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High-impact exercise in rats prior to and during suspension can prevent bone loss. 2016

G R Yanagihara, and A G Paiva, and G A Gasparini, and A P Macedo, and P D Frighetto, and J B Volpon, and A C Shimano
Laboratório de Bioengenharia, Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.

High-impact exercise has been considered an important method for treating bone loss in osteopenic experimental models. In this study, we investigated the effects of osteopenia caused by inactivity in femora and tibiae of rats subjected to jump training using the rat tail suspension model. Eight-week-old female Wistar rats were divided into five groups (n=10 each group): jump training for 2 weeks before suspension and training during 3 weeks of suspension; jump training for 2 weeks before suspension; jump training only during suspension; suspension without any training; and a control group. The exercise protocol consisted of 20 jumps/day, 5 days/week, with a jump height of 40 cm. The bone mineral density of the femora and tibiae was measured by double energy X-ray absorptiometry and the same bones were evaluated by mechanical tests. Bone microarchitecture was evaluated by scanning electron microscopy. One-way ANOVA was used to compare groups. Significance was determined as P<0.05. Regarding bone mineral density, mechanical properties and bone microarchitecture, the beneficial effects were greater in the bones of animals subjected to pre-suspension training and subsequently to training during suspension, compared with the bones of animals subjected to pre-suspension training or to training during suspension. Our results indicate that a period of high impact exercise prior to tail suspension in rats can prevent the installation of osteopenia if there is also training during the tail suspension.

UI MeSH Term Description Entries
D010805 Physical Conditioning, Animal Diet modification and physical exercise to improve the ability of animals to perform physical activities. Animal Physical Conditioning,Animal Physical Conditionings,Conditioning, Animal Physical,Conditionings, Animal Physical,Physical Conditionings, Animal
D001851 Bone Diseases, Metabolic Diseases that affect the METABOLIC PROCESSES of BONE TISSUE. Low Bone Density,Low Bone Mineral Density,Osteopenia,Metabolic Bone Diseases,Bone Density, Low,Bone Disease, Metabolic,Low Bone Densities,Metabolic Bone Disease,Osteopenias
D005260 Female Females
D005269 Femur The longest and largest bone of the skeleton, it is situated between the hip and the knee. Trochanter,Greater Trochanter,Lesser Trochanter,Femurs,Greater Trochanters,Lesser Trochanters,Trochanter, Greater,Trochanter, Lesser,Trochanters,Trochanters, Greater,Trochanters, Lesser
D000071556 Cancellous Bone A type of osseous tissue which makes up the inner part of bone. It has a spongy, honeycomb-like structure with struts or trabecula and contains the BONE MARROW. It has higher rate of BONE REMODELING turnover than CORTICAL BONE. Spongy Bone,Trabecular Bone,Bone, Cancellous,Bone, Spongy,Bone, Trabecular,Bones, Cancellous,Bones, Spongy,Bones, Trabecular,Cancellous Bones,Spongy Bones,Trabecular Bones
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001696 Biomechanical Phenomena The properties, processes, and behavior of biological systems under the action of mechanical forces. Biomechanics,Kinematics,Biomechanic Phenomena,Mechanobiological Phenomena,Biomechanic,Biomechanic Phenomenas,Phenomena, Biomechanic,Phenomena, Biomechanical,Phenomena, Mechanobiological,Phenomenas, Biomechanic
D013977 Tibia The second longest bone of the skeleton. It is located on the medial side of the lower leg, articulating with the FIBULA laterally, the TALUS distally, and the FEMUR proximally. Tibias
D015519 Bone Density The amount of mineral per square centimeter of BONE. This is the definition used in clinical practice. Actual bone density would be expressed in grams per milliliter. It is most frequently measured by X-RAY ABSORPTIOMETRY or TOMOGRAPHY, X RAY COMPUTED. Bone density is an important predictor for OSTEOPOROSIS. Bone Mineral Content,Bone Mineral Density,Bone Densities,Bone Mineral Contents,Bone Mineral Densities,Density, Bone,Density, Bone Mineral
D017208 Rats, Wistar A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain. Wistar Rat,Rat, Wistar,Wistar Rats

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