Children’s physical activity levels and psychological correlates in interactive dance versus aerobic dance

Zan Gao,Tao Zhang,David Stodden

aSchool of Kinesiology,The University of Minnesota,Minneapolis,MN 55455,USA

bDepartment of Kinesiology,Health Promotion&Recreation,University of North Texas,Denton,TX 76203,USA

cDepartment of Health,Exercise and Sport Sciences,Texas Tech University,Lubbock,TX 79409 USA

Children’s physical activity levels and psychological correlates in interactive dance versus aerobic dance

Zan Gaoa,*,Tao Zhangb,David Stoddenc

aSchool of Kinesiology,The University of Minnesota,Minneapolis,MN 55455,USA

bDepartment of Kinesiology,Health Promotion&Recreation,University of North Texas,Denton,TX 76203,USA

cDepartment of Health,Exercise and Sport Sciences,Texas Tech University,Lubbock,TX 79409 USA

Purpose:The purpose of this study was to compare children’s physical activity(PA)levels,self-efficacy,and enjoyment when experiencing dance-exergaming(Dance Dance Revolution,DDR)and aerobic dance in physical education.

Methods:A total of 53 urban fourth grade children were divided into two groups,with one group playing DDR and the other group engaged in aerobic dance.After 15 min,the groups switched activities and continued their respective activities for another 15 min.Participants wore NL-1000 pedometers in four consecutive sessions,and responded to a questionnaire measuring their self-efficacy and enjoyment toward two dance activities at the end of the first session.

Results:Children spent more moderate-to-vigorous PA(MVPA)time(p＜0.01,η2=0.49)in aerobic dance than DDR.Additionally,children reported significantly higher self-efficacy(p＜0.001,η2=0.28)and enjoyment(p＜0.01,η2=0.18)in DDR than in aerobic dance.

Conclusion:Health care professionals and educators may not replace the traditional PAs and sports with interactive video games,but may use exergaming as an excellent addition to promote PA.

Copyright?2013,Shanghai University of Sport.Production and hosting by Elsevier B.V.All rights reserved.

Dance Dance Revolution;Enjoyment;Moderate-to-vigorous physical activity;Self-efficacy

1.Introduction

The prevalence ofchildhood obesity has increased dramatically in the U.S.partially due to physical inactivity in the past decades,1,2which raises serious concerns to the nation’s public health3as obesity is the underlying factor of many chronic diseases such as type 2 diabetes.Participation in regular physical activity(PA)plays a key role in promoting children’s health and well-being.4,5Although school physical education(PE)programs can be an ideal vehicle to contribute significant amount of PA to children’s daily total PA,6,7researchers suggested that PE,unfortunately,have not provided sufficient PA for children.8,9Thus,exploring innovative approaches to promote and maximize children’s PA in PE becomes very critical to health care professionals and educators.

Research evidence has shown that PE content has different effects upon children’s motivation10—12and PA levels.11,12For example,children’s self-efficacy,intrinsic motivation,and PA levels varied as a function of learning content.11,12However, most empirical studies in this area of inquiry have focused on the traditional PAs.The inclusion of active video games (exergaming),which require PA in playing the games,13in PE has been overlooked.Therefore,empirical studies examining the effects of exergaming and its corresponding traditional activity are warranted.

According to Dishman and colleagues,14,15adolescent girls tended to engage in PAs with which they felt competent and enjoyed.In other words,children’s self-efficacy and enjoyment are two often identified correlates of their PA participation.Specifically,self-efficacy refers to the perception of one’s ability to successfully perform a particular task.16It is deemed as a major positive predictor for children’s in-class PA levels in PE.16,17Enjoyment is defined as a positive state of emotion that reflects generalized feelings such as pleasure, liking,and fun.The level of enjoyment is a critical determinant for children’s PA choices.15In fact,Dishman et al.15indicated children’s most frequently reported reason for PA participation was their enjoyment.These psychosocial factors recently have been examined in the exergaming field to explore participants’psychosocial correlates of PA.18,19For instance,Gao and colleagues18suggested that a 9-month Dance Dance Revolution(DDR)program had a positive effect on elementary school children’s self-efficacy and social support.18Gao et al.19also indicated that children’s intrinsic motivation toward DDR was a positive predictor for PA enjoyment and PA behaviors.Hence,self-efficacy and enjoyment,as motivators for PA behaviors,were used as the psychosocial correlates of PA in the present study.

