Current Search: puberty (x)
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Title
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THE DIFFERENCE IN VENTILATORY THRESHOLD AMONG ADOLESCENT MALES BASED ON MATURITY STATUS.
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Creator
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Loney, Dyane, Stout, Jeffery R., University of Central Florida
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Abstract / Description
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Previous research has shown an inverse relationship between age and the relative intensity at which ventilatory threshold (VT) occurs in adolescent boys. However, no study has examined the effect of maturity status on VT in the differences in boys from the onset of puberty, adolescents. The purpose of this study was to compare VT among adolescent boys of different maturational groups. Methods: For this study, moderately active adolescent male participants (14 � 3 y) completed this study....
Show morePrevious research has shown an inverse relationship between age and the relative intensity at which ventilatory threshold (VT) occurs in adolescent boys. However, no study has examined the effect of maturity status on VT in the differences in boys from the onset of puberty, adolescents. The purpose of this study was to compare VT among adolescent boys of different maturational groups. Methods: For this study, moderately active adolescent male participants (14 � 3 y) completed this study. Maturational status of the participants was determined via years from peak height velocity (PHV), which is an estimation of somatic maturity status derived from age, standing height, seated height, body mass, and leg length. Participants were categorized into PRE- (lesser than 1 year till PHV), PERI- (within 1 year of PHV), and POST-PHV (greater than 1 year past PHV). All participants completed a ramp graded exercise test on a cycle ergometer. During the test, participants were given a three-minute warm-up with no resistance before starting at a workload of 30 watts which increased at a rate of 1 watt every 3 seconds until volitional fatigue. Throughout the test, oxygen consumption (VO2) and ventilation were measured. VT was determined, as a percentage of VO2max, from the ventilation versus VO2 graph using the maximal deviation method. Differences in VT between maturational groups were examined using one-way ANOVA. Results: A significant (F=5.36; p=0.014) difference in VT among maturational groups was found (Appendix A, Figure 2). Post hoc analysis revealed that PRE (p=0.029) and PERI (p=0.009) had VT occur at a significantly greater relative percentage of VO2max than POST. However, no significant (p=0.970) differences were found between PRE and PERI (Appendix A, Figure 3). Conclusion: Adolescent males in PRE and PERI demonstrated higher VT as a percentage of their VO2max compared to POST. This finding suggests the differences in the delayed switch from aerobic to anaerobic metabolism during incremental exercise in adolescent boys who are PRE and PERI.
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Date Issued
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2016
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Identifier
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CFH2000145, ucf:45945
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFH2000145
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Title
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WHAT IS THE IMPORTANCE OF AGE AT MENARCHE ON ADULT HEIGHT RELATIVE TO OTHER KNOWN FACTORS?.
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Creator
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Kacerosky, Pamela, McIntyre, Matthew, University of Central Florida
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Abstract / Description
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Objectives: To analyze the association between age at menarche, as a measure of sexual maturation, and adult height from ten published studies. Methods: Compared published measurements of age at menarche, adult height, and within-sample relationships observed in ten studies, for women from several societies and socioeconomic backgrounds, living in the 20th century, Results: In these studies, early maturers were taller during pre-puberty, but had shorter adult height then later maturers. Late...
Show moreObjectives: To analyze the association between age at menarche, as a measure of sexual maturation, and adult height from ten published studies. Methods: Compared published measurements of age at menarche, adult height, and within-sample relationships observed in ten studies, for women from several societies and socioeconomic backgrounds, living in the 20th century, Results: In these studies, early maturers were taller during pre-puberty, but had shorter adult height then later maturers. Late maturers experience a longer period of pre-pubertal growth and a delayed age of peak height velocity, leading to an extended overall time of growth, until adult stature was obtained. Conclusions: Improved living conditions and energy balance increase childhood growth rate, and are associated with an earlier puberty, and shorter duration of growth. In developed countries duration of growth may play an increasingly important role in adult stature.
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Date Issued
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2011
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Identifier
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CFH0004090, ucf:44803
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFH0004090