Accuracy of lateral dual energy X-ray absorptiometry for the determination of bone mineral content in the thoracic and lumbar spine: anin vitrostudy

1993 ◽  
Vol 66 (784) ◽  
pp. 309-313 ◽  
Author(s):  
Stephen J Edmondston ◽  
Kevin P Singer ◽  
Roger I Price ◽  
Peter D Breidahl
1990 ◽  
Vol 70 (5) ◽  
pp. 1330-1333 ◽  
Author(s):  
CATHERINE GLASTRE ◽  
PIERRE BRAILLON ◽  
LOUIS DAVID ◽  
PIERRE COCHAT ◽  
PIERRE J. MEUNIER ◽  
...  

1992 ◽  
Vol 81 (12) ◽  
pp. 953-958 ◽  
Author(s):  
Bernard L Salle ◽  
Pierre Braillon ◽  
Francis H Glorieux ◽  
Jacques Brunet ◽  
Eduardo Cavero ◽  
...  

2019 ◽  
Vol 316 (1) ◽  
pp. R59-R67
Author(s):  
Tamara Hew-Butler ◽  
Kailyn Angelakos ◽  
Joshua Szczepanski

The purpose of this study was to assess relationships between plasma sodium concentration ([Na+]) and bone mineral content (BMC) after an acute sodium load plus treadmill walking and then quantify the amount of sodium the dual energy X-ray absorptiometry (DXA) scan could detect. The primary study was a single-blind randomized control crossover trial under two conditions: ingestion of six flour tablets (placebo trial) or six 1-g NaCl tablets (salt intervention trial). The tablets were ingested after baseline blood and urine collection followed immediately by the DXA scan. After 60 min of rest, a 45-min treadmill walk was conducted. Immediately postexercise, blood and urine were collected and the DXA scan was repeated. Main outcomes included changes (∆: post minus pre) in plasma [Na+] and BMC. Additionally, six 1-g NaCl tablets were superimposed over a DXA spine phantom for separate quantification of sodium as BMC. Fourteen subjects completed the primary study. Two-way repeated measures ANOVA tests revealed significant interaction ( F = 13.06; P = 0.0007), condition ( F = 21.88; P < 0.001), and time ( F = 6.51; P = 0.014) effects in plasma [Na+]. A significant condition ( F = 6.46; P = 0.014) effect was also noted in urine [Na+]. Total body BMC∆ was negatively correlated with plasma [Na+]∆ ( r = −0.43; P = 0.02) and urine [Na+]∆ ( r = −0.47; P = 0.01). Total body BMC∆ in the salt intervention trial [−5.5 (27) g] closely approximated the amount of NaCl ingested and subsequently absorbed into the bloodstream. The DXA scan quantified 67% of NaCl tablets as BMC in spine phantom analyses. Total body BMC∆ was negatively related to plasma and urine [Na+]∆ after treadmill walking. Reductions in total body BMC closely approximated the amount of NaCl ingested (~6 g). The DXA scan quantified NaCl as BMC.


1993 ◽  
Vol 26 (11) ◽  
pp. 1691-1696
Author(s):  
Yoshio Nomura ◽  
Hiroaki Mizoguchi ◽  
Masayuki Nakagawa ◽  
Nobuyoshi Nasu ◽  
Tsutomu Nishida ◽  
...  

2009 ◽  
Vol 11 (2) ◽  
pp. 275-285 ◽  
Author(s):  
Christina D. Economos ◽  
Miriam E. Nelson ◽  
Maria A. Fiatarone ◽  
Gerard E. Dallal ◽  
Steven B. Heymsfield ◽  
...  

2008 ◽  
Vol 104 (4) ◽  
pp. 1116-1120 ◽  
Author(s):  
Yoshihisa Umemura ◽  
Seigo Nagasawa ◽  
Naota Sogo ◽  
Akiko Honda

We investigated whether the effects of jump training on bone are preserved after a detraining period in female normal and estrogen-deficient rats. Forty-four 11-wk-old Wistar rats were divided into the following four groups: sham sedentary ( n = 12), sham exercised ( n = 11), ovariectomized sedentary ( n = 10), and ovariectomized exercised ( n = 11). An 8-wk exercise period was introduced in which the rats in the exercised groups were jumped 10 times/day, 5 days/wk. This was followed by 24 wk of detraining. At the end of the exercise period, the jump training significantly increased the bone mineral content of the tibia ( P < 0.001), measured by dual-energy X-ray absorptiometry. After the detraining period, the bone mineral content ( P < 0.01), strength ( P < 0.001), and cross-sectional widths ( P < 0.001) of the tibia in the exercised groups were still greater than in the sedentary groups, without significant surgery-exercise interactions, although bone stiffness in the fracture test ( P < 0.05) and bone area in the center-proximal region, as measured by dual-energy X-ray absorptiometry ( P < 0.05), showed significant surgery-exercise interactions. These findings suggest that the exercise effect on bone strength is preserved, accompanied by cross-sectional morphological changes, even under estrogen deficiency.


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