Despite the negative impact of sedentary video games on obesity,exergaming has potential to help promote PA in youth.19—22Currently,exergaming has been increasingly used at schools as an innovative and fun approach to promoting PA.11,23—25For example,DDR combines real physical dancing requiring fast-foot movement with energetic music and visuals,which serves as an important bridge to capture children’s interest and promote a health-enhancing level of PA.23—26Researchers have recently investigated the benefits of exergaming as a means for increasing PA.Empirical studies suggested that exergaming enables light-to-moderate PA,and is effective in promoting children’s PA level24,27,28and psychosocial benefits.18,29However,investigations have primarily been conducted in the laboratory or extracurricular settings with small samples of Non-Hispanic White individuals. Empirical evidence tended to compare children’s PA between exergaming and other traditional exercise or sedentary video games.The comparisons between the effects of dance-exergaming and the corresponding aerobic dance activities on PA levels measured by pedometers and PA psychosocial correlates (e.g.,self-efficacy and enjoyment)remain unanswered. Emerging evidence also suggests that a single-dimension approach(e.g.,effects of DDR on energy expenditure)to studying exergaming may overlook the effects of exergaming on multiple aspects of a child’s physical and psychosocial domains.

In summary,it is evident that exergaming has the potential to exert positive effects on children’s PA and psychosocial beliefs.Yet comparisons between such effects and the effects from traditional aerobic dance exercise remain largely unexplored.Therefore,the purpose of this study was to determine the differences in children’s PA levels and psychosocial correlates of PA(self-efficacy and enjoyment)in DDR and aerobic dance in PE.Based on previous studies,23—28we hypothesized that children would have similar PA levels in DDR and aerobic dance.Second,we hypothesized that children would display higher self-efficacy and enjoyment toward DDR than they would toward aerobic dance in PE.

2.Methods

2.1.Participants

Participants were 53 urban fourth grade children(24 boys, 29 girls;mean age=10.3 years)from an urban public elementary school in the U.S.Approximately 73%of children were from low socioeconomic status families.The inclusion criteria for this study were:a)children aged 10—11 years;b) children attended all the sessions during data collection;and c) children turned in parental informed consent forms and assent forms.All children provided parental permission and assent to participate in this study.Children who had genetic diseases, injuries,or illnesses that limited their participation were excluded.The inclusion criteria were verified through a selfreport questionnaire and classroom teacher reports.Exclusion criteria were verified via information provided in parental consent forms.

2.2.Research design

A repeated measures design was used in this study.All children participated in a 9-month DDR-based program that was integrated in regular PE(three 30-min sessions per week). The class size was about 26.In addition to DDR and aerobic dance,PE classes included other sports and fitness activities, such as jumping rope,volleyball,soccer,etc.Prior to data collection began,the children had 3 weeks’experience with the DDR and aerobic dance(i.e.,9 lessons)respectively.All children wore pedometers under the supervision of the research assistants during that period.Thus the reactive effects to the pedometer and the researchers were minimized.

In the data collection period,participants were divided into two groups during each 30-min PE session,with one group playing DDR and the other group was engaged in aerobic dance for 15 min.The groups then switched dance activities in the second 15 min.Participants wore pedometers in four consecutive sessions;and sequences for playing(DDR or aerobic dance)were count-ordered.They also responded to a questionnaire measuring their self-efficacy and enjoyment toward DDR and aerobic dance at the end of the first PE session.Informed parental consent and child assent were obtained in accordance with University Institutional Review Board and school district requirements prior to the data collection.

The DDR program was offered and monitored by the researcher and research assistants.Detailed information with regard to how to play DDR is presented elsewhere.11In the present study,children played DDR in the Game Mode.Eight DDR stations were set up next to the walls of the gym with each DDR station accommodating two children.Generally,the classroom teachers supervised the class behaviors for the DDRprogram.For the aerobic dance,a well-trained research assistant led the children to dance in the center of the gym.All children had 3 weeks of experiencing DDR and aerobic dance in the same environment before the data collection began,thus the confounding effect of participating the two activities in the same gymnasium was minimized.

