The Use of Lactate Thresholds to Individualize Accelerometer Cut-points and Objectively Assess Physical Activity Levels in Postmenopausal Women
试验速览
- 阶段
- 不适用
- 发起方
- 入组人数
- 80
- 试验地点
- 1
- 主要终点
- Time spent in moderate-to-vigorous physical activities
研究概览
简要总结
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.
详细描述
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.
研究设计
- 研究类型
- Observational
- 观察模型
- Case Only
- 时间视角
- Cross Sectional
入排标准
- 年龄范围
- 50 Years 至 70 Years（Adult, Older Adult）
- 性别
- Female
- 接受健康志愿者
- 是
入选标准
- •Age between 50 and 70 years
- •Surgical or natural menopause (no menstrual periods during at least the last 6 months)
排除标准
- •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)
结局指标
主要结局
Time spent in moderate-to-vigorous physical activities
时间窗: 1 week
The time spent in moderate-to-vigorous physical activities during a week (The participants have to wear an accelerometer attatched at the hip on an elastic belt for a period of 7 days)
次要结局
- aerobic fitness(an average of 1 month)
- accelerometer intensity cut-points(an average of 1 month)
- Number of vertical acceleration peaks during the day(1 week)
研究者
Erreka Gil Rey
Principal Investigator
University of the Basque Country (UPV/EHU)