Takacs Judit, Pollock Courtney L, Guenther Jerrad R, Bahar Mohammadreza, Napier Christopher, Hunt Michael A
Department of Physical Therapy, University of British Columbia, Canada.
Department of Physical Therapy, University of British Columbia, Canada.
J Sci Med Sport. 2014 Sep;17(5):496-500. doi: 10.1016/j.jsams.2013.10.241. Epub 2013 Oct 31.
In order to quantify the effects of physical activity such as walking on chronic disease, accurate measurement of physical activity is needed. The objective of this study was to determine the validity and reliability of a new activity monitor, the Fitbit One, in a population of healthy adults.
Cross-sectional study.
Thirty healthy adults ambulated at 5 different speeds (0.90, 1.12, 1.33, 1.54, 1.78 m/s) on a treadmill while wearing three Fitbit One activity monitors (two on the hips and one in the pocket). The order of each speed condition was randomized. Fitbit One step count output was compared to observer counts and distance output was compared to the calibrated treadmill output. Two-way repeated measures ANOVA, concordance correlation coefficients, and Bland and Altman plots were used to assess validity and intra-class correlation coefficients (ICC) were used to assess reliability.
No significant differences were noted between Fitbit One step count outputs and observer counts, and concordance was substantial (0.97-1.00). Inter-device reliability of the step count was high for all walking speeds (ICC ≥ 0.95). Percent relative error was less than 1.3%. The distance output of the Fitbit One activity monitors was significantly different from the criterion values for each monitor at all speeds (P<0.001) and exhibited poor concordance (0.0-0.05). Inter-device reliability was excellent for all treadmill speeds (ICC ≥ 0.90). Percent relative error was high (up to 39.6%).
The Fitbit One activity monitors are valid and reliable devices for measuring step counts in healthy young adults. The distance output of the monitors is inaccurate and should be noted with caution.
为了量化诸如步行等身体活动对慢性病的影响，需要准确测量身体活动。本研究的目的是确定一种新型活动监测器Fitbit One在健康成年人群中的有效性和可靠性。
横断面研究。
30名健康成年人在跑步机上以5种不同速度（0.90、1.12、1.33、1.54、1.78米/秒）行走，同时佩戴三个Fitbit One活动监测器（两个戴在臀部，一个放在口袋里）。每种速度条件的顺序是随机的。将Fitbit One的步数输出与观察者计数进行比较，距离输出与校准后的跑步机输出进行比较。采用双向重复测量方差分析、一致性相关系数以及Bland和Altman图来评估有效性，采用组内相关系数（ICC）来评估可靠性。
Fitbit One的步数输出与观察者计数之间未发现显著差异，一致性良好（0.97 - 1.00）。所有步行速度下，步数计数的设备间可靠性都很高（ICC≥0.95）。相对误差百分比小于1.3%。Fitbit One活动监测器的距离输出在所有速度下与每个监测器的标准值均有显著差异（P<0.001），一致性较差（0.0 - 0.05）。所有跑步机速度下，设备间可靠性都很好（ICC≥0.90）。相对误差百分比很高（高达39.6%）。
Fitbit One活动监测器是测量健康年轻成年人步数的有效且可靠的设备。监测器的距离输出不准确，应谨慎使用。
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