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    T

    The Caloric CalculatorAverage Caloric Impact of Childhood Obesity Interventions

    Y. Claire Wang, M, !c, Amber "siao, M#", C. Tracy Orleans, #h, !teven $. %ortma&er, #h

    This activity is available for CM' credit. !ee page A( for information.

    )ac&ground* The childhood obesity epidemic re+ects the daily accumulation of an energygap- e/cess calories consumed over calories e/pended. #opulation0level interventions to

    reverse the epidemic can be assessed by the degree to 1hich they increase energy e/penditureand2or reduce caloric inta&e. "o1ever, no common metric e/ists for such comparative

    assessment.

    #urpose* To develop a common metric, the Average Caloric Impact 3ACI4, for estimating andcomparing population0level effect si5es of a range of childhood obesity interventions.

    Methods* An iterative, collaborative process 1as used to revie1 literature from 6778 to 9:69

    and select illustrative interventions sho1ing effects on youth diet and2or activity levels, energybalance, and 1eight. The ACIs of physical activity interventions 1ere estimated based on

    program reach, fre;uency, duration, and intensity and mean body 1eight of the targeted age andgender group from the 9::7

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    ranging

    E 9:6B American ournal of #reventive Medicine #ublished by 'lsevier Inc. Am #rev Med 9:6B(D394*eB

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    e( Wang et al 2 Am #rev Med 9:6B(D394*eB

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    in TN 1atching is associated 1ith a 6:D.D0&cal increase in net totalenergy inta&e, or a 790&cal increase in energy inta&e for video0 or

    computer0game playing. Their ndings are consistent 1ith a

    111.aLpmonline.org

    http://www.ajpmonline.org/http://www.ajpmonline.org/
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    Wang et al 2 Am #rev Med 9:6B(D394*eBR4a

    Intervention S M'Ts 3minutes2day4 basedb

    3&cal2day4c

    )oys, age in years

    9, basal metabolism rate MN#A, moderate0to0vigorous physical activity #', physical education !#A>O, !ports, #lay, and Active >ecreationfor ids

    previously published randomi5ed trial, 1hich found that reducing

    TN 1atching among children led to lo1er caloric inta&e.68

    It 1as

    hypothesi5ed that children 1ho spend more time 1atching TN orplaying video games may be more e/posed and2or in+uenced by

    food advertising through characters present in commercials and

    interactive games that can shape food preferences and inta&e.6Hesults

    The estimated caloric effect of the 6D interventions in

    the tool, by gender and age group, are summari5ed

    in Tables 9 and B. ?or instance, for high school boys

    and girls, adding 6D minutes of #' time per day for a

    full school year 1as estimated to increase mean energy

    e/penditure by 9D &cal2day replacing !!)s 1ith 1ater

    in schools for the same group 1ould reduce mean

    energy inta&e by 6D &cal2day. ?or this group, ho1ever, anaverage

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    August 9:6B

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    e8

    Wangetal2AmA

    #revMed9

    : 6

    B C

    ( D

    3 9

    4 * e B < e

    6 B

    111aLpmo nlin

    Table 9. Caloric impact of physical activity interventions for average student, by age group

    Inputs for caloric calculations

    Avg.

    caloric

    #opulation 3age Target Avg.1eight impact

    Intervention group, years4 M'Tsa

    3lbs4

    b

    3&cal2day4 Assumptions

    Modeled estimates

    Add 1al&ing at a )oth 39idley et al.

    6B

    Wal&ing to and )oth 39

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    Wangetal2AmA

    #revMed9

    : 6

    B C

    ( D

    3 9

    4 * e B

    < e

    6 B

    eH

    August9:6B

    Table 9. 3continued4

    Inputs for caloric calculations

    Avg.

    caloric

    #opulation 3age Target Avg.1eight impact

    Intervention group, years4 M'Tsa

    3lbs4b

    3&cal2day4 Assumptions

    Ma&e current #' )oth 39idley et al.

