Re-evaluation of accelerometer thresholds for MVPA at age 16 in subjects pdreviously studied at age 12

A. Griffiths, C. Mattocks, A.R. Ness, K. Tilling, C. Riddoch, S. Leary

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Abstract

Background: A study deriving a threshold for moderate- to vigorous-intensity physical activity (MVPA) in terms of accelerometer counts in 12-year-old children was repeated with a subset of the same children at 16 years. Methods: Fifteen girls and thirty boys took part in 6 activities (lying, sitting, slow walking, walking, hopscotch and jogging) while wearing an Actigraph 7164 accelerometer and a Cosmed K4b2 portable metabolic unit. Random intercepts modeling was used to estimate cut points for MVPA (defined as 4 METs). Results: Using a single model, the sex-specific thresholds derived for MVPA at 16 years were some way below the 3600 counts/minute used for both sexes at age 12, particularly for girls. However graphical examination suggested that a single model might be inadequate to describe both higher- and lower-intensity activities. Models using only lower-intensity activities close to the 4 METs threshold supported retention of the 3600 counts/minute cut point for both sexes. Conclusions: When restricting to lower-intensity activities only, these data do not provide sufficient evidence to change the previously established cut point of 3600 counts/minute to represent MVPA. However, further data and more sophisticated modeling techniques are required to confirm this decision.
Original languageEnglish
Pages (from-to)1163-1167
Number of pages5
JournalJournal of Physical Activity & Health
Volume9
Issue number8
Publication statusPublished - 2012

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Griffiths, A., Mattocks, C., Ness, A. R., Tilling, K., Riddoch, C., & Leary, S. (2012). Re-evaluation of accelerometer thresholds for MVPA at age 16 in subjects pdreviously studied at age 12. Journal of Physical Activity & Health, 9(8), 1163-1167.

Re-evaluation of accelerometer thresholds for MVPA at age 16 in subjects pdreviously studied at age 12. / Griffiths, A.; Mattocks, C.; Ness, A.R.; Tilling, K.; Riddoch, C.; Leary, S.

In: Journal of Physical Activity & Health, Vol. 9, No. 8, 2012, p. 1163-1167.

Research output: Contribution to journalArticle

Griffiths, A, Mattocks, C, Ness, AR, Tilling, K, Riddoch, C & Leary, S 2012, 'Re-evaluation of accelerometer thresholds for MVPA at age 16 in subjects pdreviously studied at age 12', Journal of Physical Activity & Health, vol. 9, no. 8, pp. 1163-1167.
Griffiths, A. ; Mattocks, C. ; Ness, A.R. ; Tilling, K. ; Riddoch, C. ; Leary, S. / Re-evaluation of accelerometer thresholds for MVPA at age 16 in subjects pdreviously studied at age 12. In: Journal of Physical Activity & Health. 2012 ; Vol. 9, No. 8. pp. 1163-1167.
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AU - Leary, S.

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