Measuring behavior change technique delivery and receipt in physical activity behavioral interventions

Research on physical activity behavioral support has mainly focused on measuring the absence or presence of behavior change techniques (BCTs) delivered by a counselor. We present a method to measure BCT delivery and receipt in physical activity behavioral support interventions.

The method was developed and tested using transcripts from behavior change counseling sessions delivered as part of a theory- and evidence-based physical activity intervention for adults with disabilities. Using existing methods, a new method was developed to code counselor and clients' verbal statements (BCTs and other statements). Two coders independently coded 30 transcripts of audio-recorded counseling sessions. Interrater reliability was assessed using percentage agreement and Prevalence Adjusted Bias Adjusted Kappa (PABAK).

Forty-eight codes were developed for counselor statements (35 BCT delivery and 13 other statements) and 46 codes for client statements (34 BCT receipt and 12 other statements). The average interrater reliability was considered nearly perfect for the counselor statements (84% agreement; PABAK = .98) and client statements (86% agreement; PABAK = .98). The BCT delivered and received were most frequently related to Goals and Planning (counselor:36%, client:35%), Support Strategies (counselor:21%, client:17%) and Self Belief (counselor:13%, client:24%).

This study presents a reliable coding method to measure BCT delivery and receipt in physical activity behavioral support interventions. The method can be used to enhance intervention fidelity assessment and study interactions between counselors and clients with and without disabilities. Measuring and evaluating BCT delivery and receipt can provide new insights into what types of behavioral support work best under which circumstances. (PsycInfo Database Record (c) 2022 APA, all rights reserved).