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MICT or HIIT ± RT Programs for Altering Body Composition in Postmenopausal Women

Dupuit, Marine1; Rance, Mélanie2; Morel, Claire2; Bouillon, Patrice3; Pereira, Bruno4; Bonnet, Alban1; Maillard, Florie1; Duclos, Martine5,6,7,8; Boisseau, Nathalie1,6

doi: 10.1249/MSS.0000000000002162
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Purpose To compare body composition changes induced by moderate-intensity continuous training (MICT), high-intensity interval training (HIIT), or HIIT + resistance training (RT) programs (3 days/week, 12 weeks) in postmenopausal women with overweight/obesity, and to determine whether fat mass reduction is related to greater fat oxidation (FatOx).

Methods Participants (n=27) were randomized in three groups: MICT (40min at 55-60% of peak power output, PPO), HIIT (60 x 8s at 80-90% of peak heart rate, 12s active recovery), and HIIT + RT (HIIT + 8 whole-body exercises: 1 set of 8-12 repetitions). DXA was used to measure whole-body and abdominal/visceral fat mass (FM) and fat-free mass (FFM). FatOx was determined at rest, during a moderate-intensity exercise (40min at 50% of PPO), and for 20 minutes post-exercise, before and after training.

Results Overall, energy intake and physical activity levels did not vary from the beginning to the end of the intervention. Body weight and total FM decreased in all groups over time, but significant abdominal/visceral FM losses were observed only in HIIT and HIIT + RT groups. When expressed in percentage, total FM, FFM, and muscle mass were significantly modified only by HIIT + RT training. FatOx did not change at rest, but increased similarly in the three groups during and after exercise. Therefore, the HIIT-induced greater FM loss was not related to higher FatOx during or after exercise.

Conclusions MICT or HIIT ± RT could be proposed to non-dieting postmenopausal women with overweight/obesity to decrease weight and whole-body FM. The HIIT programs were more effective than MICT in reducing abdominal/visceral FM. RT addition did not potentiate this effect, but increased the percentage of muscle mass.

1Laboratory of metabolic adaptations during exercise in pathologic and physiologic conditions (AME2P), Université Clermont Auvergne, EA 3533, Clermont-Ferrand, France

2Center of Resources, Expertise and Performance in Sports (CREPS), Bellerive-sur-Allier, France

3Department of Cardiology, Vichy Hospital, Vichy, France

4Clermont-Ferrand University Hospital, Biostatistics Unit (DRCI), Clermont-Ferrand, France

5Department of Sport Medicine and Functional Explorations, Clermont-Ferrand University Hospital, G. Montpied Hospital, Clermont-Ferrand, France

6CRNH –Auvergne – Rhône-Alpes (CNRH-AURA), Clermont-Ferrand, France

7UFR Medicine, Université Clermont Auvergne, Clermont-Ferrand, France

8INRA, Human Nutrition Unit UMR1019, Clermont-Ferrand, France

Corresponding author: Professor Nathalie Boisseau (PhD). Laboratoire des Adaptations Métaboliques à l’Exercice en conditions Physiologiques et Pathologiques (AME2P), 3 rue de la Chebarde, 63171, Aubière Cedex, France. Email:nathalie.boisseau@uca.fr

The results of this study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation. The results of the present study do not constitute endorsement by the American College of Sports Medicine. The authors declare that they have no competing interests. The MATISSE Study was funded by the University of Clermont Auvergne (AME2P laboratory). The funders had no role in the study design, the collection, analysis, and interpretation of data, the writing of the manuscript, and the decision to submit the article for publication.

Accepted for Publication: 6 September 2019.

© 2019 American College of Sports Medicine