Clinical Signs: Lameness that is often intermittent, and may be unilateral or bilateral; thick, swollen stifles; pain on range - of - motion; crepitus; palpable luxation; inability to jump or walk normally; medial displacement of quadriceps muscle group; lateral bowing of the distal third of the femur. (workingdogs.com)
(G and H) Muscle fibers were automatically identified on H&E - stained sections of quadriceps femoris muscle of the 16 - month (G; young control, n = 786 muscle fibers from 5 mice; vehicle, n = 534 muscle fibers from 6 mice; rapamycin, n = 600 muscle fibers from 8 mice) and 25 - month (H; young control, n = 330 muscle fibers from 6 mice; vehicle, n = 741 muscle fibers from 4 mice; rapamycin, n = 1,371 muscle fibers from 5 mice) cohorts using image segmentation and analysis software. (jci.org)
Comparing Olympic weightlifters and untrained control subjects during an isokinetic machine deadlift test, Noe et al. (1992) found some differences in quadriceps muscle activity between the two groups. (strengthandconditioningresearch.com)