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British Journal of Sports Medicine 2008;42:592-594
Copyright © 2008 BMJ Publishing Group Ltd & British Association of Sport and Exercise Medicine
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EXERCISE MEDICINE HIGHLIGHTS FROM THE BMJ

Energy expenditure in adolescents playing new generation computer games

Lee Graves, Gareth Stratton, N D Ridgers, N T Cable

Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Henry Cotton Campus, Liverpool L3 2ET

Correspondence to:
G Stratton g.stratton{at}ljmu.ac.uk


*    ABSTRACT
TOP
ABSTRACT
INTRODUCTION
 METHOD
 RESULTS
 DISCUSSION
 CONCLUSION
 REFERENCES
 
Objective: To compare the energy expenditure of adolescents when playing sedentary and new generation active computer games.

Design: Cross sectional comparison of four computer games. Setting Research laboratories.

Participants: Six boys and five girls aged 13–15 years.

Procedure: Participants were fitted with a monitoring device validated to predict energy expenditure. They played four computer games for 15 minutes each. One of the games was sedentary (XBOX 360) and the other three were active (Wii Sports).

Main outcome measure: Predicted energy expenditure, compared using repeated measures analysis of variance.

Results: Mean (standard deviation) predicted energy expenditure when playing Wii Sports bowling (190.6 (22.2) kl/kg/min), tennis (202.5 (31.5) kl/kg/min), and boxing (198.1 (33.9) kl/kg/min) was significantly greater than when playing sedentary games (125.5 (13.7) kl/kg/min) (P<0.001). Predicted energy expenditure was at least 65.1 (95% confidence interval 47.3 to 82.9) kl/kg/min greater when playing active rather than sedentary games.

Conclusions: Playing new generation active computer games uses significantly more energy than playing sedentary computer games but not as much energy as playing the sport itself. The energy used when playing active Wii Sports games was not of high enough intensity to contribute towards the recommended daily amount of exercise in children.


*    INTRODUCTION
TOP
ABSTRACT
 INTRODUCTION
METHOD
 RESULTS
 DISCUSSION
 CONCLUSION
 REFERENCES
 
Young people are currently recommended to take an hour of moderate to vigorous physical exercise each day, which should use at least three times as much energy as is used at rest.1 2 Many adolescents have mostly sedentary lifestyles,3 however, as a result of a variety of factors. Time spent in front of television and computer screens has been causally linked to physical inactivity and obesity, although the associations are often weak.4

The new generation of wireless based computer games is meant to stimulate greater interaction and movement during play. A recent study reported that playing computer games using a hand held controller while seated increased energy expenditure above resting values by 22%, whereas activity based games that require upper body movements and dance games increased energy expenditure by 108% and 172%, respectively.5 The new generation of computer games could therefore be a useful addition to the range of opportunities for physical activity available to adolescents. Children spend a large amount of time playing computer games,6 and it is difficult to persuade them to relinquish these screen based activities.7 Activity promoting computer games might therefore be a useful way to increase activity in young people. In this study, we measured the energy expenditure of adolescent girls and boys playing Nintendo Wii (active) and Microsoft XBOX 360 (inactive) computer games.


*    METHOD
TOP
ABSTRACT
 INTRODUCTION
 METHOD
RESULTS
 DISCUSSION
 CONCLUSION
 REFERENCES
 
Participants and settings
A convenience sample of five girls and six boys aged 13–15 participated in the study. All participants regularly played sedentary computer games for at least two sessions of two hours each week and had not previously used Wii. All girls and boys were competent at sport; they regularly represented their school at hockey or netball (girls) and rugby or soccer (boys). Parents and adolescents consented to the study.

Anthropometry
We measured height to the nearest 0.1 com using a portable stadiometer and weight to the nearest 0.1 kg using a calibrated mechanical flat scale. Measures were taken using standard anthropometric techniques.8

Familiarisation
On separate days from experimental trials, participants practised playing on the XBOX 360 and Wii computer consoles. For sedentary gaming, participants completed two races on a single player race mode on the game Project Gotham Racing 3 (XBOX 360) using a wireless hand held controller. For activity promoting gaming, participants completed the training modes for bowling, tennis, and boxing on the Wii Sports computer game. During familiarisation participants wore an IDEEA (intelligent device for energy expenditure and activity) system.

