ArticleSkeletal radiology2026
Quantitative MRI of core muscles at different activity levels: muscle-specific metrics and composite core fat fraction and lean-volume scores.
Article in Skeletal radiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectivesTo combine Dixon-based quantitative MRI with automated segmentation to quantify fat fraction (FF) and lean normalised muscle volume (LNV) in seven core muscles and to derive two composite scores, comparing highly active cyclists with a physically inactive group.
methodsCyclists (n = 84) and physically inactive volunteers (n = 85) underwent Dixon MRI of the lumbar spine and pelvis capturing images of the psoas major, iliacus, quadratus lumborum, erector spinae/multifidus, gluteus maximus, gluteus medius and gluteus minimus. Images were analysed using automated segmentation to determine the FF and LNV of each muscle and two composite core scores summarising mean fat fraction (FF
resultsCyclists showed lower FF and higher LNV than physically inactive participants across muscles and for both composite scores. Age was a significant predictor of FF in all muscles and in FF
conclusionsWe identified muscle-specific differences in core composition between highly active cyclists and physically inactive adults, and FF
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