2.3.Instruments

2.3.1.PA levels

Participants’PA levels were measured using NL-1000 piezoelectric pedometers(New Lifestyles Inc.,Lee’s Summit, MO,USA).The NL-1000 is an accurate pedometer to measure children’s PA levels in the field settings.30This pedometer has an accurate moderate-to-vigorous PA(MVPA)timer.That is, in addition to accurately counting steps,the NL-1000 also detects the intensity of each step displaying intensity as MVPA time accumulation.30Prior to the study,Vincent and Sidman’s31recommended procedures were followed to validate the pedometers.In particular,the pedometer was shaken vertically 100 times and the error between shaken and recorded steps was examined for each pedometer.Deviation from the 100 shakes for all pedometers was less than 5%.The validation demonstrated that the pedometers could provide accurate step counts and estimated time in MVPA.In this study,children were instructed to reset the pedometers to zero before performing DDR/aerobic dance.Research assistants recorded the steps and MVPA time at the end of the 15-min session.Then children again reset the pedometers to zero before moving to the next 15-min session(i.e.,aerobic dance/ DDR).Their steps and MVPA time also were recorded at the end of the session.In the present study,children’s MVPA times were retrieved directly from the recorded outputs and were used as the outcome variable.

2.3.2.Self-efficacy

To measure children’s self-efficacy,three items were adopted from Gao et al.16Specifically,participants responded to the items using a 5-point Likert-type scale(1=strongly disagree,5=strongly agree),with the item“With regard to DDR/aerobic dance,I have confidence in…”.The answers were:(a)my ability to do well in DDR/aerobic dance;(b)my ability to learn skills well in DDR/aerobic dance;and(c)my performance in DDR/aerobic dance.The means of these items were used as a measure of children’s self-efficacy toward DDR or aerobic dance in PE,respectively.

2.3.3.Enjoyment

The measure of enjoyment was from an assessment instrument used by Ommundsen et al.32Five items were used to assess children’s enjoyment in DDR/aerobic dance with children responding on a 5-point Likert scale as that of self-eff icacy.The five items were:(a)I have more fun playing DDR/ aerobic dance than doing other things;(b)Playing DDR/aerobic dance is the thingilike to do best;(c)I wishicould play more DDR/aerobic dance thaniget chance to;(d)I usually prefer to watch rather than play DDR/aerobic dance;and(e)I really like playing DDR/aerobic dance at school.The means of these items were used as a measure of children perceived enjoyment toward DDR or aerobic dance in PE,respectively.

2.4.Data analyses

All the data(i.e.,MVPA,self-efficacy,and enjoyment) were entered manually into SPSS 15.0(SPSS,Inc.,Chicago, IL,USA).Data were analyzed in four steps.First,Cronbach’s α coefficients were utilized to examine the internal consistency of the self-report measures used in this study.Descriptive statistics(e.g.,means of MVPA time and self-efficacy) were performed.Second,analysis of variance(ANOVA)was used to examine the sequence differences on all the study variables.Additionally,a one-way ANOVA with repeated measures for children’s MVPA was conducted for children’s PA levels with dance condition as the independent variable. Finally,multivariate analysis of variance(MANOVA)with repeated measures for children’s PA correlates(i.e.,self-eff icacy and enjoyment)was performed.The within-subject factor was time(i.e.,two times;one for DDR and one for aerobic dance).The α level of 0.05 was used for all statistical analyses.

3.Results

Cronbach’s α coefficients for self-efficacy and enjoyment are 0.82 and 0.79 for DDR,and 0.80 and 0.78 for aerobic dance,respectively.The coefficients exceeded the minimum recommended value of 0.70,which indicated the self-reported instruments had acceptable internal consistency in the target population.Table 1 shows the descriptive statistics for the whole sample across different dance conditions.In general, children displayed relatively high self-efficacy and enjoyment toward DDR,as the mean scores of these variables were above the midpoint of the measures(i.e.,3).They also had moderate levels of self-efficacy and enjoyment toward aerobic dance. Additionally,children spent approximately 21%of time in MVPA time in DDR and 31%of time in MVPA time in aerobic dance.The ANOVA for the sequence differences indicated that there was no significant difference between the sequences for taking DDR/aerobic dance,F(1,52)=1.32,p＞0.05.

The one-way ANOVA with repeated measures for MVPA time yielded a significant main effect for dance condition, Hotelling’s Trace=0.966,F(1,52)=50.26,p＜ 0.01,η2=0.49.That is,children demonstrated significantly higher MVPA time in aerobic dance than they did in DDR(Table 2). Similarly,the MANOVA with repeated measures yielded a significant main effect for dance condition,Hotelling’s Trace=0.416,F(2,48)=9.97,p＜0.01,η2=0.29.Followup univariate tests indicated that children reported signif icantly higher self-efficacy,F(1,49)=18.81,p＜ 0.01, η2=0.28,and higher enjoyment,F(1,49)=10.57,p＜0.01, η2=0.18,in DDR compared to aerobic dance(Table 3).

