The moment
arm length displays a plateau between 120 — 100 degrees of shoulder flexion.
The moment
arm length displays a plateau region between 120 and 80 degrees measuring less than -5 mm.
Not exact matches
Software then looks at measurements keyed in by shoppers, such as height,
arm length and collar size, and
displays the mannequin photo set that best matches their body trying on clothes in sizes the user is interested in.
About 90 % of solid tumors
display whole - chromosome aneuploidy, while many tumors with diploid karyotypes nonetheless harbor segmental or
arm -
length aneuploidies that also result in significant gene copy number alterations.
Comparing the effect of squats with different stance widths, Escamilla et al. (2001a) reported no differences in hip moment
arm lengths between the narrow, medium, and wide stance width squats at any point in the lowering and lifting phases, except at 45 degrees of knee flexion in the lifting phase, when the medium and wide stance width squats
displayed greater hip moment
arm lengths than narrow stance width squats.
However, Ackland et al. (2011) explored the moment
arm lengths of the neck muscles and found that the upper and middle fibers of the trapezius
displayed its greatest force producing capacity during neck extension.
The calf muscles
display their longest moment
arm lengths at end - range plantar - flexion, and their smallest moment
arm lengths at end - range dorsiflexion.
This was associated with the more acute peak trunk angles
displayed by the inexperienced lifters, which was taken to imply a greater moment
arm length at the hip joint.
The minimum moment
arm length was
displayed at -15 degrees of dorsiflexion (toes pointing upwards).
Thus it appears that the peak moment
arm length is
displayed between 60 degrees of pronation and a neutral forearm position.
In contrast, Bremer reported that the peak moment
arm length was 60 degrees of pronation, while the minimum moment
arm length was
displayed at 80 degrees of supination.
Murray et al. (1995) found that the moment
arm of the biceps appears to peak (
length = 38 mm) at 90 degrees of elbow flexion, while its minimum (
length = 20 mm) is
displayed at 20 degrees of elbow flexion.
Ettema et al. (1998) found that the short head of the biceps
displays a peak moment
arm that ranged between 30.5 to 62.1 mm while the minimum moment
arm length was approximately 30.5 to 44.5 mm, based on the maximum and minimum values for 3 cadavers.
The peak moment
arm length appears to peak during mid-range pronation while its minimum moment
arm length is always
displayed during supination.
At 0 degrees of elbow flexion, with the elbow positioned to 0 degrees of flexion (straight
arm) the peak moment
arm is
displayed at approximately 45 degrees of pronation (
length = 5 mm), while the minimum moment
arm is
displayed at 60 to 80 degrees of supination (0 mm).
The short head of the biceps appears to
display a peak moment
arm (
length = 9 mm) at zero degrees of supination, while it's lowest moment
arm (
length = 5.75 mm) is
displayed at 60 degrees of supination.
Dostal et al. (1986) reported that the adductor magnus
displayed muscle moment
arm lengths of -0.3 cm (i.e. external rotation) and 0.4 cm (i.e. internal rotation) for the middle and posterior portions, respectively.
In other words, one head did not always
display a greater moment
arm length than the other (s) at any given joint angle.
However, the adductor magnus
displayed a much greater moment
arm length in 90 degrees of hip flexion than in full hip extension, which may indicate that this muscle has an important contributory role to hip extension moment in this position.
Ackland et al. (2008) showed that the inferior sternocostal head
displays a peak moment
arm length at 68 degrees (
length = -22.2 mm), and a minimum also at 120 degrees (
length = -12.4 mm).
The pectoralis major (clavicular head)
displays a peak moment
arm (
length = +30.2 mm) at 120 degrees (
arms over head) and its lowest moment
arm length of 2.5 degrees at +3.1 mm (Ackland et al., 2008).
In contrast, Murray et al. (2002) reported that the peak moment
arm length is
displayed at an angle of 44 degrees (slightly - bent
arm).
Ackland et al. (2008) showed that the pectoralis major (superior sternocostal head)
displayed a peak moment
arm length for shoulder adduction at 41 degrees (
length = +32.9 mm) and a minimum at 120 degrees (
length = -17.7 mm), while the pectoralis major (inferior sternocostal head)
displayed a peak at 64 degrees (
length = +33.6 mm) and a minimum also at 120 degrees (
length = -16.2.
Nevertheless, both parts of the sternocostal head
display similar moment
arm length to joint range of motion curves that appear as a bell - curve shape that peaks near the middle of shoulder abduction range of motion.
They found that successful lifts
displayed a greater reduction in moment
arm length (by 8 %) during the sticking region, while the moment
arm about the elbow during unsuccessful attempts did not change.
The hamstrings
displayed similar moment
arm lengths in 90 degrees of hip flexion and full hip extension.
