Objective Physical Activity Assesment in Postmenopausal Women

Centro de Estudios, Investigación y Medicina del Deporte

Status: Unknown

Conditions: Primary Prevention

Study type: Observational

Funder types: Other

Identifiers

NCT02984553

ACC-01

Details and patient eligibility

About

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.

Full description

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.

Enrollment: 80 patients

Sex: Female

Ages: 50 to 70 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Age between 50 and 70 years
• Surgical or natural menopause (no menstrual periods during at least the last 6 months)

Exclusion criteria

• Body mass index less than 39kg/m2 (obesity class III)
• Osteoporosis
• Presence of low-trauma fractures or severe arthrosis at hip, knees or feet
• Functional limitation to walk fast or altered gait patters and instability
• Presence of any chronic disesase that would impair the cardiovascular (e.g. myocardial infarction, stroke, chronic heart failure), musculoskeletal (osteoporosis, low-trauma fractures) and respiratory systems (COPD) or any disease or medication known to affect bone metabolism (glucocorticoids)