Energy expenditure
After at least two hours of fasting and five minutes of supine rest, we measured resting energy expenditure for six minutes using indirect calorimetry and a face mask. Energy expenditure during gaming was predicted using the previously validated IDEEA system, which can identify the type of activity and measure the intensity of physical activity in free living conditions.9

The IDEEA system comprises a small recorder worn at the waist and five sensors attached to three thin and flexible wires that connect to the recorder. Sensors are attached to the centre of the subject’s chest (about 4 cm below the clavicle), the front of each thigh, and the underside of each foot on the outside arch, using porous hypoallergic medical tape. Sensors measure the acceleration and angle of each body segment.10 Before data collection began, we initialised the IDEEA using each participant’s weight, height, age, and sex and calibrated the sensors. After each trial, we analysed the down-loaded and processed data using ActView, a Windows based programme that provides detailed information on the energy expenditure of each activity.

Experimental trial
Each participant performed one experimental trial. The participants first played on Project Gotham Racing 3 (inactive)–they raced against central processing unit opponents for 15 minutes. After a five minute rest they then played on Wii Sports (active). Participants played competitive bowling, tennis, and boxing matches for 15 minutes each, as recommended by Nintendo, with a five minute rest between sports. Once a race, match, or game was completed participants restarted the event and continued to play for 15 minutes. Each child played for a total of 60 minutes.

Data analysis
We hypothesised that participants’ energy expenditure would be greater when playing activity promoting computer games (Wii) than when playing sedentary computer games (XBOX 360). Data were analysed using a one way repeated measures analysis of variance with corrected post hoc paired t tests.11 We used SPSS for statistical analyses and set statistical significance at P<=0.05.


*    RESULTS
TOP
ABSTRACT
 INTRODUCTION
 METHOD
 RESULTS
DISCUSSION
 CONCLUSION
 REFERENCES
 
Table 1 and the figure give the participants’ characteristics and body mass adjusted values for resting energy expenditure and predicted energy expenditure during gaming.


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  		Table 1 Participants’ characteristics and energy expenditure

 


Figure 01
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  		Participants’ mean resting energy expenditure and predicted energy expenditure when playing computer games

 
All games significantly increased predicted energy expenditure above resting energy expenditure (P<0.001). The boys’ predicted energy expenditure was significantly greater than that of the girls during Wii Sports tennis (P = 0.013). Predicted energy expenditure was significantly greater for all activity promoting Wii Sports games than for inactive games on the XBOX 360 (P<0.001). Table 2 compares energy expenditure found in this study with energy expenditure during various sports and activities. More energy is used when actually bowling, boxing, or playing tennis than when playing the Wii versions of these sports.


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  		Table 2 Mean energy expenditure for all participants during gaming and various sports and activities

 

*    DISCUSSION
TOP
ABSTRACT
 INTRODUCTION
 METHOD
 RESULTS
 DISCUSSION
CONCLUSION
 REFERENCES
 
Predicted energy expenditure was at least 51% greater during active gaming than during sedentary gaming. This equates to an increase in energy expenditure of 250 kJ (60 kcal) an hour during active gaming compared with sedentary gaming. In a typical week of computer play for these participants, active gaming rather than passive gaming would increase total energy expenditure by less than 2%;13 14 although this figure is trivial it might contribute to weight management. Active gaming used less energy than authentic bowling, tennis, and boxing, and the exercise was not intense enough to contribute towards the recommended amount of daily physical activity for children.2 Nevertheless, new generation computer games stimulated positive activity behaviours–the children were on their feet and they moved in all directions while performing basic motor control and fundamental movement skills that were not evident during seated gaming. Given the current prevalence of childhood overweight and obesity, such positive behaviours should be encouraged.

Sex comparisons interestingly showed that, although all participants were competent sportspeople, the boys’ predicted energy expenditure during active gaming was greater than that of the girls, significantly so for tennis. Such differences may therefore indicate enhanced interactive effects of active gaming in boys and additional advantages in terms of energy expenditure.

Limitations
The study has several limitations. Firstly, the IDEEA accurately estimates free living and physical activity energy expenditure, but the monitor does not detect arm movements well.9 Energy expenditure may therefore have been underestimated during active gaming, which involves arm movements. The use of this system was supported by a recent method comparison study, however, which used the IDEEA as its criterion measure.15 Secondly, the study was laboratory based and may not have replicated conditions in the home. However, the children followed the instructions provided for home use, and energy responses are unlikely to be significantly different in a home based study. Thirdly, although we detected statistically significant differences in energy expenditure, our study was small and results are applicable only to lean, sports competent 12–15 year old adolescents and to the Wii Sports computer game, which is more active than other Wii games. Finally, we did not randomise the order of gaming during trials. This was because the children’s availability was limited and because we wanted to make the experimental design as efficient as possible.


*    CONCLUSION
TOP
ABSTRACT
 INTRODUCTION
 METHOD
 RESULTS
 DISCUSSION
 CONCLUSION
REFERENCES
 
Activity promoting new generation active computer games significantly increased participants’s energy expenditure compared with sedentary games, but not to the same extent as the authentic sports. Further research is needed to investigate the energy demands of active gaming across sexes, ages, and consoles.


