1In a study on 46 subjects, individuals using a core ingredient in Six Star ® Joint & Muscle Recovery in combination with a training protocol significantly increased their range of motion on
knee extensions compared to subjects using a placebo (81 vs. 74 degrees).
In a study on 46 subjects, individuals using UC - II ® in combination with a training protocol significantly increased their range of motion on
knee extensions compared to subjects using a placebo (81 vs 74 degrees).
Not exact matches
When
compared to a traditional squat, the
knee extension machine can place even more stress on the patellar tendon,
knee ligaments (ACL), and cartilage behind the patella.
However, Funato et al. (2008)
compared the isokinetic concentric and eccentric
knee extension and flexion torques between elite senior and college Olympic weightlifters.
Comparing different squat variations, Swinton et al. (2012) reported that peak
knee extension moment arm lengths were greatest in the order box > traditional > powerlifting squat variations.
In agreement, Reid et al. (2011)
compared eccentric plantar flexion with the
knee fully extended and during a flexed position and reported superior gastrocnemius muscle activity during plantar flexion with full
knee extension and no difference in soleus muscle activity.
Comparing the back squat with
knee extensions, Signorile et al. (1994) found that muscle activity was greater during back squats than during
knee extensions but Andersen et al. (2006) found the opposite results and Escamilla et al. (1998) found that muscle activity differences depended upon
knee 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.
Yamashita (1988)
compared hamstrings EMG amplitude during isolated hip
extension and isolated
knee extension movements performed with 20 % of the MVIC moment to hamstrings EMG amplitude with a combined hip and
knee extension movement using the same hip and
knee extension moments.
Compare the bench press (shoulders and elbow joints) versus the dumbbell fly (elbows only), or the squat (ankles,
knees, hips) versus the leg
extension (
knees only).
Bryanton et al. (2011) found that as relative load increased from 50 % of 1RM to 90 % of 1RM, the ratio of net hip
extension moment to net
knee extension moment increased from 1.1 times to 1.5 times, while Flanagan & Salem (2007) also observed a greater increase in net hip
extension compared to net
knee extension moment, with increasing load.
Training to increase the strength and size of the gluteus maximus may be better performed with movements that limit
knee extension (e.g. hip thrusts and back
extensions)
compared to with movements that involve substantial
knee extension (squats and step ups).
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.
This seat has significantly reduced leg room due to the angle of the row
compared to the row in front and the presence of an
extension of the arm - rest from the row in front, which protrudes at
knee level into the seating area.