Sex- and age-related differences in femoral neck cross-sectional structural changes in mainland Chinese men and women measured using dual-energy X-ray absorptiometry

Bone ◽  
2016 ◽  
Vol 83 ◽  
pp. 58-64 ◽  
Author(s):  
Jian Gong ◽  
Min Tang ◽  
Bin Guo ◽  
JingJie Shang ◽  
Yongjin Tang ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Structural Changes ◽  
Dual Energy ◽  
Cross Sectional ◽  
Men And Women ◽  
Mainland Chinese ◽  
Chinese Men ◽  
X Ray ◽  
Age Related

Dual-energy X-ray absorptiometry at the lumbar spine in German men and women: A cross-sectional study

1995 ◽  
Vol 56 (5) ◽  
pp. 350-354 ◽  
Author(s):  
R. Lehmann ◽  
M. Wapniarz ◽  
O. Randerath ◽  
H. M. Kvasnicka ◽  
W. John ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Cross Sectional Study ◽  
Dual Energy ◽  
Sectional Study ◽  
Cross Sectional ◽  
Men And Women ◽  
X Ray

Associated Factors and Health Impact of Sarcopenia in Older Chinese Men and Women: A Cross-Sectional Study

Gerontology ◽  
2007 ◽  
Vol 53 (6) ◽  
pp. 404-410 ◽  
Author(s):  
Jenny S.W. Lee ◽  
Tung-Wai Auyeung ◽  
Timothy Kwok ◽  
Edith M.C. Lau ◽  
Ping-Chung Leung ◽  
...  
Keyword(s):  
Associated Factors ◽  
Health Impact ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Men And Women ◽  
Chinese Men ◽  
Older Chinese

Reliability and Agreement of Various InBody Body Composition Analyzers as Compared to Dual-Energy X-Ray Absorptiometry in Healthy Men and Women

2020 ◽  
Vol 23 (3) ◽  
pp. 443-450 ◽  
Author(s):  
Cherilyn N. McLester ◽  
Brett S. Nickerson ◽  
Brian M. Kliszczewicz ◽  
John R. McLester
Keyword(s):  
Body Composition ◽  
Dual Energy ◽  
Men And Women ◽  
Healthy Men ◽  
X Ray

Dual-energy X-ray absorptiometry lean soft tissue hydration: independent contributions of intra- and extracellular water

2004 ◽  
Vol 287 (5) ◽  
pp. E842-E847 ◽  
Author(s):  
Marie-Pierre St-Onge ◽  
ZiMian Wang ◽  
Mary Horlick ◽  
Jack Wang ◽  
Steven B. Heymsfield
Keyword(s):  
Soft Tissue ◽  
Water Distribution ◽  
Dual Energy ◽  
Healthy Adults ◽  
Intracellular Water ◽  
Whole Body ◽  
Extracellular Water ◽  
Cross Sectional ◽  
Total Group ◽  
X Ray

Dual-energy X-ray absorptiometry (DEXA) provides a measure of lean soft tissue (LST). LST hydration, often assumed to be constant, is relevant to several aspects of DEXA body composition estimates. The aims of this study were to develop a theoretical model of LST total body water (TBW) content and to examine hydration effects with empirically derived model coefficients and then to experimentally test the model's prediction that, in healthy adults, LST hydration is not constant but varies as a function of extra- and intracellular water distribution (E/I). The initial phase involved TBW/LST model development and application with empirically derived model coefficients. Model predictions were then tested in a cross-sectional study of 215 healthy adults. LST was measured by DEXA, extracellular water (ECW) by NaBr dilution, intracellular water (ICW) by whole body 40K counting, and TBW by 2H2O dilution. TBW estimates, calculated as ECW + ICW, were highly correlated with ( r = 0.97, SEE = 2.1 kg, P < 0.001) and showed no significant bias compared with TBW measured by 2H2O. Model-predicted TBW/LST was almost identical to experimentally derived values (means ± SD) in the total group (0.767 vs. 0.764 ± 0.028). LST hydration was significantly correlated with E/I (total group, r = 0.30, SEE = 0.027, P < 0.001). Although E/I increased with age (men, r = 0.48; women, r = 0.37; both P < 0.001), the association between TBW/LST and age was nonsignificant. Hydration of the DEXA-derived LST compartment is thus not constant but varies predictably with ECW and ICW distribution. This observation has implications for the accuracy of body fat measurements by DEXA and the use of TBW as a means of checking DEXA system calibration.

Changes in the Human Vocal Tract Due to Aging and the Acoustic Correlates of Speech Production

2003 ◽  
Vol 46 (3) ◽  
pp. 689-701 ◽  
Author(s):  
Steve An Xue ◽  
Grace Jianping Hao
Keyword(s):  
Speech Production ◽  
Vocal Tract ◽  
Cost Effective ◽  
The Elderly ◽  
Cross Sectional ◽  
Men And Women ◽  
Acoustic Reflection ◽  
Dimensional Changes ◽  
Formant Frequencies ◽  
Age Related

This investigation used a derivation of acoustic reflection (AR) technology to make cross-sectional measurements of changes due to aging in the oral and pharyngeal lumina of male and female speakers. The purpose of the study was to establish preliminary normative data for such changes and to obtain acoustic measurements of changes due to aging in the formant frequencies of selected spoken vowels and their long-term average spectra (LTAS) analysis. Thirty- eight young men and women and 38 elderly men and women were involved in the study. The oral and pharyngeal lumina of the participants were measured with AR technology, and their formant frequencies were analyzed using the Kay Elemetrics Computerized Speech Lab. The findings have delineated specific and similar patterns of aging changes in human vocal tract configurations in speakers of both genders. Namely, the oral cavity length and volume of elderly speakers increased significantly compared to their young cohorts. The total vocal tract volume of elderly speakers also showed a significant increment, whereas the total vocal tract length of elderly speakers did not differ significantly from their young cohorts. Elderly speakers of both genders also showed similar patterns of acoustic changes of speech production, that is, consistent lowering of formant frequencies (especially F1) across selected vowel productions. Although new research models are still needed to succinctly account for the speech acoustic changes of the elderly, especially for their specific patterns of human vocal tract dimensional changes, this study has innovatively applied the noninvasive and cost-effective AR technology to monitor age-related human oral and pharyngeal lumina changes that have direct consequences for speech production.

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