Department of Counseling, Health & Kinesiology, Texas A&M University-San Antonio, 1 University Way, San Antonio, TX 78224, USA.
Sirindhorn School of Prosthetics and Orthotics, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand.
Sensors (Basel). 2021 Mar 16;21(6):2080. doi: 10.3390/s21062080.
Step counts and oxygen consumption have yet to be reported during the 2-min walk test (2MWT) test in persons with lower-limb amputations (LLA). The purpose of this study was to determine step counts and oxygen consumption during the 2MWT in LLA. Thirty-five men and women walked for two minutes as quickly as possible while wearing activity monitors (ActiGraph Link on the wrist (LW) and ankle (LA), Garmin vivofit3 on the wrist (VW) and ankle (VA), and a modus StepWatch on the ankle (SA), and a portable oxygen analyzer. The StepWatch on the ankle (SA) and the vivofit3 on the wrist (VW) had the least error and best accuracy of the activity monitors studied. While there were no significant differences in distance walked, oxygen consumption (VO) or heart rate (HR) between sexes or level of amputation ( > 0.05), females took significantly more steps than males ( = 0.034), and those with unilateral transfemoral amputations took significantly fewer steps than those with unilateral transtibial amputations ( = 0.023). The VW and SA provided the most accurate step counts among the activity monitors and were not significantly different than hand counts. Oxygen consumption for all participants during the 2MWT was 8.9 ± 2.9 mL/kg/min, which is lower than moderate-intensity activity. While some may argue that steady-state activity has not yet been reached in the 2MWT, it may also be possible participants are not walking as fast as they can, thereby misclassifying their performance to a lower standard.
在下肢截肢者（LLA）的 2 分钟步行测试（2MWT）中，尚未报告步数和耗氧量。本研究的目的是确定 LLA 患者在 2MWT 中的步数和耗氧量。35 名男性和女性尽可能快地行走两分钟，同时佩戴活动监测器（手腕上的 ActiGraph Link（LW）和脚踝上的 ActiGraph Link（LA）、手腕上的 Garmin vivofit3（VW）和脚踝上的 Garmin vivofit3（VA）、脚踝上的 modus StepWatch（SA）和便携式氧气分析仪。脚踝上的 StepWatch（SA）和手腕上的 vivofit3（VW）活动监测器的误差最小，准确性最高。尽管性别或截肢水平之间的行走距离、耗氧量（VO）或心率（HR）没有显著差异（> 0.05），但女性的步数明显多于男性（= 0.034），单侧股骨截肢者的步数明显少于单侧胫骨截肢者（= 0.023）。VW 和 SA 在活动监测器中提供了最准确的步数计数，与手动计数没有显著差异。所有参与者在 2MWT 期间的耗氧量为 8.9 ± 2.9 mL/kg/min，低于中等强度活动。虽然有些人可能认为在 2MWT 中尚未达到稳态活动，但也有可能参与者没有尽可能快地行走，从而将他们的表现错误地归类为较低的标准。