Table 1 Descriptive statistics in DDR and aerobic dance groups(mean±SD).

4.Discussion

The purpose of the present study was to investigate whether children’s PA levels and PA correlates(self-efficacy and enjoyment)differed as a function of different aerobic activities (DDRvs.aerobic dance).This study found that fourth grade children exhibited more estimated MVPA time in aerobic dance than they did in DDR.It does not support our first hypothesis,as we anticipated the effect of DDR on children’s PA levels was similar to that of traditional aerobic activity.A number of laboratory-based studies indicated exergaming was an effective approach that may facilitate mild-to-moderate intensity PA promotion,and that the effect sizes(0.17—0.28) of playing exergaming on individuals’heart rate,energy expenditure,and maximum oxygen consumption were equivalent to traditional PAs.21,33As known,DDR has a Workout Mode(i.e.,Workout Mode,Game Mode,and Tutorial Mode) that allows players to track how many calories they burn as they play,and therefore it is considered a good aerobic exercise.However,our finding does not favor exergaming in this regard as compared to aerobic dance in this study.We speculate that,not like Workout Mode which allows fluent flow during playing,Game Mode of DDR used in this study was intermittent in nature because children had to stop and make choices from time to time in this mode.Therefore the PA patterns were not uniform across the DDR session.Second, children focused primarily on feet movement when playing DDR.The activity intensity varies greatly across different games and gaming systems.For example,MVPA is signif icantly greater for games that involve the whole body movement(i.e.,Wii DDR requiring four limbs movement)as compared with lower body.But DDR requires only lower body movement during game playing.

Interestingly,our finding in the present study is in line with several recent exergaming studies using accelerometers as instruments to measure PA in PE.11,29,34For example,Gao and colleagues11suggested that junior high school students werenot physically active in DDR unit in PE.Similarly,Sun34found that fourth grade children displayed significant lower in-class PA levels in exergaming unit than they did in a fitness unit.It is plausible that children played exergaming intermittently in PE setting but consecutively in laboratory settings.In general,a typical PE class is composed of warm-up,instructions,skill practice or drills,game play,and cool down in which a large percentage of PE class time(approximately 30%—40%)is spent in class management and instruction.As such,children’s PAs are intermittent in nature in PE.On the other hand,the studies conducted in laboratory settings are devoted specifically in target activities or performance tests, which minimize the non-activity time.Further explanation for this difference deserves in-depth investigation.

Table 2 ANOVA parameters for physical activity.

Table 3 MANOVA parameters for self-efficacy and enjoyment.

We found that children demonstrated higher self-efficacy and enjoyment toward DDR than they did toward aerobic dance.The findings provide robust support for the second hypothesis.Children’s high self-efficacy in exergaming can be explained by the sources of self-efficacy:35mastery experiences(i.e.,children learned how to play DDR gradually in PE),vicarious experiences(i.e.,children mimicked the dance movements of the dance figures in the screen),and verbal persuasion(i.e.,children received simultaneous feedback from the exergaming system and timely comments from their peers and teachers feedback).In addition,children were encouraged to play DDR at their individual expertise levels,which would prevent the decrease in self-efficacy in face of difficulty.17In aerobic dance,children only had the movement demonstration and occasional performance feedback from the instructor. Therefore,it is not surprising that children reported higher self-efficacy toward DDR.

In general,the empirical studies and literature reviews consistently reported that participants reported enjoyment/ situational interest/intrinsic motivation/liking of and enthusiasm for exergaming.19,21,29,34For instance,Gao29suggested that children were intrinsically motivated toward DDR in PE. Sun34reported that elementary children had higher situational interest in exergaming than in fitness.Even after intervention, children reported enjoying exergaming and indicated they would continue to play if possible.36Apparently,exergaming can capture children’s enjoyment and attract them to engage in the activities.

