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Physical activity in German adolescents measured by accelerometry and activity diary: introducing a comprehensive approach for data management and preliminary results.

Pfitzner R, Gorzelniak L, Heinrich J, von Berg A, Klümper C, Bauer CP, Koletzko S, Berdel D, Horsch A, Schulz H, GINIplus Study Gro - PLoS ONE (2013)

Bottom Line: Girls also frequently reported dancing and gymnastics (23%).The diary is vital for the identification of invalid data and non-compliant participants.Preliminary results suggest that four out of five German adolescents do not meet WHO recommendations for PA and that school sport contributes only little to MVPA.

View Article: PubMed Central - PubMed

Affiliation: Institute of Epidemiology I, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.

ABSTRACT

Introduction: Surveillance of physical activity (PA) is increasingly based on accelerometry. However, data management guidelines are lacking. We propose an approach for combining accelerometry and diary based PA information for assessment of PA in adolescents and provide an example of this approach using data from German adolescents.

Methods: The 15-year-old participants comprised a subsample the GINIplus birth cohort (n = 328, 42.4% male). Data on PA was obtained from hip-worn accelerometers (ActiGraph GT3X) for seven consecutive days, combined with a prospective activity diary. Major aspects of data management were validity of wear time, handling of non-wear time and diary comments. After data cleaning, PA and percentage of adolescents meeting the recommendations for moderate-to-vigorous activity (MVPA) per day were determined.

Results: From the 2224 recorded days 493 days (25%) were invalid, mainly due to uncertainties relating to non-wear time (322 days). Ultimately, 269 of 328 subjects (82%) with valid data for at least three weekdays and one weekend day were included in the analysis. Mean MVPA per day was 39.1 minutes (SD ±25.0), with boys being more active than girls (41.8±21.5 minutes vs. 37.1±27.8 minutes, p<0.001). Accordingly, 24.7% of boys and 17.2% of girls (p<0.01) met the WHO recommendations for PA. School sport accounted for only 6% of weekly MVPA. In fact, most MVPA was performed during leisure time, with the majority of adolescents engaging in ball sports (25.4%) and endurance sports (19.7%). Girls also frequently reported dancing and gymnastics (23%).

Conclusion: For assessment of PA in adolescents, collecting both accelerometry and diary-based information is recommended. The diary is vital for the identification of invalid data and non-compliant participants. Preliminary results suggest that four out of five German adolescents do not meet WHO recommendations for PA and that school sport contributes only little to MVPA.

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Percentage of girls and boys with at least 60 minutes of MVPA according to weekday (Mon-Sun).Differences between days were not significant in boys and of borderline significance in girls (p<0.054). *Significant differences between boys and girls, p = 0.02.
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pone-0065192-g004: Percentage of girls and boys with at least 60 minutes of MVPA according to weekday (Mon-Sun).Differences between days were not significant in boys and of borderline significance in girls (p<0.054). *Significant differences between boys and girls, p = 0.02.

Mentions: The proportions of adolescents who reach 60 minutes of MVPA a day was analysed according to sex and weekday (Figure 4). In the total sample the proportion of those meeting the WHO recommendations was evenly distributed throughout the week and ranged between 18.6% and 23.2% (ns). The sex stratified analysis showed that adolescents being compliant with the recommendations was significantly higher in boys compared to girls, on average 24.9% vs. 17.2% (p = 0.0003, Table 2). Significant differences between days were not detectable in boys although the Figure suggests that the proportion of those being compliant with the WHO recommendation was about 25% on all weekdays, except on Tuesday (30.7%), and somewhat lower during the weekend (19%, p = 0.53). Over the course of the week, a lower but more constant proportion of girls were engaged in at least 60 minutes of MVPA per day. The proportion ranged between 14.6% and 18.5%. The day with the lowest proportion of active girls was on Thursdays (14.6%, p = 0.054).


Physical activity in German adolescents measured by accelerometry and activity diary: introducing a comprehensive approach for data management and preliminary results.

Pfitzner R, Gorzelniak L, Heinrich J, von Berg A, Klümper C, Bauer CP, Koletzko S, Berdel D, Horsch A, Schulz H, GINIplus Study Gro - PLoS ONE (2013)

Percentage of girls and boys with at least 60 minutes of MVPA according to weekday (Mon-Sun).Differences between days were not significant in boys and of borderline significance in girls (p<0.054). *Significant differences between boys and girls, p = 0.02.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3672153&req=5

pone-0065192-g004: Percentage of girls and boys with at least 60 minutes of MVPA according to weekday (Mon-Sun).Differences between days were not significant in boys and of borderline significance in girls (p<0.054). *Significant differences between boys and girls, p = 0.02.
Mentions: The proportions of adolescents who reach 60 minutes of MVPA a day was analysed according to sex and weekday (Figure 4). In the total sample the proportion of those meeting the WHO recommendations was evenly distributed throughout the week and ranged between 18.6% and 23.2% (ns). The sex stratified analysis showed that adolescents being compliant with the recommendations was significantly higher in boys compared to girls, on average 24.9% vs. 17.2% (p = 0.0003, Table 2). Significant differences between days were not detectable in boys although the Figure suggests that the proportion of those being compliant with the WHO recommendation was about 25% on all weekdays, except on Tuesday (30.7%), and somewhat lower during the weekend (19%, p = 0.53). Over the course of the week, a lower but more constant proportion of girls were engaged in at least 60 minutes of MVPA per day. The proportion ranged between 14.6% and 18.5%. The day with the lowest proportion of active girls was on Thursdays (14.6%, p = 0.054).

Bottom Line: Girls also frequently reported dancing and gymnastics (23%).The diary is vital for the identification of invalid data and non-compliant participants.Preliminary results suggest that four out of five German adolescents do not meet WHO recommendations for PA and that school sport contributes only little to MVPA.

View Article: PubMed Central - PubMed

Affiliation: Institute of Epidemiology I, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.

ABSTRACT

Introduction: Surveillance of physical activity (PA) is increasingly based on accelerometry. However, data management guidelines are lacking. We propose an approach for combining accelerometry and diary based PA information for assessment of PA in adolescents and provide an example of this approach using data from German adolescents.

Methods: The 15-year-old participants comprised a subsample the GINIplus birth cohort (n = 328, 42.4% male). Data on PA was obtained from hip-worn accelerometers (ActiGraph GT3X) for seven consecutive days, combined with a prospective activity diary. Major aspects of data management were validity of wear time, handling of non-wear time and diary comments. After data cleaning, PA and percentage of adolescents meeting the recommendations for moderate-to-vigorous activity (MVPA) per day were determined.

Results: From the 2224 recorded days 493 days (25%) were invalid, mainly due to uncertainties relating to non-wear time (322 days). Ultimately, 269 of 328 subjects (82%) with valid data for at least three weekdays and one weekend day were included in the analysis. Mean MVPA per day was 39.1 minutes (SD ±25.0), with boys being more active than girls (41.8±21.5 minutes vs. 37.1±27.8 minutes, p<0.001). Accordingly, 24.7% of boys and 17.2% of girls (p<0.01) met the WHO recommendations for PA. School sport accounted for only 6% of weekly MVPA. In fact, most MVPA was performed during leisure time, with the majority of adolescents engaging in ball sports (25.4%) and endurance sports (19.7%). Girls also frequently reported dancing and gymnastics (23%).

Conclusion: For assessment of PA in adolescents, collecting both accelerometry and diary-based information is recommended. The diary is vital for the identification of invalid data and non-compliant participants. Preliminary results suggest that four out of five German adolescents do not meet WHO recommendations for PA and that school sport contributes only little to MVPA.

Show MeSH