What is already known on this topic
Computer games have been implicated in obesity and Inactivity in young people

Little information is available on the activity levels of young people when playing new generation computer games

 


What this study adds
New generation computer games significantly increased energy expenditure compared with sedentary games

’These increases were of insufficient intensity to contribute towards recommendations for childrens daily exercise

 


*    ACKNOWLEDGMENTS
 
Thanks to Greg Atkinson Liverpool John Moores University for statistical support and to students from Ormskirk school for their participation.

Contributors: GS and NTC conceived the study. NTC secured funding NDR, GS, and LG helped plan and design the study. LG. NDR, and GS collected the data. GS and LG manipulated and analysed the data. GS and LG wrote the manuscript and all authors supplied comments. LG is guarantor.


*    FOOTNOTES
 
Funding: This work was funded by Cake. marketing arm of Nintendo UK.

Competing interests: None declared.

Ethics approval: Liverpool John Moores University ethics committee.

Provenance and peer review: Not commissioned, externally peer reviewed.


*    REFERENCES
TOP
ABSTRACT
 INTRODUCTION
 METHOD
 RESULTS
 DISCUSSION
 CONCLUSION
 REFERENCES
 

  1. Strong WB, Malina RM, Blimkie CL, Daniels SR, Dishman RK, Gutin B, et al. Evidence based physical activity for schoolage youth. J Pediatr 2005; 146: 732–7.[CrossRef][Medline]
  2. Trost SG, Pate RR, Sallis JF, Freedson PS, Taylor WC, Dowda M, et al. Age and gender differences in objectively measured physical activity in youth. Med Sci Sports Exerc 2002; 34: 350–355.[CrossRef][Medline]
  3. Sproston K, Primatesta P. Health survey for England 2002: the health of children and young people. London: The Stationary Office, 2003.
  4. Vandewater EA, Shim M, Caplovitz AG. Linking obesity and activity level with children's television and video game use. J Adolesc 2004; 27: 71–85.[CrossRef][Medline]
  5. 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. Pediatrics 2006; 118: 1831–5.[CrossRef]
  6. Olds T, Ridley K, Dollman J. Screenieboppers and extreme screenies: the place of screen time in the time budgets of 10–13 year-old Australian children. Aust N Z J Public Health 2006; 30: 137–42.[Medline]
  7. Faith MS, Berman N, Heo M, Pietrobelli A, Gallagher D, Epstein LH, et al. Effects of contingent television on physical activity and television viewing in obese children. Pediatrics 2001; 107: 1043–8.[Abstract/Free Full Text]
  8. Lohman TG, Roche AF, Martorell R. Anthropometric standardisation reference manual Champaign, IL: Human Kinetics, 2001.
  9. Zhang K, Pi-Sunyer FX, Boozer CN. Improving energy expenditure estimation for physical activity. Med Sci Sports Exerc 2004; 36: 883–9.[Medline]
  10. Zhang K, Werner P, Sun M, Pi-Sunyer FX, Boozer CN., Measurement of human daily physical activity. Obes Res 2003; 11: 33–40.[Medline]
  11. Field A. Discovering statistics using SPSS for Windows. London: SAGE Publications, 2000.
  12. Ainsworth BE, Haskell WL, Whitt MC, Irwin ML, Swartz AM, Strath SJ, et al. Compendium of physical activities: an update of activity codes and MET intensities. Med Sci Sports Exerc 2000; 32: 498–516.[CrossRef]
  13. Bandini LG, Schoeller DA, Dietz WH. Energy expenditure in obese and nonobese adolescents. Pediatric Res 1990; 27 : 198–203.[Medline]
  14. Lazzer S, Boirie Y, Bitar A, Montaurier C, Vernet J, Meyer M, et al. Assessment of energy expenditure associated with physical activities in free-living obese and nonobese adolescents. Am J Clin Nutr 2003; 78 : 471–9.[Abstract/Free Full Text]
  15. Welk GJ, McClain JJ, Eisenmann JC, Wickel EE. Field Validation of the MTI Actigraph and BodyMedia armband monitor using the IDEEA monitor. Obesity 2007; 15: 918–28.[Medline]




This Article
Right arrow Abstract Freely available
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Services
Right arrow Email this link to a friend
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Right arrow Similar articles in PubMed
Right arrow Add article to my folders
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Google Scholar
Right arrow Articles by Graves, L.
Right arrow Articles by Cable, N T
PubMed
Right arrow PubMed Citation
Right arrow Articles by Graves, L.
Right arrow Articles by Cable, N T
Topic Collections
Right arrow Editor's choice

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