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Karen E. Hancock, Paul Downward, and Lauren B. Sherar

, 2013 ). A more accurate method of capturing behavior, feelings, and contexts simultaneously is via prompted, frequent, real-time self-reports known as ecological momentary assessments (EMA; Shiffman, Stone, & Hufford, 2008 ). A study using smartphone-delivered EMA over 30 days in a small sample ( n

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Robert W. Cox, Rodrigo E. Martinez, Russell T. Baker, and Lindsay Warren

goniometry, is performed in a similar manner to goniometry, but the inclinometer is aligned with the distal limb to measure motion. 2 , 4 , 5 The ease and availability of digital inclinometers, specifically those created as smartphone applications, have anecdotally increased the use of inclinometry for ROM

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Jarle Stålesen, Thomas Westergren, Bjørge Herman Hansen, and Sveinung Berntsen

-grade accelerometers are expensive and require training of research staff, and outcomes are to an extent dependent on data-reduction strategies. 7 Therefore, the feasibility of using research-grade motion sensors with embedded accelerometers is limited. The latest smartphones include several motion-detecting sensors

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Vipul Lugade, Janeesata Kuntapun, Paphawee Prupetkaew, Sirinun Boripuntakul, Eric Verner, and Patima Silsupadol

their daily activities is vital. Nowadays, health care providers are increasingly using smartphones for medical purposes due to their ubiquity, cost effectiveness, and portability ( Camacho et al., 2014 ). In addition, modern smartphones have built-in sensors that can quantify minute by minute activity

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Merrill D. Funk, Cindy L. Salazar, Miriam Martinez, Jesus Gonzalez, Perla Leyva, David Bassett Jr., and Murat Karabulut

goals. Use of activity tracking devices has increased exponentially in recent years and the research analyzing the accuracy of these devices has followed ( Bort-Roig, Gilson, Puig-Ribera, Contreras, & Trost, 2014 ; Evenson, Goto, & Furberg, 2015 ). The number of Americans using smartphones reached 88

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Yuwei Song, Momotaz Begum, Sajay Arthanat, and Dain P. LaRoche

to autonomously evaluate and track STS performance (and, consequently, lower-extremity function) on a daily basis if they can be validated for this purpose. Smartphones and commercially available IMUs usually include an accelerometer that measures accelerations in three dimensions, a gyroscope that

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David R. Howell, Corrine N. Seehusen, Mathew J. Wingerson, Julie C. Wilson, Robert C. Lynall, and Vipul Lugade

clinical utility. Therefore, the purpose of this study was to investigate the reliability and MDC characteristics of a valid 21 smartphone-based assessment of single- and dual-task gait and cognitive performance among uninjured youth athletes as an automated field-based medical device. Methods Study

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Reabias de A. Pereira, José Luiz de B. Alves, João Henrique da C. Silva, Matheus da S. Costa, and Alexandre S. Silva

of these apps, only 2 have been scientifically validated to date (ithlete and HRV4Training). 5 , 6 The rMSSD [root mean square of successive differences between RR intervals] index is available in these apps. Meanwhile, the smartphone app HRV Expert by CardioMood (CardioMood, Moscow, Russia

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Daniel J. Plews, Ben Scott, Marco Altini, Matt Wood, Andrew E. Kilding, and Paul B. Laursen

wishing to use HRV in the field. Photoplethysmography (PPG) is a technological advancement that may allow HRV to be measured simply via a smartphone device. PPG is measured via reflection through the illumination of the skin using a light-emitting diode (LED; eg, the smartphone’s flash) and through

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Paul A. Ullucci, Frank Tudini, and Matthew F. Moran

currently allow smartphone users to assess 3-dimensional movements in real time using various applications. This technology has been found to be both reliable and valid when measuring range of motion in multiple joints, including cardinal plane range of motion of the cervical spine. 9 , 10 There is, however