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Evaluating intervention fidelity: an example from a high-intensity interval training study.

Kathryn L Taylor1, Matthew Weston2, Alan M Batterham1

  • 1Health and Social Care Institute, Teesside University, Middlesbrough, United Kingdom.

Plos One
|April 23, 2015
PubMed
Summary
This summary is machine-generated.

Quantifying intervention fidelity in high-intensity interval training (HIIT) is crucial. This study demonstrates a method using heart rate data to measure adherence to HIIT protocols, revealing variability in exercise intensity.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Intervention Research

Background:

  • Intervention fidelity, the extent to which an intervention is implemented as planned, is critical for research validity.
  • Quantifying intervention fidelity using simple, robust methods remains a challenge in experimental research.
  • High-intensity interval training (HIIT) interventions require precise monitoring to ensure participants achieve the intended exercise intensity.

Purpose of the Study:

  • To present a rigorous quantitative evaluation of intervention fidelity.
  • To utilize data from a high-intensity interval training intervention to demonstrate fidelity measurement.
  • To establish a framework for assessing the consistency of exercise intensity in HIIT studies.

Main Methods:

  • A single-group measurement study involving 17 adolescents (mean age 14.0 ± 0.3 years) undergoing a 10-week HIIT intervention.
  • Heart rate data collected at 5-s intervals to determine peak heart rate for each maximal effort repetition.
  • Calculation of the proportion of repetitions meeting the ≥90% maximal heart rate criterion, analyzed using linear mixed models for between- and within-subject variability.

Main Results:

  • Intention-to-treat analysis showed a median of 58% of repetitions met the high-intensity criterion (peak heart rate 85% of maximal).
  • Per-protocol analysis (n=8, 100% attendance) indicated a higher median of 68% of repetitions met the criterion (peak heart rate 91% of maximal).
  • Significant between- and within-subject variability in peak heart rate was observed, highlighting challenges in consistent high-intensity exercise delivery.

Conclusions:

  • Combining attendance and exercise intensity data provides a quantitative measure of the intervention dose.
  • This approach effectively quantifies intervention fidelity in HIIT interventions.
  • Accurate fidelity assessment is essential for interpreting intervention outcomes and informing future research.