Capillary differences with age and fiber type are attenuated by accounting for fiber shape

This dataset contains quantitative measurements of skeletal muscle fiber morphology and capillarization in young and older women. Muscle biopsies were obtained from both a rested leg and a leg that had performed a single bout of heavy resistance exercise five days prior to sampling. Variables include muscle fiber cross-sectional area, perimeter, and Shape Factor Index (SFI), as well as multiple indices of capillarization, including capillary density, capillary-to-fiber ratio, individual capillary-to-fiber ratio, and morphology-adjusted capillarization metrics. The dataset enables analysis of age-, fiber type-, and condition-related differences in muscle fiber geometry and capillary supply.