McGarty Arlene M, Penpraze Victoria, Melville Craig A
Institute of Health and Wellbeing, College of Medical, Veterinary and Life Sciences, University of Glasgow, Gartnavel Royal Hospital, 1055 Great Western Road, Glasgow, G12 0XH Scotland UK.
School of Life Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, Scotland UK.
Pilot Feasibility Stud. 2015 May 24;1:18. doi: 10.1186/s40814-015-0014-2. eCollection 2015.
Accelerometry has not been calibrated for the estimation of physical activity in children with intellectual disabilities (ID), raising questions regarding the validity of interpreting accelerometer data in this population. Various protocols and criterion measures have been used in calibration studies involving typically developing (TD) children; however, the suitability of these activities and measures for children with ID is unknown. Therefore, this study aimed to test the feasibility of a laboratory-based calibration protocol for children with ID. Specifically, the feasibility of activities, measurements, and recruitment was investigated.
Five children with mild to moderate ID (10.20 ± .98 years) and a comparative sample of five TD children (12.40 ± .01 years) participated in this study. Participants performed a free-living and treadmill-based activity protocol during two laboratory-based sessions. Activities were performed for 5 min and ranged from sedentary to vigorous intensity. Treadmill activities ranged from 3 to 8 km/h, and free-living activities included watching a DVD, passing a football, and jumping jacks. Resting energy expenditure was measured, and a graded exercise test was used to assess cardiorespiratory fitness. Breath-by-breath respiratory gas exchange and accelerometry were continually measured during all activities. Feasibility was assessed using observations, activity completion rates, and respiratory data.
All TD participants and one participant with ID completed the protocol. The physical demands of the treadmill activities affected the completion rate for participants with ID. No participant met the maximal criteria for the graded exercise test or attained a steady state during the resting measurements. Limitations were identified with the usability of respiratory gas exchange equipment and the validity of measurements. The school-based recruitment strategy was not effective, with a participation rate of 6 %. A significant ( = 13.21, < .0001) difference in the relationship of [Formula: see text] and accelerometry was identified between ID and TD participants.
Due to issues with the usability and validity of breath-by-breath respiratory gas exchange and recruitment, a laboratory-based calibration protocol is currently not feasible for children with ID. An alternative field-based protocol with a non-invasive criterion measure should be considered for future studies.
加速度计尚未针对智力残疾（ID）儿童的身体活动估计进行校准，这引发了关于在该人群中解释加速度计数据有效性的问题。在涉及发育正常（TD）儿童的校准研究中使用了各种方案和标准测量方法；然而，这些活动和测量方法对ID儿童的适用性尚不清楚。因此，本研究旨在测试基于实验室的校准方案对ID儿童的可行性。具体而言，研究了活动、测量和招募的可行性。
五名轻度至中度ID儿童（10.20±.98岁）和五名TD儿童的对照样本（12.40±.01岁）参与了本研究。参与者在两次基于实验室的课程中执行了基于自由生活和跑步机的活动方案。活动进行5分钟，强度从久坐到剧烈。跑步机活动速度为3至8公里/小时，自由生活活动包括观看DVD、传球和做开合跳。测量静息能量消耗，并使用分级运动试验评估心肺适能。在所有活动期间持续测量逐次呼吸的呼吸气体交换和加速度计数据。使用观察结果、活动完成率和呼吸数据评估可行性。
所有TD参与者和一名ID参与者完成了方案。跑步机活动的体力需求影响了ID参与者的完成率。没有参与者达到分级运动试验的最大标准或在静息测量期间达到稳定状态。确定了呼吸气体交换设备的可用性和测量有效性方面的局限性。基于学校的招募策略无效，参与率为６％。在ID和TD参与者之间，[公式：见正文]与加速度计的关系存在显著差异（=13.21，<.0001）。
由于逐次呼吸的呼吸气体交换的可用性和有效性以及招募方面的问题，基于实验室的校准方案目前对ID儿童不可行。未来的研究应考虑采用具有非侵入性标准测量方法的替代现场方案。
