Mendelsohn Marissa E, Connelly Denise M, Overend Tom J, Petrella Robert J
Toronto, Ontario, Canada.
Phys Ther. 2008 Jun;88(6):747-56. doi: 10.2522/ptj.20070161. Epub 2008 Mar 13.
Physical therapists and rehabilitation professionals in hospital and long-term care centers are using all-extremity semirecumbent exercise machines in their treatment programs. This study was undertaken to investigate the concurrent validity of values for software-generated metabolic equivalents of task (MET) from an all-extremity semirecumbent exercise machine and directly measured values for MET from a portable metabolic unit across a range of submaximal exercise intensities. A second purpose of this study was to determine the test-retest reliability of oxygen consumption and heart rate responses in older adults between standardized sessions of submaximal all-extremity aerobic exercise.
The study participants were 18 older adults (mean age=82 years, SD=5; 3 women, 15 men) who were living in long-term care centers and who completed 2 test sessions of a standardized exercise protocol 1 week apart. The exercise protocol included a warm-up period, three 4-minute stages of exercise at incremental workload levels, and a cool-down period. The breath-by-breath metabolic data from the portable metabolic unit, heart rate, MET values from the exercise machine, Borg Rating of Perceived Exertion, and watts were recorded continuously throughout the exercise protocol.
The concurrent validity of the MET values from the exercise machine and the portable metabolic unit ranged from very good to excellent on both day 1 and day 2 (r=.85-.97). The test-retest reliability of subjects' heart rate responses and MET values from the portable metabolic unit was moderate to high across submaximal exercise intensities (intraclass correlation coefficients [2,1]=.85-.91).
The exercise machine software-generated MET values were representative of directly measured oxygen consumption values across a range of submaximal intensities during all-extremity semirecumbent exercise in older adults with multisystem impairments.
医院及长期护理中心的物理治疗师和康复专业人员在其治疗方案中使用全身半卧位运动器械。本研究旨在调查全身半卧位运动器械软件生成的任务代谢当量（MET）值与便携式代谢单元直接测量的MET值在一系列次最大运动强度下的同时效度。本研究的第二个目的是确定老年人在次最大全身有氧运动标准化疗程之间，耗氧量和心率反应的重测信度。
研究参与者为18名居住在长期护理中心的老年人（平均年龄 = 82岁，标准差 = 5；3名女性，15名男性），他们在相隔1周的时间内完成了2次标准化运动方案测试。运动方案包括热身期、三个4分钟的递增工作量运动阶段和冷却期。在整个运动方案中持续记录便携式代谢单元的逐次呼吸代谢数据、心率、运动器械的MET值、伯格主观用力程度评分和瓦特数。
运动器械和便携式代谢单元的MET值在第1天和第2天的同时效度均为非常好至优秀（r = 0.85 - 0.97）。在次最大运动强度下，受试者心率反应和便携式代谢单元MET值的重测信度为中等至高（组内相关系数[2,1] = 0.85 - 0.91）。
在患有多系统损伤的老年人进行全身半卧位运动时，运动器械软件生成的MET值代表了一系列次最大强度下直接测量的耗氧量值。
