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ESTIMATING CALORIC EXPENDITURE USING THE PHYSICAL ACTIVITY INDEX (PAI) IN CHILDREN AND ADOLESCENTS PERFORMING A MULTISTAGE MAXIMAL EXERCISE TEST

Gairola, Anjuli (2014) ESTIMATING CALORIC EXPENDITURE USING THE PHYSICAL ACTIVITY INDEX (PAI) IN CHILDREN AND ADOLESCENTS PERFORMING A MULTISTAGE MAXIMAL EXERCISE TEST. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

PURPOSE: The primary purposes of this investigation were (a) to examine the validity of the PAI, (b) to develop a statistical model to predict cumulative Kcal expenditure using PAI as the predictor variable and (c) to develop a statistical model to predict total Kcal expenditure using PAItotal and selected physiological and behavioral measures as the predictor variables for children and adolescents performing load incremented maximal treadmill exercise. The secondary purpose of the study was to develop a prediction model to estimate total Kcal expenditure using the PAI (session) alone and in combination with selected physiological measures as the predictor variables. METHODS: Eighty-four children and adolescents (12.5±2.4 yrs) performed a maximal Bruce treadmill (TM) protocol. During TM, heart rate (HR), oxygen consumption (VO2), rating of perceived exertion (RPE-overall), pedometer step count, and Kcal expenditure were measured. Post-TM, RPE-session was obtained and a physical activity questionnaire administered. The PAI, PAItotal, and PAI (session) were calculated as:
PAI = Cumulative step count x RPE-overall
PAItotal = Total step count x RPE-overall at test termination
PAI (session) = Total step count x RPE-session
RESULTS: Multiple regression analyses revealed a strong, positive relation between the PAI score and VO2 in L.min-1(r=0.607, p<0.05), VO2 in mL.kg-1.min-1 (r=0.725, p<0.05) and HR in beats.min-1 (r=0.755, p<0.05). These findings established a high level of concurrent validity for the PAI. The following models to predict Kcal expenditure were developed:
Model I : Cumulative Kcal = 21.632 + 0.006(PAI) p<0.05, SEE=17.59, r=0.74, r2=0.54.
Model II : Total Kcal = -11.59+0.002(PAItotal)+27.245(VO2max) p<0.05, SEE=15.37, r=0.86, r2=0.739.
Model V : Total Kcal = 38.6 + 0.004(PAIsession), p<0.05, SEE=24.23, r=0.36, r2=0.13.
Model VI : Total Kcal = -64.759+26.998(VO2max)+0.305(HRmax)+0.001 (PAIsession) p<0.05, SEE=10.46, r = 0.918 , r2 = 0.842.
In comparison to the PAI (session), PAI was a stronger predictor of Kcal expenditure during a load incremented treadmill protocol in a sample of children and adolescents. CONCLUSIONS: The PAI has public health implications, provides an easy tool to estimate total physical activity load (i.e. volume x intensity) and predicts Kcal expenditure in children and adolescents performing standard treadmill exercise protocols. Generalizability of findings is limited to healthy children and adolescents performing load incremented maximal treadmill exercise.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Gairola, Anjulianjuligairola@gmail.com
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairRobertson, Robert Rrrobert@pitt.eduRROBERT
Committee CoChairNagle, Elizabeth Fnagle@pitt.eduNAGLE
Committee MemberGoss, Fredric Lgoss@pitt.eduGOSS
Committee MemberKane, Ireneirk1@pitt.eduIRK1
Committee MemberBayles, Constance Mcbayles@pitt.eduCBAYLES
Date: 15 January 2014
Date Type: Publication
Defense Date: 2 October 2013
Approval Date: 15 January 2014
Submission Date: 19 November 2013
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 144
Institution: University of Pittsburgh
Schools and Programs: School of Education > Health and Physical Activity
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: estimating caloric expenditure in children and adolescents using pedometer step counts and RPE scale
Date Deposited: 15 Jan 2014 22:54
Last Modified: 15 Nov 2016 14:15
URI: http://d-scholarship.pitt.edu/id/eprint/20026

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