title: Quick benefits of interval training versus continuous training on bone: a dual-energy X-ray absorptiometry comparative study.
abstract: To delay age-related bone loss, physical activity is recommended during growth. However, it is unknown whether interval training is more efficient than continuous training to increase bone mass both quickly and to a greater extent. The aim of this study was to compare the effects of a 10-week interval training regime with a 14-week continuous training regime on bone mineral density (BMD). Forty-four male Wistar rats (8 weeks old) were separated into four groups: control for 10 weeks (C10), control for 14 weeks (C14), moderate interval training for 10 weeks (IT) and moderate continuous training for 14 weeks (CT). Rats were exercised 1 h/day, 5 day/week. Body composition and BMD of the whole body and femur respectively were assessed by dual-energy X-ray absorptiometry at baseline and after training to determine raw gain and weight-normalized BMD gain. Both trained groups had lower weight and fat mass gain when compared to controls. Both trained groups gained more BMD compared to controls when normalized to body weight. Using a 30% shorter training period, the IT group showed more than 20% higher whole body and femur BMD gains compared to the CT. Our data suggest that moderate IT was able to produce faster bone adaptations than moderate CT.
authors.affiliation: Movement to Health - Euromov, UFR STAPS, Université de Montpellier 1, Montpellier, France.|UMR-S658 INSERM, Université d'Orléans, Orléans, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Boudenot
authors.affiliation: UMR-S658 INSERM, Université d'Orléans, Orléans, France.|Laboratory of Oral Biology, School of Dentistry, Kansas City, MO, USA.
authors.forename: Delphine B
authors.initials: DB
authors.lastname: Maurel
authors.affiliation: UMR-S658 INSERM, Université d'Orléans, Orléans, France.|UMR 7052 Laboratory for Osteoarticular Bioengineering and Bioimaging, CNRS, Univ Paris Diderot, Sorbonne Paris Cité, École nationale vétérinaire d'Alfort, Paris, France.|Université d'Orléans, Orléans, France.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Pallu
authors.affiliation: Epidémiologie et Biostatistique, Inserm CIC 802, CHU Poitiers, Université de Poitiers, Poitiers, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Ingrand
authors.affiliation: Laboratory of Metabolic Adaptations to Exercise under Physiological and Pathological Conditions, EA 3533, Clermont University, Blaise Pascal University BP 10448, Clermont-Ferrand, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Boisseau
authors.affiliation: UMR-S658 INSERM, Université d'Orléans, Orléans, France.|EA 3300, Adaptations Physiologiques à l'Exercice et Réadaptation à l'Effort, UFR des Sciences du Sport, Université de Picardie Jules Verne, 80025, Amiens, France.
authors.forename: Christelle
authors.initials: C
authors.lastname: Jaffré
authors.affiliation: UMR 7052 Laboratory for Osteoarticular Bioengineering and Bioimaging, CNRS, Univ Paris Diderot, Sorbonne Paris Cité, École nationale vétérinaire d'Alfort, Paris, France.|Université d'Orléans, Orléans, France.
authors.forename: Hugues
authors.initials: H
authors.lastname: Portier
mesh_terms: D015502:Absorptiometry, Photon; D000222:Adaptation, Physiological; D050154:Adiposity; D000818:Animals; D015519:Bone Density; D005269:Femur / Q000000981:diagnostic imaging*; D008297:Male; D010805:Physical Conditioning, Animal / Q000379:methods*; D005082:Physical Exertion; D017208:Rats, Wistar; D013997:Time Factors; D015430:Weight Gain
keywords: body composition; bone mineral density; exercise; rat; running