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

Background:

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.

Methods:

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.

Results:

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.

Conclusions:

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

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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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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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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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Kai-Yu Ho, Brenda Benson Deaver, Tyrel Nelson and Catherine Turner

that typically has a lower camera sampling frequency than other computer-based 2D motion analysis. As individuals with ACLR may exhibit more knee valgus 2 and there is limited data regarding the reliability/validity of using MAA to measure knee movement, it is necessary for validation of using a MAA

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Fernando Klitzke Borszcz, Artur Ferreira Tramontin and Vitor Pereira Costa

correlations ( r  = .61–.90) with the anaerobic threshold (AnT). 11 , 12 The AnT demarcates the highest intensity in which the production and elimination of [La − ] are in equilibrium during an incremental test. 1 The validity of various versions of the FTP test, such as 8-, 20-, and 60-minute TT, in relation

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Simon J. MacLeod, Chris Hagan, Mikel Egaña, Jonny Davis and David Drake

. To optimize the training process and control injury risk, practitioners must be able to utilize valid and reliable methods to monitor individual and team-training loads, 2 because without precise quantification of training load, it is not possible to identify the response to training. 3 Training

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Louise M. Burke and Peter Peeling

involvement of these variables is provided in Table  3 , as well as other specific reviews on dietary standardization prior to performance trials ( Jeacocke & Burke, 2010 ), external sources of motivation ( Halperin et al., 2015 ), and the organization of reliable and valid measurements of performance

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Simon A. Feros, Warren B. Young and Brendan J. O’Brien

ecological validity of the assessment, it is beneficial for controlling environmental factors such as wind, rain, temperature, and humidity, especially when the effects of these variables on fast-bowling skill is not understood. In attempt to enhance the ecological validity of the assessment, 5 of the