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Intrinsic Motivation in Two Exercise Interventions: Associations With Fitness and Body Composition

Version 2 2024-06-06, 04:44
Version 1 2016-07-15, 08:43
journal contribution
posted on 2024-06-06, 04:44 authored by C Thøgersen-Ntoumani, SO Shepherd, N Ntoumanis, AJM Wagenmakers, Chris ShawChris Shaw
OBJECTIVE: To examine the motivational process through which increases in aerobic capacity and decreases in total body fat are achieved during high-intensity intermittent training (HIT) and moderate-intensity continuous training (MICT) interventions. METHOD: Eighty-seven physically inactive adults (65% women, age = 42 ± 12, BMI = 27.67 ± 4.99 kg/m²) took part in a 10-week randomized intervention testing group-based HIT, operationalized as repeated sprints of 15-60 s interspersed with periods of recovery cycling ≤ 25 min/session, 3 sessions/wk⁻¹, or MICT, operationalized as cycling at constant workload of ∼65% maximum aerobic capacity (VO₂max, 30-45 min/session⁻¹, 5 sessions/wk⁻¹. Assessments of VO₂max and total body fat were made pre- and postintervention. Motivation variables were assessed midintervention and class attendance was monitored throughout. Path analysis was employed, controlling for treatment arm and baseline values of VO₂max and total body fat. RESULTS: The 2 groups differed in adherence only, favoring HIT. Baseline VO₂max predicted intrinsic motivation midintervention. Intrinsic motivation predicted program adherence, which in turn predicted increases in VO2max and decreases in total body fat by the end of the study. CONCLUSION: Intrinsic motivation in HIT and MICT is positively linked to adherence to these programs, which can facilitate improvements in fitness and body composition.

History

Journal

Health Psychology

Volume

35

Pagination

195-198

Location

United States

ISSN

0278-6133

eISSN

1930-7810

Language

English

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2015, American Psychological Association

Issue

2

Publisher

AMER PSYCHOLOGICAL ASSOC