Calibration and cross-validation of the ActiGraph wGT3X+ accelerometer for the estimation of physical activity intensity in children with intellectual disabilities

Background: Valid objective measurement is integral to increasing our understanding of physical activity and sedentary behaviours. However, no population-specific cut points have been calibrated for children with intellectual disabilities. Therefore, this study aimed to calibrate and cross-validate the first population-specific accelerometer intensity cut points for children with intellectual disabilities. Methods: Fifty children with intellectual disabilities were randomly assigned to the calibration (n = 36; boys = 28, 9.53±1.08yrs) or cross-validation (n = 14; boys = 9, 9.57±1.16yrs) group. Participants completed a semi-structured school-based activity session, which included various activities ranging from sedentary to vigorous intensity. Direct observation (SOFIT tool) was used to calibrate the ActiGraph wGT3X+, which participants wore on the right hip. Receiver Operating Characteristic curve analyses determined the optimal cut points for sedentary, moderate, and vigorous intensity activity for the vertical axis and vector magnitude. Classification agreement was investigated using sensitivity, specificity, total agreement, and Cohen’s kappa scores against the criterion measure of SOFIT. Results: The optimal (AUC = .87−.94) vertical axis cut points (cpm) were ≤507 (sedentary), 1008−2300 (moderate), and ≥2301 (vigorous), which demonstrated high sensitivity (81−88%) and specificity (81−85%). The optimal (AUC = .86−.92) vector magnitude cut points (cpm) of ≤1863 (sedentary), 2610−4214 (moderate), and ≥4215 (vigorous) demonstrated comparable, albeit marginally lower, accuracy than the vertical axis cut points (sensitivity = 80−86%; specificity = 77−82%). Classification agreement ranged from moderate to almost perfect (κ = .51−.85) with high sensitivity and specificity, and confirmed the trend that accuracy increased with intensity, and vertical axis cut points provide higher classification agreement than vector magnitude cut points. Conclusions: This study provides the first valid methods of interpreting accelerometer output in children with intellectual disabilities. The calibrated physical activity cut points are notably higher than existing cut points, thus raising questions on the validity of previous low physical activity estimates in children with intellectual disabilities that were based on typically developing cut point

An investigation of surface EMG shorts derived training load during treadmill running

The purpose of this study was two-fold: (1) to determine the sensitivity of the sEMG shorts-derived training load (sEMG-TL) during different running speeds; and (2) to investigate the relationship between the oxygen consumption, heart rate (HR), rating of perceived exertion (RPE), accelerometry-based PlayerLoadTM (PL), and sEMG-TL during a running maximum oxygen uptake (V˙O2max) test. The study investigated ten healthy participants. On day one, participants performed a three-speed treadmill test at 8, 10, and 12 km·h−1 for 2 min at each speed. On day two, participants performed a V˙O2max test. Analysis of variance found significant differences in sEMG-TL at all three speeds (p < 0.05). A significantly weak positive relationship between sEMG-TL and %V˙O2max (r = 0.31, p < 0.05) was established, while significantly strong relationships for 8 out of 10 participants at the individual level (r = 0.72–0.97, p < 0.05) were found. Meanwhile, the accelerometry PL was not significantly related to %V˙O2max (p > 0.05) and only demonstrated significant correlations in 3 out of 10 participants at the individual level. Therefore, the sEMG shorts-derived training load was sensitive in detecting a work rate difference of at least 2 km·h−1. sEMG-TL may be an acceptable metric for the measurement of internal loads and could potentially be used as a surrogate for oxygen consumption

Children, parents and pets exercising together (CPET) : exploratory randomised controlled trial

Levels of physical activity (PA) in UK children are much lower than recommended and novel approaches to its promotion are needed. The Children, Parents and Pets Exercising Together (CPET) study is the first exploratory randomised controlled trial (RCT) to develop and evaluate an intervention aimed at dog-based PA promotion in families. CPET aimed to assess the feasibility, acceptability and potential efficacy of a theory-driven, family-based, dog walking intervention for 9-11 year olds