Considering the fact that aerobic dance is a very physically active exercise as compared to some non-invasion PE contents such as baseball and volleyball,we speculate that the danceexergaming may be appropriate for PE although itaccumulated less MVPA time than aerobic dance.Exergaming also fostered higher self-efficacy and enjoyment among children than aerobic dance.In addition,research indicated positive effects of exergaming on individuals’motor skills such as gross/fine motor skills.37Taken together,exergaming has potential to help children accomplish several important goals in PE as stated by National Association for Sport and Physical Education(e.g.,participate in PA regularly;value PA for enjoyment;and improve motor skills and movement patterns), and it may serve as a good alternative activity in PE.That is, this study provides empirical support for the use of exergaming in PE,as exergaming is promising to intrinsically motivate children to be physically active and provide moderate levels of PA.However,it should be noticed that exergaming can only be used as a component of an effective PE program but not replace the PE curriculum.That is,exergaming,by itself,is not the sole solution to promote PA.It is not a replacement for traditional PA in the real settings.Rather, exergaming may augment our current PAs in PE to promoting PA participation by serving as a fun PA option.

The study findings,while encouraging,have a few limitations.First,there are many other dance activities available for use with children,such as line dance,Wii just Dance,and Xbox 360 Kinect Dance Central.Additional research is warranted to further examine the different effects of those dance activities on children’s PA levels and PA correlates, particularly those effects from different gaming systems(i.e., Wiivs.Kinect).Second,dance is traditionally viewed as a female dominant activity.We only investigated dance in the present study although a large variety of sports/activities are available in exergaming including football and soccer(i.e., Kinect Ultimate Sports).It is important to investigate the effects of different gender appropriate exergaming activities (i.e.,male dominant activity like football,female dominant activity like yoga,and gender neutral activity like running)on children’s PA levels and PA correlates across different genders.Despite these limitations of this exploratory study,the findings are promising in terms of application of exergaming in PE.In summary,educators should not replace the traditional PAs and sports with exergaming in PE.Meanwhile, exergaming can be an excellent addition to promote PA.

1.Ogden CL,Carroll MD,Curtin LR,McDowell MA,Tabak CJ,Flegal KM. Prevalence of overweight and obesity in the United States,1999—2004.JAMA2006;295:1549—55.

2.Ogden CL,Carroll MD,Curtin LR,Lamb MM,Flegal KM.Prevalence of high body mass index in US children and adolescents,2007—2008.JAMA2010;303:242—9.

3.Centers for disease control and prevention,editor.Kids walk-to-school. Availabe at: http://www.cdc.gov/nccdphp/dnpa/kidwalk/. [accessed 08.10.2012].

4.Roberts CK,Barnard RJ.Effects of exercise and diet on chronic disease.J Appl Physiol2005;98:3—30.

5.U.S.Department of Health and Human Services.2008 physical activity guideline for Americans.Washington,D.C:U.S Government;2008.

6.Sallis JF,McKenzie TL,Beets MW,Beighle A,Erwin H,Lee S.Physical education’s role in public health:steps forward and backward over 20 years and HOPE for the future.Res Q Exerc Sport2012;83:125—35.

7.Wright MT,Patterson DL,Cardinal BJ.Increasing children’s physical activity.J Physic Educ Recre Dance2000;71:26—9.

8.Biddle SJH,Gorely T,Stensel DJ.Health-enhancing physical activity and sedentary behaviour in children and adolescents.JSportsSci2004;22:679—701.

9.McKenzie TL,Marshall SJ,Sallis JF,Conway TL.Student activity levels, lesson context,and teacher behavior during middle school physical education.Res Q Exerc Sport2000;71:249—59.

10.Chen A.A theoretical conceptualization for motivation research in physical education:an integrated perspective.Quest2001;53:35—58.

11.Gao Z,Hannon JC,Newton M,Huang C.The effects of curricular activity on students’situational motivation and physical activity levels.Res Q Exerc Sport2011;82:536—44.

12.Gao Z,Xiang P,Lee AM,Kosma M.Effect of learning activity on students’motivation,physical activity participation and effort/persistence.Int Counc Health Physic Educ Recre Sport Dance J Res2011;6:27—33.

13.Staiano AE,Calvert SL.Exergames for physical education courses: physical,social and cognitive benefits.Child Devel Perspe2011;5:93—8.

14.Dishman RK,Motl RW,Saunders R,Felton G,Ward DS,Dowda M,et al. Self-efficacy partically mediates the effect of a school-based physical activity intervention among adolescent girls.Prev Med2004;38:628—36.

15.Dishman RK,Motl RW,Saunders R,Felton G,Ward DS,Dowda M,et al. Enjoyment mediates effects of a school-based physical activity intervention.Med Sci Sports Exerc2005;37:478—87.

