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Molecular Imaging and Biology
Published in: Molecular Imaging and Biology 2/2011

01-04-2011 | Research Article

The Effects of Aging on Testicular Volume and Glucose Metabolism: an Investigation with Ultrasonography and FDG-PET

Authors: Hua Yang, Timothy Chryssikos, Mohamed Houseni, Saad Alzeair, Maddalena Sansovini, Sireesha Iruvuri, Drew A. Torigian, Hongming Zhuang, Simin Dadparvar, Sandip Basu, Abass Alavi

Published in: Molecular Imaging and Biology | Issue 2/2011

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Abstract

Objectives

To investigate the effects of senescence on testicular volume and metabolism by quantitative analysis of volumetric and functional data provided by genital ultrasonography (US) and 2-deoxy-2-[18F]fluoro-D-glucose–positron emission tomography (FDG-PET), respectively.

Methods

Three hundred twenty (PET 173, US 147) male subjects (average age, 47.9 ± 24.1 years; range, 11–90 years) who previously underwent US or FDG-PET imaging were included in this retrospective study. Testicular volumes and FDG maximum standardized uptake values (SUVmax) were correlated with age using polynomial regression and Pearson linear regression analysis.

Results

With cross-sectional analysis, the best-fit curves demonstrated statistically significant overall correlations between changes in both the volume and metabolism (SUVmax) of the testicle and increasing age (volume: R 2 = 0.42, p = 0.0002; SUVmax: R 2 = 0.26, p < 0.0001). Testicular volume rapidly increases during puberty and peaks at age 30 years. Subsequently, the volume of the testes stabilizes in a plateau-like manner until age 60 years. After age 60 years, this study shows that testicular volume decreases significantly. Testicular glucose metabolism increases until age 40 years, after which it declines gradually over time at a constant rate.

Conclusion

Testicular volume and metabolism appear to be significantly affected by advancing age at different rates during the different stages of lifespan. The rapid increase in testicular volume and metabolism parallel the onset and progression of puberty and positively correlate with increasing age up to ages 30–40 years. Between ages 40 and 60 years, testicular volume and metabolism remain relatively constant with only a minimal decline. After age of 60 years, the testicular volume significantly declines, while testicular metabolism progressively declines until age 90 years.
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Metadata
Title
The Effects of Aging on Testicular Volume and Glucose Metabolism: an Investigation with Ultrasonography and FDG-PET
Authors
Hua Yang
Timothy Chryssikos
Mohamed Houseni
Saad Alzeair
Maddalena Sansovini
Sireesha Iruvuri
Drew A. Torigian
Hongming Zhuang
Simin Dadparvar
Sandip Basu
Abass Alavi
Publication date
01-04-2011
Publisher
Springer-Verlag
Published in
Molecular Imaging and Biology / Issue 2/2011
Print ISSN: 1536-1632
Electronic ISSN: 1860-2002
DOI
https://doi.org/10.1007/s11307-010-0341-x

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