While the moment arm length appears to change relative to the elbow joint angle,
the overall moment arm lengths regardless of angle joint angle appear to be correlated with the muscle cross-sectional area of the triceps and the dimensions of the bony attachment site of the olecranon (Sugisaki et al. 2010).
Murray et al. (1995) found that
the overall moment arm length of the biceps varied between its maximum and minimal by 40 % for men and 52 % for females.
Not exact matches
Overall, the peak
moment arm length of the calf muscle group is around 52.0 mm.
The
overall peak
moment arm length seems to be 47 mm, while the average
moment arm length appears to equal 37 mm (Murray et al. 2000).
The
moment arm lengths of the pectoralis major change considerably depending on (1) where in the
overall joint range of motion they are measured, and (2) which part of the muscle is measured (upper, middle, or lower).
Although
overall the pectoralis major may have a small shoulder flexion
moment arm, this obscures the fact that the different heads have very different
moment arm lengths.
In contrast, the pectoralis major
overall has a small extension
moment arm length, making it a weak contributor to movement in the opposite direction, along with the latissimus dorsi.
The
overall average
moment arm lengths of the deltoids appear to range between -16.8 mm to 24.6 mm depending on the segment of the deltoids and the range of motion measured (Keuchle et al. 1997).
The peak
moment arm length of the latissimus dorsi muscle
overall ranges between -21.1 to -45.0 mm depending on what region of the muscle is being measured and the joint angle.