Dept of Exercise Sciences, Brigham Young University, Provo, UT, USA.
J Phys Act Health. 2011 Sep;8(7):1004-13. doi: 10.1123/jpah.8.7.1004.
The purposes of this study were to determine the accuracy and reliability of step counts and energy expenditure as estimated by a pedometer during treadmill walking and to clarify the relationship between step counts and current physical activity recommendations.
One hundred males (n = 50) and females (n = 50) walked at stride frequencies (SF) of 80, 90, 100, 110, and 120 steps/min, during which time step counts and energy expenditure were estimated with a Walk4Life Elite pedometer.
The pedometer accurately measured step counts at SFs of 100, 110, and 120 steps/min, but not 80 and 90 steps/min. Compared with energy expenditure as measured by a metabolic cart, the pedometer significantly underestimated energy expenditure at 80 steps/min and significantly overestimated measured energy expenditure at 90, 100, 110, and 120 steps/min.
The pedometers' inability to accurately estimate energy expenditure cannot be attributed to stride length entered into the pedometer or its ability to measure step counts. Males met 3 criteria and females met 2 criteria for moderate-intensity physical activity at SF of 110 to 120 steps/min. These results provide the basis for defining moderate-intensity physical activity based on energy expenditure and step counts and may lead to an appropriate steps/day recommendation.
本研究旨在确定计步器在跑步机行走时估算的步数和能量消耗的准确性和可靠性，并阐明步数与当前体力活动建议之间的关系。
100 名男性（n=50）和女性（n=50）以 80、90、100、110 和 120 步/分钟的步频行走，在此期间使用 Walk4Life Elite 计步器估算步数和能量消耗。
计步器在 100、110 和 120 步/分钟的步频下准确测量步数，但在 80 和 90 步/分钟的步频下不准确。与代谢车测量的能量消耗相比，计步器在 80 步/分钟时明显低估了能量消耗，在 90、100、110 和 120 步/分钟时明显高估了测量的能量消耗。
计步器无法准确估计能量消耗的原因不能归因于计步器中输入的步长或其测量步数的能力。男性在 110 到 120 步/分钟的步频下满足 3 项中度强度体力活动标准，女性满足 2 项标准。这些结果为基于能量消耗和步数定义中度强度体力活动提供了依据，并可能导致适当的每日步数建议。
