Cargando…

Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study

AIM: Intervention fidelity refers to the degree to which an experimental manipulation has been implemented as intended, but simple, robust methods for quantifying fidelity have not been well documented. Therefore, we aim to illustrate a rigorous quantitative evaluation of intervention fidelity, usin...

Descripción completa

Detalles Bibliográficos
Autores principales: Taylor, Kathryn L., Weston, Matthew, Batterham, Alan M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4406743/
https://www.ncbi.nlm.nih.gov/pubmed/25902066
http://dx.doi.org/10.1371/journal.pone.0125166
_version_ 1782367823916433408
author Taylor, Kathryn L.
Weston, Matthew
Batterham, Alan M.
author_facet Taylor, Kathryn L.
Weston, Matthew
Batterham, Alan M.
author_sort Taylor, Kathryn L.
collection PubMed
description AIM: Intervention fidelity refers to the degree to which an experimental manipulation has been implemented as intended, but simple, robust methods for quantifying fidelity have not been well documented. Therefore, we aim to illustrate a rigorous quantitative evaluation of intervention fidelity, using data collected during a high-intensity interval training intervention. DESIGN: Single-group measurement study. METHODS: Seventeen adolescents (mean age ± standard deviation [SD] 14.0 ± 0.3 years) attended a 10-week high-intensity interval training intervention, comprising two exercise sessions per week. Sessions consisted of 4-7 45-s maximal effort repetitions, interspersed with 90-s rest. We collected heart rate data at 5-s intervals and recorded the peak heart rate for each repetition. The high-intensity exercise criterion was ≥90% of individual maximal heart rate. For each participant, we calculated the proportion of total exercise repetitions exceeding this threshold. A linear mixed model was applied to properly separate the variability in peak heart rate between- and within-subjects. Results are presented both as intention to treat (including missed sessions) and per protocol (only participants with 100% attendance; n=8). RESULTS: For intention to treat, the median (interquartile range) proportion of repetitions meeting the high-intensity criterion was 58% (42% to 68%). The mean peak heart rate was 85% of maximal, with a between-subject SD of 7.8 (95% confidence interval 5.4 to 11.3) percentage points and a within-subject SD of 15.1 (14.6 to 15.6) percentage points. For the per protocol analysis, the median proportion of high-intensity repetitions was 68% (47% to 86%). The mean peak heart rate was 91% of maximal, with between- and within-subject SDs of 3.1 (-1.3 to 4.6) and 3.4 (3.2 to 3.6) percentage points, respectively. CONCLUSIONS: Synthesising information on exercise session attendance and compliance (exercise intensity) quantifies the intervention dose and informs evaluations of treatment fidelity.
format Online
Article
Text
id pubmed-4406743
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-44067432015-05-07 Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study Taylor, Kathryn L. Weston, Matthew Batterham, Alan M. PLoS One Research Article AIM: Intervention fidelity refers to the degree to which an experimental manipulation has been implemented as intended, but simple, robust methods for quantifying fidelity have not been well documented. Therefore, we aim to illustrate a rigorous quantitative evaluation of intervention fidelity, using data collected during a high-intensity interval training intervention. DESIGN: Single-group measurement study. METHODS: Seventeen adolescents (mean age ± standard deviation [SD] 14.0 ± 0.3 years) attended a 10-week high-intensity interval training intervention, comprising two exercise sessions per week. Sessions consisted of 4-7 45-s maximal effort repetitions, interspersed with 90-s rest. We collected heart rate data at 5-s intervals and recorded the peak heart rate for each repetition. The high-intensity exercise criterion was ≥90% of individual maximal heart rate. For each participant, we calculated the proportion of total exercise repetitions exceeding this threshold. A linear mixed model was applied to properly separate the variability in peak heart rate between- and within-subjects. Results are presented both as intention to treat (including missed sessions) and per protocol (only participants with 100% attendance; n=8). RESULTS: For intention to treat, the median (interquartile range) proportion of repetitions meeting the high-intensity criterion was 58% (42% to 68%). The mean peak heart rate was 85% of maximal, with a between-subject SD of 7.8 (95% confidence interval 5.4 to 11.3) percentage points and a within-subject SD of 15.1 (14.6 to 15.6) percentage points. For the per protocol analysis, the median proportion of high-intensity repetitions was 68% (47% to 86%). The mean peak heart rate was 91% of maximal, with between- and within-subject SDs of 3.1 (-1.3 to 4.6) and 3.4 (3.2 to 3.6) percentage points, respectively. CONCLUSIONS: Synthesising information on exercise session attendance and compliance (exercise intensity) quantifies the intervention dose and informs evaluations of treatment fidelity. Public Library of Science 2015-04-22 /pmc/articles/PMC4406743/ /pubmed/25902066 http://dx.doi.org/10.1371/journal.pone.0125166 Text en © 2015 Taylor et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Taylor, Kathryn L.
Weston, Matthew
Batterham, Alan M.
Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
title Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
title_full Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
title_fullStr Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
title_full_unstemmed Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
title_short Evaluating Intervention Fidelity: An Example from a High-Intensity Interval Training Study
title_sort evaluating intervention fidelity: an example from a high-intensity interval training study
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4406743/
https://www.ncbi.nlm.nih.gov/pubmed/25902066
http://dx.doi.org/10.1371/journal.pone.0125166
work_keys_str_mv AT taylorkathrynl evaluatinginterventionfidelityanexamplefromahighintensityintervaltrainingstudy
AT westonmatthew evaluatinginterventionfidelityanexamplefromahighintensityintervaltrainingstudy
AT batterhamalanm evaluatinginterventionfidelityanexamplefromahighintensityintervaltrainingstudy