Sentences with phrase «flexion angle»

Németh & Ohlsén (1984) performed a study of 10 cadavers and 20 live subjects, and reported that the hip extension moment arm length of the gluteus maximus moment arm of gluteus maximus decreased substantially from around 8 cm to 3 cm with increasing hip flexion angle, making the gluteus maximus far more effective as a hip extensor in full hip extension, than in full hip flexion.

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.

This study explored how both upper and lower gluteus maximus activation are affected by hip flexion angle when performing hip abduction.

During hip abduction, a greater hip flexion angle seems to lead to greater gluteus maximus EMG amplitude.

Grip width affects the shoulder angle during the sticking region in the bench press, where shoulder abduction angle is more acute and flexion angle is greater at the start of the sticking region using a narrow grip compared to medium and wide grip widths.

Similarly, Fujisawa et al. (2014) found that hip flexion angle did not affect gluteus medius muscle activity when the knee was in full extension during isometric hip abduction.

Thus, changes in the internal moment arm lengths of the gluteus maximus and hamstrings do not appear to explain the greater hip extension moment in greater degrees of hip flexion angle.

Thus, neither the ability of the gluteus maximus nor hamstrings to produce muscular force appears to explain the relationship between the hip extension moment and hip flexion angle.

Although many different biomechanical factors increased with jump training, it was the increase in hip flexion angle (which leads to a longer countermovement phase, a longer duration concentric phase, and more concentric work done) and an increase in hip joint work done that were most important for driving the gains in jump height, at least on a joint level.

The moment arm lengths of the three primary hip extensors change with changing hip flexion angle.

However, noting the significant gain in hip extension in the intervention group from prelunge to postlunge in the second session and comparing them to the results reported by Macdonald et al. (6) of immediate gains in knee flexion angle post foam rolling, it is reasonable to conclude that the effects of foam rolling are immediate, even in a dynamic movement, but do not remain for longer bouts of time.

For example, Lunnen et al. (1981) studied a much greater hip flexion angle (135 degrees) than many of the other researchers (e.g. Mohamed et al. 2002; Guex et al. 2012) and it is possible that the large stretch in this position moved the muscle up the passive arm of the length - tension curve, thereby reducing neural drive.

Hamstrings activity does not appear to alter markedly with changing hip flexion angle (Worrell et al. 2001; Mohammed et al. 2002; Guex et al. 2012).

This hip flexion angle is accompanied by a change in the trunk angle.

As ankle plantar - flexion angle increased from -15 to 15 degrees, the moment arm length increased linearly.

Exploring the effect of knee flexion angle, Cresswell et al. (1995) assessed the gastrocnemius and soleus muscle activity during isometric plantarflexion with varying degrees of knee flexion ranging between a fully extended and 130 degrees (flexed) position.

They report that with increasing knee flexion angle gastrocnemius muscle activity decreased and soleus muscle activity remained unchanged.

Computer - based estimation of the hip joint reaction force and hip flexion angle in three different sitting configurations.

Comparing differences between legs during the back squat, Flanagan and Salem (2007) found that peak knee flexion angles displayed bilateral differences, with the right side achieving a more acute angle than the left side.

Comparing the effects of squats with different stance widths, Escamilla et al. (2001a) did not report actual peak ankle plantar flexion angles, but they did report more heavily - angled shanks in narrow stance squats compared to wide stance squats.

Peak knee flexion angles are less acute when using cues to prevent forward knee movement over the toes or as a result of fatigue.

Similarly, Sato et al. (2013) also found that running shoes displayed greater peak knee flexion angles than no footwear.

Increasing load and wearing running shoes rather than no footwear appear to lead to more acute peak knee flexion angles.

Sinclair et al. (2014) compared the use of weightlifting shoes, minimalist footwear, running shoes, and no footwear (barefoot) and found that running shoes displayed greater peak knee flexion angles than no footwear but there were no other differences between conditions.

In practical terms, both upper and middle trapezius display high muscle activity at knee flexion angles of 31 — 60 degrees.

This is likely due to the vertical displacement of the bar at the start of the sticking point and resulting shoulder abduction and elbow flexion angles, and therefore, the sticking region of unsuccessful attempts starts earlier in the ascending phase compared with successful lifts.