Keuchle et al (1997) reported that the pectoralis major as a whole
displayed an average moment
arm length of 41.0 mm and a minimum moment
arm length of approximately 20.0 mm.
In support of this, Sugisaki et al. (2010) reported that the triceps
displayed a peak moment
arm (
length = 23.9 mm) at 30 degrees of elbow flexion and a minimum moment
arm (
length = 17.4 mm) at 110 degrees of elbow flexion.
Ackland et al. (2008) showed that the pectoralis major (clavicular head)
displayed a peak moment
arm length at 120 degrees of shoulder abduction (
length = +11.2 mm), and a minimum moment
arm length at 2.5 degrees of shoulder abduction (
length = -3.0 mm).
Keuchle et al. (2000) shows the peak moment
arm length is typically
displayed between 10 degrees of internal rotation (thumb facing up and inward) and 20 degrees of external rotation (thumbs facing up and outward).
As you can see from the chart below, the clavicular head of the pectoralis major
displays the largest shoulder flexion muscle moment
arm out of all parts of the pectoralis major, with a peak moment
arm length of 53.7 mm at 71 degrees of shoulder flexion (
arms just below parallel with the ground).
Ackland et al. (2008) showed that the pectoralis major (clavicular head)
displayed a peak moment
arm length of 30.2 mm at 120 degrees of shoulder flexion (
arms above head) and a minimum moment
arm length at 2.5 degrees (
length = +3.1 mm) of shoulder scapular plane flexion.
Ackland et al. (2008) reported the anterior and middle deltoid
display similarly large peak shoulder abduction moment
arm lengths (anterior = 30.2 mm; middle = 29.1 mm), while the posterior deltoid
displayed a peak shoulder adduction moment
arm length of -15.9 mm.
Between 80 degrees and 40 degrees the moment
arm length linearly increases and reaches a plateau around 30 degrees where its peak moment
arm length is
displayed.
In contrast, Ackland et al. (2008) reported the middle deltoid also
displayed a peak moment
arm length of only 12.2 mm at 120 degrees of shoulder flexion.
The anterior deltoid
displays a peak moment
arm (
length = 16.8 mm) at zero degrees of horizontal adduction (
arms to the side) and its lowest moment
arm (
length = zero) at 140 degrees of shoulder adduction (
arm across body).
The latissimus dorsi is a primary shoulder extensor in the sagittal plane and
displays its largest moment
arm lengths with the
arm below horizontal.
The superior region
displays peak moment
arm length with the
arms just below horizontal, while the middle and inferior regions
display peak moment
arm lengths with the
arms close to the sides.
As explained above, the inferior fibers of the latissimus dorsi muscle
display a peak moment
arm length of -10.8 mm at 53 degrees of shoulder flexion and a minimum moment
arm length of -2.9 mm at 120 degrees.
The middle deltoid
displays a peak moment
arm length of approximately 25.0 mm at 40 degrees of flexion, while the minimum moment
arm length approaches zero at 0 and 120 degrees of adduction (
arms to side and across body).
In contrast, Ackland et al. (2008) showed that the posterior deltoid
displayed a peak shoulder extension moment
arm length of -33.0 mm at 30 degrees of flexion (
arm pointing down), indicating that it likely acts as a primary shoulder extensor, second to the teres major while the
arm is close to the body.
The inferior fibers
displayed a peak moment
arm length of 38.1 mm at a shoulder flexion angle of 71 degrees, while the minimum moment
arm length was -3.3 mm at 10 degrees.
In the scapular plane, peak moment
arm lengths of the superior, middle and inferior regions are
displayed at 71, 10 and 10 degrees, respectively.
They reported that the moment
arm length linearly increases between 120 degrees and between 80 — 60 degrees, where a shorter plateau is
displayed, before a linear decrease in moment
arm length as the shoulder moves towards 0 degrees of shoulder abduction.
The posterior deltoid
displays a shoulder extension peak moment
arm length at 30 degrees (
length = -33.0 mm), while its lowest moment
arm length is
displayed at 120 degrees (
length = -16.3 mm).
Peak moment
arm lengths are
displayed just below the point where the
arms are horizontal in all regions.
While the anterior deltoid
displays a peak moment
arm length greater than the middle deltoid, Keuchle et al (1997) reported that the average moment
arm length to be 23.4 mm compared to 16.5 mm, indicating the greater contribution of the middle deltoid moment
arm length throughout the full range of motion.
Therefore, the superior fibers
display the largest moment
arm length of the latissimus dorsi, while the middle fibers
display the smallest.
The the superior and inferior fibers
display the largest peak moment
arm lengths, while the middle fibers
display the smallest.
They reported that the moment
arm length is unchanged between 90 — 55 degrees of shoulder abduction,
displaying a moment
arm length of approximately -38.0 to -40.0 mm.