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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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Response rate to accelerometry in the ongoing GINIplus study (date: June 2012).
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pone-0065192-g001: Response rate to accelerometry in the ongoing GINIplus study (date: June 2012).

Mentions: At the time of data evaluation for the present study (June 2012), 1,312 adolescents had given consent to conduct PA measurements by accelerometry. 542 of the 1,312 adolescents (41.3%) had been contacted and asked to monitor PA. Of those contacted, 328 (60.5%) were willing to participate in PA measurements and returned monitors with recorded data up to date (Figure 1). Although consent was given, 157 of 542 adolescents (29.0%) denied participation after receiving monitors. According to comments in the diary, or after phone call, most of the reasons for denial concerned the size and appearance of the monitors. In 57 of 542 cases (10.5%) no response was obtained up to date.


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)

Response rate to accelerometry in the ongoing GINIplus study (date: June 2012).
© Copyright Policy
Related In: Results  -  Collection

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

pone-0065192-g001: Response rate to accelerometry in the ongoing GINIplus study (date: June 2012).
Mentions: At the time of data evaluation for the present study (June 2012), 1,312 adolescents had given consent to conduct PA measurements by accelerometry. 542 of the 1,312 adolescents (41.3%) had been contacted and asked to monitor PA. Of those contacted, 328 (60.5%) were willing to participate in PA measurements and returned monitors with recorded data up to date (Figure 1). Although consent was given, 157 of 542 adolescents (29.0%) denied participation after receiving monitors. According to comments in the diary, or after phone call, most of the reasons for denial concerned the size and appearance of the monitors. In 57 of 542 cases (10.5%) no response was obtained up to date.

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