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Validity of the Fitbit Ace and Moki Devices for Assessing Steps During Different Walking Conditions in Young Adolescents

Xiyao Sun, Stephanie A. Adams, Chuchu Li, Josephine N. Booth, Judy Robertson, and Samantha Fawkner

commonly purchased options ( 10 , 11 ). The features of Fitbit activity devices, including their validity and reliability, have been investigated in a number of empirical studies with adults ( 11 , 18 ). Findings generally suggest that, with adults, Fitbit devices demonstrate an overall tendency to

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Are Unilateral Devices Valid for Power Output Determination in Cycling? Insights From the Favero Assioma Power Meter

Pedro L. Valenzuela, Almudena Montalvo-Perez, Lidia B. Alejo, Mario Castellanos, Jaime Gil-Cabrera, Eduardo Talavera, Alejandro Lucia, and David Barranco-Gil

might, thus, be unable to provide valid estimates of actual PO, particularly at certain cadences or PO levels. In this regard, some studies have assessed the validity of pedal-based devices (eg, Garmin Vector, PowerTap P1, Favero Assioma) using their bilateral version, 3 – 6 but to the best of our

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Differences in Demographic, Behavioral, and Biological Variables Between Those With Valid and Invalid Accelerometry Data: Implications for Generalizability

Paul D. Loprinzi, Bradley J. Cardinal, Carlos J. Crespo, Gary R. Brodowicz, Ross E. Andersen, and Ellen Smit


The exclusion of participants with invalid accelerometry data (IAD) may lead to biased results and/or lack of generalizability in large population studies. The purpose of this study was to investigate whether demographic, behavioral, and biological differences occur between those with IAD and valid accelerometry data (VAD) among adults using a representative sample of the civilian noninstitutionalized U.S. population.


Ambulatory participants from NHANES (2003−2004) who were 20−85 years of age were included in the current study and wore an ActiGraph 7164 accelerometer for 7 days. A “valid person” was defined as those with 4 or more days of at least 10+ hrs of monitoring per day. Among adults (20−85 yrs), 3088 participants provided VAD and 987 provided IAD. Demographic, behavioral, and biological information were obtained from the household interview or from data obtained in a mobile examination center.


Differences were observed in age, BMI, ethnicity, education, smoking status, marital status, use of street drugs, current health status, HDL-cholesterol, C-reactive protein, self-reported vigorous physical activity, and plasma glucose levels between those with VAD and IAD.


Investigators should take into consideration the potential cut-off bias in interpreting results based on data that excludes IAD participants.

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The Validity of Gait Variability and Fractal Dynamics Obtained From a Single, Body-Fixed Triaxial Accelerometer

Dylan Kobsar, Chad Olson, Raman Paranjape, and John M. Barden

A single triaxial accelerometer has the ability to collect a large amount of continuous gait data to quantitatively assess the control of gait. Unfortunately, there is limited information on the validity of gait variability and fractal dynamics obtained from this device. The purpose of this study was to test the concurrent validity of the variability and fractal dynamic measures of gait provided by a triaxial accelerometer during a continuous 10 minute walk in older adults. Forty-one healthy older adults were fitted with a single triaxial accelerometer at the waist, as well as a criterion footswitch device before completing a ten minute overground walk. The concurrent validity of six outcome measures was examined using intraclass correlation coefficients (ICC) and 95% limits of agreement. All six dependent variables measured by the accelerometer displayed excellent agreement with the footswitch device. Mean parameters displayed the highest validity, followed by measures of variability and fractal dynamics in stride times and measures of variability and fractal dynamics in step times. These findings suggest that an accelerometer is a valid and unique device that has the potential to provide clinicians with valid quantitative data for assessing their clients’ gait.

