Andrew Johnson

Dr. Andrew Johnson

orcid

Research Focus & Metrics

Academic Career Length

35Years (1992-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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3 October 2012 in Journal of Autism and Developmental Disorders
Verified
Journal Article
Closed access
PDF file
HBHeather M. Brown
Heather M. Brown
JCJanis Cardy
Janis Cardy
AJAndrew Johnson
Andrew Johnson

LVLeigh M Vanderloo
Leigh M Vanderloo
TTTrish Tucker
Trish Tucker
AJAndrew Johnson
Andrew Johnson
MZMelissa M. Van Zandvoort
Melissa M. Van Zandvoort
SBShauna Burke
Shauna Burke
JIJennifer D. Irwin
Jennifer D. Irwin
The childcare environment represents an appropriate avenue to support physical activity among preschoolers. The aim of this study was two-fold: (1) to measure the physical activity levels of a sample of preschoolers during childcare hours; and (2) to assess which attributes (e.g., space, equipment, policies) within centre-based childcare environments influenced physical activity. Thirty-one preschoolers from 5 childcare centres across London, Canada participated. Actical accelerometers were worn by participants for one day during childcare hours to assess activity levels using a 15 second epoch length. The Environment and Policy Assessment and Observation instrument was used to conduct a full-day evaluation of the childcare environment. On average, participants engaged in 1.54 min/h of moderate-to-vigorous physical activity and 17.42 min/h of total physical activity. Sedentary opportunities, portable and fixed play equipment, and staff behaviour accounted for 49.3% of the variability in moderate-to-vigorous physical activity and 14.1% of the variability in total physical activity, with sedentary opportunities, fixed play equipment, and staff behaviours displaying an inverse relationship. Results emphasize the critical role the childcare environment plays in supporting physical activity among preschoolers.

24 June 2002 in Movement Disorders
Verified
Journal Article
Closed access
PDF file
HHH. Christopher Hyson
H. Christopher Hyson
AJAndrew Johnson
Andrew Johnson
Mandar JogMandar Jog
Mandar Jog

1 January 2009 in International Journal of Audiology
Verified
Journal Article
Open access
DGDanielle Glista
Danielle Glista
SSSusan Scollie
Susan Scollie
MBMarlene Bagatto
Marlene Bagatto
RSRichard Seewald
Richard Seewald
VPVijay Parsa
Vijay Parsa
AJAndrew Johnson
Andrew Johnson
This study evaluated prototype multichannel nonlinear frequency compression (NFC) signal processing on listeners with high-frequency hearing loss. This signal processor applies NFC above a cut-off frequency. The participants were hearing-impaired adults (13) and children (11) with sloping, high-frequency hearing loss. Multiple outcome measures were repeated using a modified withdrawal design. These included speech sound detection, speech recognition, and self-reported preference measures. Group level results provide evidence of significant improvement of consonant and plural recognition when NFC was enabled. Vowel recognition did not change significantly. Analysis of individual results allowed for exploration of individual factors contributing to benefit received from NFC processing. Findings suggest that NFC processing can improve high frequency speech detection and speech recognition ability for adult and child listeners. Variability in individual outcomes related to factors such as degree and configuration of hearing loss, age of participant, and type of outcome measure.

1 March 2018 in Preventive Medicine
Verified
Journal Article
Closed access
STStephanie Truelove
Stephanie Truelove
BBBrianne A. Bruijns
Brianne A. Bruijns
LVLeigh M Vanderloo
Leigh M Vanderloo
KOKathleen T. O'BRien
Kathleen T. O'BRien
AJAndrew Johnson
Andrew Johnson
TTTrish Tucker
Trish Tucker

7 September 2012 in Clinical Rehabilitation
Verified
Journal Article
Closed access
JHJeffrey Holmes
Jeffrey Holmes
MJMary E Jenkins
Mary E Jenkins
AJAndrew Johnson
Andrew Johnson
MHMichael A Hunt
Michael A Hunt
RCRoss Clark
Ross Clark
Background: Impaired postural stability places individuals with Parkinson’s at an increased risk for falls. Given the high incidence of fall-related injuries within this population, ongoing assessment of postural stability is important. Objective: To evaluate the validity of the Nintendo Wii® balance board as a measurement tool for the assessment of postural stability in individuals with Parkinson’s. Subjects: Twenty individuals with Parkinson’s participated. Intervention: Subjects completed testing on two balance tasks with eyes open and closed on a Wii® balance board and biomechanical force platform. Main Measures: Bland–Altman plots and a two-way, random-effects, single measure intraclass correlation coefficient model were used to assess concurrent validity of centre-of-pressure data. Results: Concurrent validity was demonstrated to be excellent across balance tasks (intraclass correlation coefficients = 0.96, 0.98, 0.92, 0.94). Conclusions: This study suggests that the Wii® balance board is a valid tool for the quantification of postural stability among individuals with Parkinson’s.