Primary Prevention Clinical Trial
Official title:
The Use of Lactate Thresholds to Individualize Accelerometer Cut-points and Objectively Assess Physical Activity Levels in Postmenopausal Women
The purpose of this study is to accurately assess weekly physical activity levels of postmenopausal women using lactate thresholds to individualize the accelerometer cut-points.
This observational study aims to accurately assess weekly physical activity levels of
postmenopausal women using lactate thresholds to individualize the accelerometer cut-points.
Postmenopausal women will be recruited from local advertisements in public health centers.
Each woman will perfom on different days a progressive discontinuous submaximal
walking-running test and several constant speed tests wearing an accelerometer to identify
the individual lactate threshold (LT), the maximal lactate steady state (MLSS) and the
corresponding accelerometer activity counts/min (cpm). Participants then will wear an
actigraph accelerometer (wGT3X-BT) for seven days.
Linear regression equations will be developed for each participant to determine
accelerometer activity counts for each intensity level: 1) sedentary behaviour (<200 cpm),
2) light intensity (200 cpm to activity counts at LT), 3) moderate intensity (activity
counts between LT and MLSS) and 4) vigorous intensity (activity counts >MLSS). Physical
activity levels will be measured using both, individualized approach and Sasaki, Jonh and
Freedson´s (2011) absolute cut-points obtained through walking and running activities
eliciting 3-6 MET intensities (2689-6166 cpm), considering it a "moderate" effort.
;
Observational Model: Case-Only, Time Perspective: Cross-Sectional
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