The isometric functional capacity of muscles that cross the elbow Export

@article{murray2000, abstract = {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 length, pennation angle, mass, and tendon displacement with elbow flexion were measured for the major elbow muscles in 10 upper extremity specimens. Optimal fascicle length, physiological cross-sectional area (PCSA), moment arm, operating range on the force-length curve, and moment-generating capacity were estimated from these data. Brachioradialis and pronator teres had the longest (17.7 cm) and shortest (5.5 cm) fascicles, respectively. Triceps brachii (combined heads) and brachioradialis had the greatest (14.9 cm2) and smallest (1.2 cm2) PCSAs, respectively. Despite a comparable fascicle length, long head of biceps brachii operates over a broader range of the force-length curve (length change=56\% of optimal length, 12.8 cm) than the long head of triceps brachii (length change=28\% of optimal length, 12.7 cm) because of its larger moment arm (4.7 cm vs. 2.3 cm). Although brachioradialis has a small PCSA, it has a relatively large moment-generating capacity (6.8 cm3) due to its large moment arm (average peak=7.7 cm). These results emphasize the need to consider the interplay of architecture and moment arm when evaluating the functional capabilities of a muscle.}, author = {Murray, Wendy M. and Buchanan, Thomas S. and Delp, Scott L.}, citeulike-article-id = {695145}, journal = {Journal of Biomechanics}, keywords = {anthropometry, elbow, muscle-model}, number = {8}, pages = {943--952}, posted-at = {2006-06-13 19:48:27}, priority = {2}, title = {The isometric functional capacity of muscles that cross the elbow}, volume = {33}, year = {2000} }

TY - JOUR ID - murray2000 L3 - citeulike-article-id:695145 N2 - 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 length, pennation angle, mass, and tendon displacement with elbow flexion were measured for the major elbow muscles in 10 upper extremity specimens. Optimal fascicle length, physiological cross-sectional area (PCSA), moment arm, operating range on the force-length curve, and moment-generating capacity were estimated from these data. Brachioradialis and pronator teres had the longest (17.7 cm) and shortest (5.5 cm) fascicles, respectively. Triceps brachii (combined heads) and brachioradialis had the greatest (14.9 cm2) and smallest (1.2 cm2) PCSAs, respectively. Despite a comparable fascicle length, long head of biceps brachii operates over a broader range of the force-length curve (length change=56% of optimal length, 12.8 cm) than the long head of triceps brachii (length change=28% of optimal length, 12.7 cm) because of its larger moment arm (4.7 cm vs. 2.3 cm). Although brachioradialis has a small PCSA, it has a relatively large moment-generating capacity (6.8 cm3) due to its large moment arm (average peak=7.7 cm). These results emphasize the need to consider the interplay of architecture and moment arm when evaluating the functional capabilities of a muscle. IS - 8 JF - Journal of Biomechanics EP - 952 TI - The isometric functional capacity of muscles that cross the elbow VL - 33 SP - 943 KW - anthropometry KW - elbow KW - muscle-model AU - Murray, Wendy AU - Buchanan, Thomas AU - Delp, Scott PY - 2000/// ER -