Electronic Media Exposure and Its Association With Activity-Related Outcomes in Female Adolescents: Cross-Sectional and Longitudinal Analyses

Abstract

. Electronic media exposure and its association with activity-related outcomes in female adolescents: Cross-sectional and longitudinal analyses. Journal of Physical Activity and Health, 6(2) Activity and Health, 2009, 6, 137-143 © 2009 Human Kinetics, Inc. Background: Few investigations have assessed in adolescent girls the cross-sectional and longitudinal associations between elevated exposure to electronic media (EM) and activityrelated outcomes such as compliance with physical activity (PA) standards or cardiorespiratory fitness (CRF). Methods: Four-hundred thirty-seven white and African American girls were assessed at the 8th, 9th, and 12th grades. PA and EM (TV/video watching, electronic games, Internet use) were self-reported, and CRF was estimated using a cycle-ergometer test. Hi EM exposure was defined as ≥four 30-minute blocks/d. Results: 8th-, 9th-, and 12th-grade girls in the Hi EM group showed lower compliance with PA standards and had lower CRF than the Low EM group (P ≤ .03). Girls reporting Hi EM exposure at 8th and 9th grades had lower vigorous PA and CRF levels at 12th grade than girls reporting less EM exposure (P ≤ .03). Conclusion: Girls reporting exposure to EM for 2 or more hours per day are more likely to exhibit and maintain low PA and CRF levels throughout adolescence. These results enhance the scientific basis for current public health recommendations to limit adolescent girls' daily exposure to television, electronic games, and Internet use to a combined maximum of 2 hours.

Excessive sedentary time and low cardiorespiratory fitness in European adolescents: the HELENA study

“…Several previous studies have also examined the associations between sedentariness and CRF 18 19 34–36. However, most of them have used subjective measures of sedentariness such as television viewing, computer use or screen time (television+computer).…”

“…Sedentary activities have been defined as “activities that do not increase energy expenditure substantially above the resting level”, that is, activities that involve energy expenditure of <1.5 metabolic equivalents,17 such as lying down, sitting and watching television. Overall, previous studies defined sedentary behaviours as time in screen time (television+computer) to examine the associations between sedentariness and CRF 18 19. Nevertheless, these sedentary behaviours are far from capturing the total amount of everyday sedentary time in both adults and young people 20 21.…”

Associations between internet use and fitness among college students: an experience sampling approach

“…Previous work has illustrated that decreased physical activity is associated with more time spent on the internet [7,8]. Higher levels of media exposure in general have been associated with less time doing vigorous physical activity [9]. Conversely, another study found little relationship between time spent on the internet and fitness [10].…”

Asociación entre condición física y adiposidad en escolares de Montería, Colombia / Associations Between Physical Fitness and Adiposity Among School-Age Children from Monteria, Colombia

“…Otro mecanismo sugiere que el comportamiento sedentario puede estar mediando la asociación. Es sabido que el sedentarismo está asociado a una mayor ingesta calórica (56), al tiempo que desplaza el tiempo para la realización de actividad física (57), conduciendo a una reducción de la CCR (8,58), y a un incremento de la adiposidad (59). La composición genética es otro mecanismo propuesto, sugiere que la composición genética explica en parte la asociación entre adiposidad excesiva y baja CCR, y se basa en la presencia de un polimorfismo genético para adiposidad y capacidad física, de hecho, ya se han encontrado genes relacionados con la CCR (60) y con la adiposidad en exceso (61).…”