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Reliability and Validity of the Fullerton Functional Fitness Test: An Independent Replication Study

Jacqueline M. Miotto, Wojtek J. Chodzko-Zajko, Jennifer L. Reich, and Melissa M. Supler

A limiting factor in evaluating the functional status of older people is the lack of appropriate measurement tools for assessing functional mobility, muscle strength, aerobic endurance, agility, and flexibility. In this study, the reliability and validity of the seven-item Fullerton Functional Fitness Test (FFT) battery, designed for use with community-dwelling older adults, was examined. The test items were as follows: floor sit-and-reach, back scratch, 8-ft up-and-go, arm curl, 30-s chair stand. 2-min step, and 9-min walk. Seventy-nine participants (42 physically active, 37 sedentary) completed the FFT battery three times within a 2-week period. The test-retest reliability intraclass correlation coefficients were high. Construct validity analysis revealed that five of the seven FFT items discriminated between the physically active and sedentary groups. In conclusion, most of the evidence from the stability reliability and discriminant validity analyses supports the view that the Fullerton FFT battery is a reliable and valid test of functional fitness.

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Validity and Reliability of a Kinematic Device for Measuring the Force Developed during Squatting

Abderrehmane Rahmani, Georges Dalleau, Fabrice Viale, Christophe A. Hautier, and Jean-René Lacour

This study determined the validity and reliability of the kinematic device developed by Bosco et al. (1995) by comparing its peak force, peak velocity, and peak power measurements to data obtained simultaneously with a force platform placed under the subject’s feet. Fifteen international downhill skiers performed maximal half-squats on a guided barbell with masses of 60–180 kg. The coefficient of correlation (r) between the two peak forces (r = 0.85–0.95, p < .001), the two peak velocities (r = 0.74–0.91, p < .001), and the two peak powers (r = 0.85–0.95, p < .001) indicated that the kinematic device measurements were valid. The trial-to-trial reliability of half-squat exercises measured by the kinematic device gave an intraclass coefficient of correlation (CR) of: 0.70-0.90 for peak force, 0.62-0.90 for peak velocity, and 0.57-0.91 for peak power. There were no statistical differences between the two trials. The standard error of the means (SEM%) was less than 5% for peak force, less than 4% for peak velocity, and less than 7% for power. The high CR and low SEM% indicate that the kinematic device is reliable. The movement recorded by the kinematic device accurately described the action measured by the force platform.

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Psychometric Properties of the Hindi Version of SPADI in Overhead Athletes With Shoulder Impingement Syndrome

Saurabh Sharma and M. Ejaz Hussain

can be established by its measurement properties, such as validity and reliability. A vast majority of people in India and abroad (544 million) speak and understand Hindi well, as it is a national language. 10 The SPADI original and its translations (Greek, Spanish, Thai, Tamil, etc.) have undergone

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Physical Activity Health Literacy in Iranian Older Adults: Development and Psychometric Testing

Moeini Babak, Barati Majid, Heidarimoghadam Rashid, Tapak Leili, and Parsamajd Shahryar

version of the tool were examined in Phase 2. Psychometric Properties This phase consisted of examining the tool’s content validity, face validity, and construct validity. In addition, the tool’s internal consistency and stability were examined. Content Validity Content validity was carried out

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Cross-Cultural Adaptation and Validation of the Persian Version of the Functional Arm Scale for Throwers

Masumeh Hessam, Mohammad Hossein Mousavi, Maryam Saadat, and Kellie C. Huxel Bliven

the FAST is the most appropriate measure that capture HRQoL in throwing athletes. Before recommending the use of PRO measures, it is crucial to establish the psychometric properties such as validity, reliability, and responsiveness. 13 A PRO measure is valid if it measures what is planned to be

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Comparison of Fitbit One and ActivPAL3TM in Adults With Multiple Sclerosis in a Free-Living Environment

Golnoush Mehrabani, Douglas P. Gross, Saeideh Aminian, and Patricia J. Manns

number of steps, a surrogate for physical activity levels ( Balto, Kinnett-Hopkins, & Motl, 2016 ). A valid consumer-grade activity tracker in a free-living condition has the potential to provide valuable information as it is easy to use and may be beneficial for documenting individuals’ status in