    6B

    Implemented for a full academic year.b

    aM'Tse/presses ho1 much energy is needed for physical activities. Caloric impacts e/pressed in this table are calculated assuming the physical activity is above a baseline of 6.: M'Ts 3e/cept 1herenoted, as 1ith implementing !#A>O4, 1hich is the baseline resting metabolic rate 1hen sitting ;uietly.

    bIntervention is applied over a full school year 3on average, 6J: days4. The total caloric impact is averaged over B8D days to account for no change in activity on holidays, 1ee&ends, and summer

    vacation. CATC", The Child and Adolescent Trial for Cardiovascular "ealth M!#A=, The Middle0!chool #hysical Activity and =utrition intervention MN#A, moderate0to0vigorous physical activity #',physicaleducation !#A>O, !ports, #lay, and Active >ecreation for ids TAA%, The Trial of Activity for Adolescent %irls

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    eJ

    Wangetal2AmA

    #revMed9

    : 6

    B C

    ( D

    3 9

    4 * e B < e

    6 B

    111aLpmo nlin

    Table B. Caloric impact of dietary and other interventions for average student by group

    Inputs for caloric calculations

    Affected Avg. caloric#opulation 3age group, population, impact

    Intervention years4 Amounta

    b

    3&cal2day4 Assumptions

    Modeled estimates

    >educe unhealthy All 60o5 bag of chips 6:: 6D( Intervention models estimates based onfood inta&e All per day 6:: DD published caloric values of average bag of

    6 coo&ie per day regular potato chips and single Oreo coo&ie.

    >educe !!) inta&e All 690o5 can per day 6:: 6B8All 9:0o5 bottle per day 6:: 9(:

    Intervention models estimates based onpublished caloric values of average can orbottleof regular caffeinated cola.

    >eplace !!)s 1ith )oth 39

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    Wangetal2AmA

    #revMed9

    : 6

    B C

    ( D

    3 9

    4 * e B

    < e

    6 B

    e7

    August9:6B Table B. 3continued4

    Inputs for caloric calculations

    Affected Avg. caloric#opulation 3age group, population, impact

    Intervention years4 Amounta

    b

    3&cal2day4 Assumptions

    %irls 36Deduce video0 or All 79 6:: 79 !ame calorie change for other age groupscomputer0gamelaying time, 8:inutes2day

    aTheamount designates the current pre0intervention consumption level of the item by the selectedpopulation amounts are &ilocalories unless other1ise specied.

    bThe impact designates the percentage of the selected eligible population that is affected by the intervention.

    cIntervention is applied over a full school year 3on average, 6J: days4. The total caloric impact is averaged over B8D days to account for no change in activity on holidays, 1ee&ends, and summervacation.

    ="A='!,=ational "ealth and =utrition '/amination !urvey=YC,=e1 Yor& City !!), sugar0s1eetened beverage

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    e6: Wang et al 2 Am #rev Med 9:6B(D394*eB

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    Wang et al 2 Am #rev Med 9:6B(D394*eB

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    111.aLpmonline.org

    e69 Wang et al 2 Am #rev Med 9:6B(D394*eBobert Wood ohnson

    ?oundation 3grant no. 8J6894. This 1or& is solely the

    responsibility of the authors and does not represent the

    ofcial vie1s of the >obert Wood ohnson ?oundation.

    =o nancial disclosures 1ere reported by the authors of

    this paper.

    http://www.ajpmonline.org/http://www.caloriccalculator.org/http://www.caloriccalculator.org/http://www.caloriccalculator.org/http://www.ajpmonline.org/
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    August 9:6B

    Wang et al 2 Am #rev Med 9:6B(D394*eBeferences

    6. Trust for AmericaXs "ealth and the >obert Wood ohnson ?oundation.

    ? as in fat* ho1 obesity threatens AmericaXs future 9:69. health0

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    9. Ogden C$, Carroll M, it )O, ?legal M. #reval e nce of obesity and

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    68. 'pstein $", >oemm ich =, >obins o n $, et al. A randomi5ed trial ofthe effects of reduci n g television vie1ing and computer use on body

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