Modeling the dose-response rate/associations between VO2max and self-reported physical activity (PAQ) in children

Alan Nevill, Michael Duncan, Gavin Sandercock

Research output: Contribution to journalArticle

Abstract

Background: This study sought to explore the dose-response rate/association between VO2max and self-reported physical activity (using PAQ), and to assess whether this association varies by sex, age and weight status. Methods: VO2max was assessed using the 20-metre shuttle-run test. Physical Activity (PA) was assessed using the Physical Activity Questionnaire for Adolescents (aged >11 years, PAQ-A) or for Children (aged <11 years, PAQ-C). The associations between VO2max and PAQ were analyzed using ANCOVA adopting PAQ and PAQ2 as covariates, but allowing the intercepts and slope parameters of PAQ and PAQ2 to vary with the categorical variables sex, age group and weight status. Results: ANCOVA identified a curvilinear association between VO2max and PAQ, with positive linear PAQ terms that varied for both sex and weight status but with a negative PAQ2 term -0.39 (95%CI -0.57 to -0.21) that was common for all age, sex and weight status groups. These curvilinear (inverted U) associations suggests that the benefits of increasing PA (same dose) on VO2max is greater when children report low levels of PA compared to children who report higher levels of PA. These dose-response rates were also steeper for boys, and steeper in lean compared with overweight/obese children. Conclusions: Health practitioners should be aware that encouraging greater PA (same dose) in inactive and underweight children will result in greater gains in VO2max (response) compared with their active and overweight/obese counterparts.
LanguageEnglish
Pages(In-press)
JournalJournal of Sport and Health Science
Volume(In-press)
Publication statusAccepted/In press - 9 Mar 2019

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Exercise
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Keywords

  • Aerobic fitness
  • ANCOVA
  • curvilinear association
  • slope parameters
  • weight status
  • age
  • sex

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Modeling the dose-response rate/associations between VO2max and self-reported physical activity (PAQ) in children. / Nevill, Alan; Duncan, Michael; Sandercock, Gavin.

In: Journal of Sport and Health Science, Vol. (In-press), 09.03.2019, p. (In-press).

Research output: Contribution to journalArticle

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abstract = "Background: This study sought to explore the dose-response rate/association between VO2max and self-reported physical activity (using PAQ), and to assess whether this association varies by sex, age and weight status. Methods: VO2max was assessed using the 20-metre shuttle-run test. Physical Activity (PA) was assessed using the Physical Activity Questionnaire for Adolescents (aged >11 years, PAQ-A) or for Children (aged <11 years, PAQ-C). The associations between VO2max and PAQ were analyzed using ANCOVA adopting PAQ and PAQ2 as covariates, but allowing the intercepts and slope parameters of PAQ and PAQ2 to vary with the categorical variables sex, age group and weight status. Results: ANCOVA identified a curvilinear association between VO2max and PAQ, with positive linear PAQ terms that varied for both sex and weight status but with a negative PAQ2 term -0.39 (95{\%}CI -0.57 to -0.21) that was common for all age, sex and weight status groups. These curvilinear (inverted U) associations suggests that the benefits of increasing PA (same dose) on VO2max is greater when children report low levels of PA compared to children who report higher levels of PA. These dose-response rates were also steeper for boys, and steeper in lean compared with overweight/obese children. Conclusions: Health practitioners should be aware that encouraging greater PA (same dose) in inactive and underweight children will result in greater gains in VO2max (response) compared with their active and overweight/obese counterparts.",
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AU - Sandercock, Gavin

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N2 - Background: This study sought to explore the dose-response rate/association between VO2max and self-reported physical activity (using PAQ), and to assess whether this association varies by sex, age and weight status. Methods: VO2max was assessed using the 20-metre shuttle-run test. Physical Activity (PA) was assessed using the Physical Activity Questionnaire for Adolescents (aged >11 years, PAQ-A) or for Children (aged <11 years, PAQ-C). The associations between VO2max and PAQ were analyzed using ANCOVA adopting PAQ and PAQ2 as covariates, but allowing the intercepts and slope parameters of PAQ and PAQ2 to vary with the categorical variables sex, age group and weight status. Results: ANCOVA identified a curvilinear association between VO2max and PAQ, with positive linear PAQ terms that varied for both sex and weight status but with a negative PAQ2 term -0.39 (95%CI -0.57 to -0.21) that was common for all age, sex and weight status groups. These curvilinear (inverted U) associations suggests that the benefits of increasing PA (same dose) on VO2max is greater when children report low levels of PA compared to children who report higher levels of PA. These dose-response rates were also steeper for boys, and steeper in lean compared with overweight/obese children. Conclusions: Health practitioners should be aware that encouraging greater PA (same dose) in inactive and underweight children will result in greater gains in VO2max (response) compared with their active and overweight/obese counterparts.

AB - Background: This study sought to explore the dose-response rate/association between VO2max and self-reported physical activity (using PAQ), and to assess whether this association varies by sex, age and weight status. Methods: VO2max was assessed using the 20-metre shuttle-run test. Physical Activity (PA) was assessed using the Physical Activity Questionnaire for Adolescents (aged >11 years, PAQ-A) or for Children (aged <11 years, PAQ-C). The associations between VO2max and PAQ were analyzed using ANCOVA adopting PAQ and PAQ2 as covariates, but allowing the intercepts and slope parameters of PAQ and PAQ2 to vary with the categorical variables sex, age group and weight status. Results: ANCOVA identified a curvilinear association between VO2max and PAQ, with positive linear PAQ terms that varied for both sex and weight status but with a negative PAQ2 term -0.39 (95%CI -0.57 to -0.21) that was common for all age, sex and weight status groups. These curvilinear (inverted U) associations suggests that the benefits of increasing PA (same dose) on VO2max is greater when children report low levels of PA compared to children who report higher levels of PA. These dose-response rates were also steeper for boys, and steeper in lean compared with overweight/obese children. Conclusions: Health practitioners should be aware that encouraging greater PA (same dose) in inactive and underweight children will result in greater gains in VO2max (response) compared with their active and overweight/obese counterparts.

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