of covariance examined differences in METs while controlling for skill level. Results: Data indicated a main effect for interval condition (df = 2, 123, F = 94.36, p <.001, η2 = .605). Post hoc t-tests demonstrated decreasing performance interval times yielded progressively higher METs (p <.001) across the three conditions (30s = 4.5±0.8 METs, 12s = 6.3±1.3, 6s = 8.3±1.6). There also was a main effect for sex (df = 1,120, F = 52.28, p <.001 η2 = .305). Boys demonstrated higher METs at each performance interval (p <.001). Conclusion: Skill practice with a maximum of one trial every 30s resulted in the equivalent of at least moderate physical activity (>4.0 METs) and intervals of 6s demonstrated vigorous physical activity (>7.0 METs). Practicing/performing object projection skills, even at intervals that allow for adequate instruction and feedback (i.e., 1 trial/30s), promotes MVPA in children. |
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| Keywords: | Metabolism motor skills physical education physical activity pediatrics |
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