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

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.