16.Gao Z,Lodewyk K,Zhang T.The role of ability beliefs and incentives in middle school students’intentions,cardiovascular fitness,and effort.J Teach Physic Educ2009;28:3—20.

17.Gao Z,Lee AM,Kosma M,Solmon MA.Understanding students’motivation in middle school physical education:examining the mediating role ofself-efficacy on physicalactivity.IntJSportPsychol2010;41:199—215.

18.Gao Z,Huang C,Liu T,Xiong W.Impact of interactive dance games on urban children’s physical activity correlates and behavior.J Exerc Sci Fit2012;10:107—12.

19.Gao Z,Podlog L,Huang C.Associations among children’s situational motivation,physical activity participation,and enjoyment in an interactive dance game.J Sport Health Sci2013;2:122—8.

20.Zhu W.Promoting physical activity using technology.Res Digest2008;9:1—8.

21.Biddiss E,Irwin J.Active video games to promote physical activity in children and youth:a systematic review.Arch Pediatr Adolesc Med2010;164:664—72.

22.Guy S,Ratzki-Leewing A,Gwadry-Sridhar F.Moving beyond the stigma: systematic review of video games and their potential to combat obesity.Int J Hypert2011:179124.http://dx.doi.org/10.4061/2011/179124.

23.Lanningham-Foster L,Jensen TB,Foster RC,Redmond AB,Walker BA, Heinz D,et al.Energy expenditure of sedentary screen time compared with active screen time for children.Pediatrics2006;118:e1831—5.

24.Gao Z,Hannan PF,Xiang P,Stodden D,Valdez V.Urban Latino children’s physical health and academic performance:effect of active video gamebased exercise.Am J Prev Med2013;44:S240—6.

25.Huang C,Gao Z.Associations between students’situational interest, mastery experience,and physical activity levels in an interactive dance game.Psychol Health Med2013;18:233—41.

26.Murphy ECS,Carson L,Neal W,Baylis C,Donley D,Yeateeerrr R.Effects of an exercise intervention using Dance Dance Revolution on endothelial function and other risk factors in overweight children.Int J Pediatr Obes2009;4:205—14.

27.Maddison R,Mhurchu CN,Jull A,Jiang Y,Prapavessis H,Rodgers A. Energy expended playing video console games:an opportunity to increase children’s physical activity?Pediatr Exerc Sci2007;19:334—43.

28.Lanningham-Foster L,Foster RC,McCrady SK,Jensen TB,Mitre N, Levine JA.Activity-promoting video games and increased energy expenditure.J Pediatr2009;154:819—23.

29.Gao Z.Motivated but not active:the dilemmas of incorporating interactive dance into gym class.J Phys Act Health2012;9:794—800.

30.Duncan JS,Schofield G,Duncan EK,Hinckson EA.Effects of age, walking speed,and body composition on pedometer accuracy in children.Res Q Exerc Sport2007;78:420—8.

31.Vincent SD,Sidman CL.Determining measurement error in digital pedometers.Measur Physic Educ Exerc Sci2003;7:19—24.

32.Ommundsen Y,Page A,Ku P,Copper AP.Cross-cultural,age and gender validation of a computerized questionnaire measuring personal, social and environmental associations with children’s physical activity: theEuropean Youth HeartStudy.IntJBehavNutrPhysAct2008;5:1—14.

33.Peng W,Lin J,Crouse J.Is playing exergames really exercising?A metaanalysis of energy expenditure in active video games.Cyberpsychol Behav Soc Netw2011;14:681—8.

34.Sun H.Exergaming impact on physical activity and interest in elementary school children.Res Q Exerc Sport2012;83:212—20.

35.Bandura A.Self-efficacy:the exercise of control.New York,NY:Freeman; 1997.

36.Foley L,Maddison R.Use of active video games to increase physical activity in children:a(virtual)reality?Pediatr Exerc Sci2010;22:7—20.

37.Gunter B.Psychological effects of video games.In:Raessens J, Goldstein F,editors.Handbook of computer game studies.Cambridge: MIT Press;2005.p.145—60.

29 October 2012;revised 23 December 2012;accepted 16 January 2013

*Corresponding author.

E-mail address:gaoz@umn.edu(Z.Gao)

Peer review under responsibility of Shanghai University of Sport

2095-2546/$-see front matter Copyright?2013,Shanghai University of Sport.Production and hosting by Elsevier B.V.All rights reserved. http://dx.doi.org/10.1016/j.jshs.2013.01.005