Bone Response to Exercise During Recovery Between Unloading Bouts in Adult Male Rats

2012 ◽  
Author(s):  
Y. Shirazi-Fard ◽  
E. Gonzalez ◽  
D. S. Morgan ◽  
J. M. Davis ◽  
K. L. Shimkus ◽  
...  
Keyword(s):  
Bone Mineral ◽  
Space Station ◽  
Male Rats ◽  
Volumetric Bone Mineral Density ◽  
Mineral Density ◽  
Mechanical Unloading ◽  
Exercise Regimen ◽  
Bone Properties ◽  
Bone Response ◽  
Response To Exercise

Mechanical unloading has deleterious effects on the musculoskeletal system, and exercise offers a way to reduce or reverse these effects. Studies of crew members from the International Space Station have documented bone losses that do not fully recover even years after returning to Earth [1,2], and this raises concerns with repeated missions. We have used the adult hindlimb unloaded (HU) rat model [3] to simulate repeated exposure to microgravity, and to study densitometric and mechanical properties at multiple bone sites. This study focuses on mixed bone sites including proximal tibia metaphysis (PTM), and femoral neck (FN) region which also has a significant clinical relevance. Surprisingly, losses for the 2nd HU were milder than those for the 1st HU for bone mineral content (BMC) and volumetric bone mineral density (vBMD), suggesting a possible protective effect of the 1st HU [4]. Comparison to a separate group exposed to a single period of HU initiated at the same age as the 2nd HU group ruled out age effects contributing to the smaller deficit. BMC and vBMD values returned to baseline but remained below aging cage control (CC) values, raising the question of whether the milder losses for the 2nd HU might be attributable, wholly or partially, to lower levels at the start of the 2nd HU. The goal of the current study was to determine if adding a resistance exercise regimen during recovery from the 1st HU would restore bone properties to CC levels and/or significantly affect the response to the 2nd HU.

scholarly journals Programming Effect of the Parental Obesity on the Skeletal System of Offspring at Weaning Day

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 424
Author(s):  
Radoslaw Piotr Radzki ◽  
Marek Bienko ◽  
Dariusz Wolski ◽  
Monika Ostapiuk ◽  
Pawel Polak ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Bone Mineral ◽  
High Energy ◽  
Diet Group ◽  
Male Rats ◽  
Bending Test ◽  
Male Rat ◽  
Skeletal System ◽  
Mineral Density ◽  
Trabecular Thickness

Our study aimed to verify the hypothesis of the existence of a programming effect of parental obesity on the growth, development and mineralization of the skeletal system in female and male rat offspring on the day of weaning. The study began with the induction of obesity in female and male rats of the parental generation, using a high-energy diet (group F). Females and males of the control group received the standard diet (group S). After 90 days of dietary-induced obesity, the diet in group F was changed into the standard. Rats from groups F and S were mated to obtain offspring which stayed with their mothers until 21 days of age. Tibia was tested using dual-energy X-ray absorptiometry (DXA), peripheral quantitative computed tomography (pQCT), micro-computed tomography (µCT) and mechanical strength using the three-point bending test. Biochemical analysis of blood serum bone metabolism markers was performed. DXA analysis showed higher tibia bone mineral content (BMC) and area. pQCT measurements of cortical and trabecular tissue documented the increase of the volumetric bone mineral density and BMC of both bone compartments in offspring from the F group, while µCT of the trabecular tissue showed an increase in trabecular thickness and a decrease of its separation. Parental obesity, hence, exerts a programming influence on the development of the skeletal system of the offspring on the day of the weaning, which was reflected in the intensification of mineralization and increased bone strength.

scholarly journals The Association of Lumbar Disc Herniation with Lumbar Volumetric Bone Mineral Density in a Cross-Sectional Chinese Study

Diagnostics ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 938
Author(s):  
Jian Geng ◽  
Ling Wang ◽  
Qing Li ◽  
Pengju Huang ◽  
Yandong Liu ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Lumbar Disc Herniation ◽  
Disc Herniation ◽  
Lumbar Disc ◽  
Magnetic Resonance Images ◽  
Volumetric Bone Mineral Density ◽  
Mineral Density ◽  
Men And Women ◽  
The Relationship

Little is known about the effect of lumbar intervertebral disc herniation (LDH) on lumbar bone mineral density (BMD), and few previous studies have used quantitative computed tomography (QCT) to assess whether the staging of LDH correlates with lumbar vertebral trabecular volumetric bone mineral density (Trab.vBMD). To explore the relationship between lumbar Trab.vBMD and LDH, seven hundred and fifty-four healthy participants aged 20–60 years were enrolled in the study from an ongoing study on the degeneration of the spine and knee between June 2014 and 2017. QCT was used to measure L2–4 Trab.vBMD and lumbar spine magnetic resonance images (MRI) were performed to assess the incidence of disc herniation. After 9 exclusions, a total of 322 men and 423 women remained. The men and women were divided into younger (age 20–39 years) and older (age 40–60 years) groups and further into those without LDH, with a single LDH segment, and with ≥2 segments. Covariance analysis was used to adjust for the effects of age, BMI, waistline, and hipline on the relationship between Trab.vBMD and LDH. Forty-one younger men (25.0%) and 59 older men (37.3%) had at least one LDH segment. Amongst the women, the numbers were 46 (22.5%) and 80 (36.4%), respectively. Although there were differences in the characteristics data between men and women, the difference in Trab.vBMD between those without LDH and those with single and ≥2 segments was not statistically significant (p > 0.05). These results remained not statistically significant after further adjusting for covariates (p > 0.05). No associations between lumbar disc herniation and vertebral trabecular volumetric bone mineral density were observed in either men or women.