Similarly, Ninos et al. (1997) found no changes in EMG amplitude with knee flexion angles during the squat, while changes in quadriceps EMG amplitude were noted.

The bench press grip width appears to affect peak shoulder abduction and horizontal flexion angles that correspond to key regions in the bench press, such as the sticking region.

However, it is noteworthy that Pressel and Lengsfeld (1998) found that the hip flexion action of the adductor longus muscle was limited to hip flexion angles of up to 90 degrees only.

In the lowering phase, external oblique muscle activity was greatest at knee flexion angles of 60 — 31.

Knee flexion angles range between 25 — 35 degrees from full knee extension.

They imported this data into a three - dimensional musculoskeletal model of the hip muscles in order to assess the effects of changing hip flexion on the ability of the gluteus maximus to perform different movements at different hip flexion angles.

Delp et al. (1999) measured the muscle moment arms of 6 different compartments of the gluteus maximus at several different hip flexion angles (0, 20, 45, 60, and 90 degrees) in 4 cadavers.

Not exact matches

The muscles are responsible for dorsi - flexion (pulling the foot upward), plantar flexion (pushing the foot downward), eversion (turning the foot outward), inversion (turning the foot inward), and combined angle movements.

They're called hip flexors because they create flexion in the hip, which is the technical term for a bending movement around a joint in a limb (such as the knee or elbow) that decreases the angle between the bones of the limb at the joint.

Note that while sitting in spinal flexion (image on the far right) your torso angle is the smallest

During ankle plantar - flexion, relative load, knee joint angle, ankle joint angle and repetition speed all appear to affect both gastrocnemius and soleus muscle activity.

When assessing maximal knee angle (flexion), mean power output in the concentric phase a squat exercise, and vastus lateralis EMG amplitude, the test - re-test reliability measured by the coefficient of variation (COV) ranged between 5.3 — 7.8 %, which suggests that these measurements are comparatively consistent but not perfectly replicable.

They're called hip flexors because they create flexion in the hip, which is the technical term for a bending movement around a joint in a limb that decreases the angle between the bones of the limb at the joint (such as the knee or elbow).

It is suggested that this works due to the ability of the exercise to increase the peak eccentric force of the hamstrings at shallower angles of knee flexion (the knee is more extended) vs. a leg curl which puts a premium on concentric force when the knee is in full flexion.

The neck press I feel builds mostly the mid upper outer area, now if you are trying to build, isolate the upper inner portion to me what works better is using the football bar, turning it upside down and doing a reverse angled grip 30 degree incline press, which is more shoulder flexion.

When sprinting, one the initial early acceleration phase has been completed, the joint angles of the hip and knee during the ground contact phase range from 30 degrees of flexion through to full extension.

In addition, sharper COD maneuvers involve less flexed knee angles at initial ground contact, but ultimately greater peak knee flexion (Havens & Sigward, 2015c).

Andersen et al. (2015) reported joint angle - specific gains in strength, whereby squats with free weights produced gains in isometric strength at both 60 and 90 degrees of knee flexion, while squats against elastic bands produced gains in isometric strength only at 60 degrees of knee flexion.

Landin & Thompson (2010) investigated the effect of elbow flexion and shoulder extension joint angle on the peak moment of the long head of the triceps.

In contrast, in the descending phase, both upper and lower erector spinae muscle activity grew higher as the knee angle increased from the top portion of the lift (0 — 30 degrees knee flexion) to the bottom portion (61 — 90 degrees knee flexion).

They tested joint angles from long (90 degrees of knee flexion) to short (30 degrees of knee flexion) muscle lengths, expecting to see greater gains for the isotonic group at both ends of the range of motion, where loading was higher than in the middle.

Moreover, Jakobsen et al. (2013) reported that during lunges with both free weights and elastic resistance, EMG amplitude of most of the leg muscles is greatest at the point of peak hip and knee flexion, where ground reaction forces are exerted in order to start the lifting phase but that in the elastic resistance condition, there was a trend towards a more even level of EMG amplitude across joint angles.

This study tested muscle activation during maximum voluntary contractions of hip extension, in different hip flexion joint angles while the knee was flexed, and found that gluteus maximus EMG amplitude was reduced by a third when the hip was flexed, compared to when it was fully extended.