Abstract
Object
The object was to assess whether cross-sectional area (CSA) and water diffusion properties of leg muscles in young and older women change with increased time spent in supine rest.
Materials and methods
Healthy young (n = 9, aged 20–30 years) and older (n = 9, aged 65–75 years) women underwent MRI scanning of the right leg at baseline, 30 and 60 min of supine rest. Muscle CSA was derived from proton density images. Water diffusion properties [apparent diffusion coefficient (ADC) and fractional anisotropy (FA)] of the tibialis anterior and posterior, soleus, and medial and lateral heads of the gastrocnemius were derived from diffusion tensor imaging (DTI). Repeated measures ANOVAs and Bonferroni post hoc tests determined the effects of time and group on each muscle outcome.
Results
In both groups, muscle CSA and FA did not significantly change over time, whereas ADC significantly decreased. A greater decline at 30 min for young women was only observed for ADC in the medial gastrocnemius.
Conclusion
Regardless of age, ADC values decreased with fluid shift associated with time spent supine, whereas CSA and FA were not affected. For leg muscle assessment in young and older women, DTI scanning protocols should consider the amount of time spent in a recumbent position.
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Acknowledgments
The study was funded in part by a grant from The Arthritis Society. The authors thank Norm Konyer and the MRI technologists (Janet Burr, Cheryl Contant and Julie Lecomte) for their assistance throughout data collection. AL is funded in part by the Ontario Women’s Health Scholar Award and the Joint Motion Program, a Canadian Institutes of Health Research Training Program in Musculoskeletal Health Research and Leadership.
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I certify that there is no actual or potential conflict of interest in relation to this article.
Ethical standard
This study was approved by our institutional research ethics board. Informed consent was provided by all participants.
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Lorbergs, A.L., Noseworthy, M.D. & MacIntyre, N.J. Age-related differences in the response of leg muscle cross-sectional area and water diffusivity measures to a period of supine rest. Magn Reson Mater Phy 28, 279–290 (2015). https://doi.org/10.1007/s10334-014-0464-1
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DOI: https://doi.org/10.1007/s10334-014-0464-1