Ischemic heart disease is associated with lower cortical volumetric bone mineral density of distal radius

2015 ◽  
Vol 26 (7) ◽  
pp. 1893-1901 ◽  
Author(s):  
J. Paccou ◽  
M. H. Edwards ◽  
K. A. Ward ◽  
K. A. Jameson ◽  
C. L. Moss ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Heart Disease ◽  
Ischemic Heart Disease ◽  
Distal Radius ◽  
Bone Mineral ◽  
Ischemic Heart ◽  
Volumetric Bone Mineral Density ◽  
Mineral Density

scholarly journals Volumetric bone mineral density at the spine and hip in Chinese American and White women

2011 ◽  
Vol 23 (10) ◽  
pp. 2499-2506 ◽  
Author(s):  
M. D. Walker ◽  
I. Saeed ◽  
D. J. McMahon ◽  
J. Udesky ◽  
G. Liu ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
White Women ◽  
Chinese American ◽  
Volumetric Bone Mineral Density ◽  
Mineral Density

scholarly journals Conditional disruption of IGF-I gene in type 1α collagen-expressing cells shows an essential role of IGF-I in skeletal anabolic response to loading

2011 ◽  
Vol 301 (6) ◽  
pp. E1191-E1197 ◽  
Author(s):  
Chandrasekhar Kesavan ◽  
Jon E. Wergedal ◽  
K.-H. William Lau ◽  
Subburaman Mohan
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Mechanical Strain ◽  
Bone Size ◽  
Size Difference ◽  
Mineral Density ◽  
Trabecular Thickness ◽  
Bone Response ◽  
Igf I ◽  
I Gene

To establish a causal role for locally produced IGF-I in the mechanical strain response in the bone, we have generated mice with conditional disruption of the insulin-like growth factor (IGF) I gene in type 1α2 collagen-expressing cells using the Cre-loxP approach. At 10 wk of age, loads adjusted to account for bone size difference were applied via four-point bending or axial loading (AL) in mice. Two wk of bending and AL produced significant increases in bone mineral density and bone size at the middiaphysis of wild-type (WT), but not knockout (KO), mice. In addition, AL produced an 8–25% increase in trabecular parameters (bone volume-tissue volume ratio, trabecular thickness, and trabecular bone mineral density) at the secondary spongiosa of WT, but not KO, mice. Histomorphometric analysis at the trabecular site revealed that AL increased osteoid width by 60% and decreased tartrate-resistance acidic phosphatase-labeled surface by 50% in the WT, but not KO, mice. Consistent with the in vivo data, blockade of IGF-I action with inhibitory IGF-binding protein (IGFBP4) in vitro completely abolished the fluid flow stress-induced MC3T3-E1 cell proliferation. One-way ANOVA revealed that expression levels of EFNB1, EFNB2, EFNA2, EphB2, and NR4a3 were different in the loaded bones of WT vs. KO mice and may, in part, be responsible for the increase in bone response to loading in the WT mice. In conclusion, IGF-I expressed in type 1 collagen-producing bone cells is critical for converting mechanical signal to anabolic signal in bone, and other growth factors cannot compensate for the loss of local IGF-I.

scholarly journals Differences in volumetric bone mineral density (vBMD) at the radius and tibia in premenopausal Caucasian and Asian women

Bone ◽  
2011 ◽  
Vol 48 ◽  
pp. S269-S270
Author(s):  
O. Hakim ◽  
A. Darling ◽  
K. Hart ◽  
J. Berry ◽  
S. Lanham-New
Keyword(s):  
Bone Mineral Density ◽  
Bone Mineral ◽  
Asian Women ◽  
Volumetric Bone Mineral Density ◽  
Mineral Density

scholarly journals Bone quality associated with daily intake of coffee: a biochemical, radiographic and histometric study

2010 ◽  
Vol 21 (3) ◽  
pp. 199-204 ◽  
Author(s):  
Suzie Aparecida Lacerda ◽  
Renata Inahara Matuoka ◽  
Rander Moreira Macedo ◽  
Sergio Olavo Petenusci ◽  
Alessandra Aparecida Campos ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Bone Quality ◽  
Bone Mineral ◽  
Bone Repair ◽  
Daily Intake ◽  
Male Rats ◽  
Lower Amount ◽  
Caffeine Intake ◽  
Mineral Density ◽  
Coffee Intake

Caffeine induces loss of calcium and influences the normal development of bone. This study investigated the effects of coffee on bone metabolism in rats by biochemical measurement of calcium, bone densitometry and histometry. Male rats, born of female treated daily with coffee and with coffee intake since born, were anesthetized, subjected to extraction of the upper right incisor, and sacrificed 7, 21 and 42 days after surgery. Blood and urine samples were taken, and their maxilla radiographed and processed to obtain 5-µm-thick semi-serial sections stained with hematoxylin and eosin. The volume and bone quality were estimated using an image-analysis software. The results showed significantly greater amount of calcium in the plasma (9.40 ± 1.73 versus 9.80 ± 2.05 mg%) and urine (1.00 ± 0.50 versus 1.25 ± 0.70 mg/24 h) and significantly less amount in bone (90.0 ± 1.94 versus 86.0 ± 2.12 mg/mg bone), reduced bone mineral density (1.05 ± 0.11 versus 0.65 ± 0.15 mmAL), and lower amount of bone (76.19 ± 1.6 versus 53.41 ± 2.1 %) (ANOVA; p≤0.01) in animals treated with coffee sacrificed after 42 days. It may be concluded that coffee/caffeine intake caused serious adverse effects on calcium metabolism in rats, including increased levels of calcium in the urine and plasma, decreased bone mineral density and lower volume of bone, thus delaying the bone repair process.

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