Physical activity accumulation along the intensity spectrum differs between children and adults
Rantalainen, T., Ridgers, N. D., Gao, Y., Belavý, D. L., Haapala, E. A., & Finni, T. (2021). Physical activity accumulation along the intensity spectrum differs between children and adults. European Journal of Applied Physiology, 121(9), 2563-2571. https://doi.org/10.1007/s00421-021-04731-3
Published inEuropean Journal of Applied Physiology
DisciplineBiomekaniikkaLiikuntalääketiedeGerontologia ja kansanterveysBiomechanicsSports and Exercise MedicineGerontology and Public Health
© 2021 the Authors
Purpose Detailed exploration of physical activity accumulation with fine grading along the intensity spectrum has indicated the potential pragmatic utility of such an approach. However, it is currently unclear what sorts of accumulation patterns along particular intensity bands are found in the children and adult populations. Therefore, we conducted a comparison of activity accumulation in specific intensity bands between four distinct populations: children, adults with sedentary lifestyles, habitual joggers, habitual marathon runners. Methods Free-living waist-worn accelerometry records from 28 children aged 7 to 11, and 61 adults aged 25 to 35 were analysed. Activity intensity was evaluated in 5 s non-overlapping epochs as mean amplitude deviation (MAD) and normalised to acceleration intensities corresponding to walking at 3 metabolic equivalents of a task (METs). Adult data were normalised to 0.091 g MAD based on literature, and data from children to 0.170 g MAD based on laboratory experimentation. The normalised epoch values were divided into 100 intensity gradations. Results Children accumulated more activity in 0.74 to 1.58 normalised acceleration intensities (all p < 0.005) compared to adults. Adult joggers/runners accumulated more activity in normalised acceleration intensities from 7.1 to 11.1 compared to the other groups (p < 0.008). Conclusion The primary bulk of children’s free-living activities are of relatively low intensity not likely to provoke cardiometabolic improvement. These sorts of explorations could be used in informing intervention development aiming at optimising healthy development. Evidence is mounting to justify randomised controlled trials based on intervention targets identified based on exploring the intensity spectrum. ...
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- Liikuntatieteiden tiedekunta 
Related funder(s)Academy of Finland; Ministry of Education and Culture
Funding program(s)Research costs of Academy Research Fellow, AoF; Research post as Academy Research Fellow, AoF; Others
Additional information about fundingOpen access funding provided by University of Jyväskylä (JYU). Parts of the study were funded by the Ministry of Education and Culture of Finland (OKM/59/626/2016). This project was partially supported by the School of Exercise and Nutrition Sciences, Deakin University (Grant ID: Belavy 2014–2017). TR was an Academy Research Fellow during the preparation of this manuscript (Academy of Finland Grant Numbers 321336 and 328818). NDR is supported by a National Heart Foundation of Australia Future Leader Fellowship (ID101895). YG acknowledges the support from the National Natural Science Foundation of China (nos. 82003485 and 82111530074). ...
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