Accelerometer use during field-based physical activity research in children and adolescents with intellectual disabilities: a systematic review

Many methodological questions and issues surround the use of accelerometers as a measure of physical activity during field-based research. To ensure overall research quality and the accuracy of results, methodological decisions should be based on study research questions. This paper aims to systematically review accelerometer use during field-based research in children and adolescents with intellectual disabilities. Medline, Embase, Cochrane Library, Web of Knowledge, PsycINFO, PubMed, and a thesis database (up to May 2013) were searched to identify relevant articles. Articles which used accelerometry-based monitors, quantified activity levels, and included ambulatory children and adolescents (≤18 years) with intellectual disabilities were included. Based on best practice guidelines, a form was developed to extract data based on 17 research components of accelerometer use. The search identified 429 articles. Ten full-text articles met the criteria and were included in the review. Many shortcomings in accelerometer use were identified, with the percentage of review criteria met ranging from 12% to 47%. Various methods of accelerometer use were reported, with most use decisions not based on population-specific research. However, a lack of measurement research, e.g., calibration/validation, for children and adolescents with intellectual disabilities is limiting the ability of field-based researchers to make to the most appropriate accelerometer use decisions. The methods of accelerometer use employed can have significant effects on the quality and validity of results produced, which researchers should be more aware of. To allow informed use decisions, there should be a greater focus on measurement research related to children and adolescents with intellectual disabilities

Tankersicherheit Uebersicht ueber alle Zwischenberichte zum FE-Vorhaben MTK 210

SIGLEAvailable from Germanischer Lloyd, Hamburg (DE) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Acceptance and Commitment Approaches for Athletes’ Wellbeing and Performance: The Flexible Mind

Elite sport can be an unforgiving and harsh environment. This book explores psychological predictors of wellbeing and performance excellence in elite level athletes, and presents an innovative approach for optimizing mental wellbeing and sporting performance. Jointly developed by performance psychologists, clinical psychologists and sport scientists the Flexible Mind approach draws on contemporary psychological theory and research to help athletes build ‘psychological flexibility’ - the ability to experience challenging thoughts and emotions and still be true to one’s values. A range of case-studies relating to different sports are used to demonstrate how three core components - Being Present, Being Open and Doing What Matters - can improve athletes’ performance and wellbeing. This book will be a game-changing resource for sports psychologists, mental health practitioners, coaches and support staff who are committed to helping athletes to excel and stay well

Graduate prospects explain undergraduate program standing in university league sports science tables

UK university undergraduate programs are compared by independent subject-specific rankings (Complete, Guardian, Times), based upon data from National Student Survey, Higher Education Statistics Agency, Universities and Colleges Admissions Service, Research Excellence Framework, and the universities. The sports and exercise science program at University of Glasgow, has steadily risen to currently rank as the top UK program. This investigation aimed to identify the underlying factors that explain this. Therefore, we obtained underlying scores for entry standard, student satisfaction, research foundation, graduate prospects, staff-student ratio, expenditure/student, continuation, program support to students, and teaching quality from the ranking providers for years 2010-2024, and statistically modelled which factors significantly affected the rankings. We found that entry standard and graduate prospects strongly correlated significantly with ranking results. Principal component analysis indicated that a model of graduate prospects and entry standard explained 66.2% of the variance in ranking results. Multiple linear regression with all underlying factors included in the model indicated they explained 78% (R2=0.78) of the total variance, while stepwise elimination of insignificant factors identified graduate prospects as the sole factor that significantly affected outcome by explaining 71% (R2=0.71) of the variance. Therefore, the primary predictor of ranking success in UK university league tables for sports science is graduates' professional success (graduate prospects)

Descriptive statistics (mean ± SD) of all participants and participants in the calibration and cross-validation groups.

<p>Descriptive statistics (mean ± SD) of all participants and participants in the calibration and cross-validation groups.</p