very interesting article on the physiological differences in muscle structure and how it relates to force-length curve of the brachioradialis
The isometric functional capacity of muscles that cross the elbow - PubMed
We hypothesized that muscles crossing the elbow have fundamental differences in their capacity for excursion, force generation, and moment generation due to differences in their architecture, moment arm, and the combination of their architecture and moment arm. Muscle fascicle length, sarcomere...
pubmed.ncbi.nlm.nih.gov