Similar to the Core Muscle Activation article we posted earlier, this research report demonstrates which exercises elicit the best muscle activation during therapeutic exercises. It also has good visual demonstrations of each exercise.
A few highlights:
-Sidelying Hip Abduction elicited the greatest Gluteus Medius activation, followed by Single Limb Squat and Lateral Band Walking.
-Single Limb Squat and Single Limb deadlift promoted the greatest Gluteus Maximus Activation.
-Notice the relatively low Glutues Medius Activation the Clamshell Exercise at 30 degrees and 60 degrees Hip Flexion despite being one of the most used Gluteus Medius strengthening exercises we have seen in the clinic. Looking at the graphs in the article, you can also find several other exercises that are much more functional than the clamshell.
Keep in mind how you would progress each of these ex
Because we all strive to be movement analysis specialists, a little gait mechanics review never hurts.
Each graph breaks down the ROM requirements, muscle, torque demand, and functional significance as described by Rancho Los Amigos.
All graphs courtesy of Saint Louis University student, class '12.
Here are a few of the many interesting points discussed in this article by Dr. Neumann in this 2010 Research Review:
-You must always include both cross-sectional area and moment arm length when assessing force and muscle action.
-The Psoas major acts as an important vertical stabilizer of the lumbar spine, especially in full hip extension, when the greatest passive tension is on the muscle.
-The posterior head of the adductor magnus is a primary extensor
-Co-activating the hip extensors and abdominals while passively stretching the hip flexors can provide an additional stretch on the hip flexors.
-Both the sartorius and long head of the biceps femoris act as secondary external rotators.
-Dynamic stability of the hip during high velocity rotation may be one of the primary functions of the short external rotators.
-The short external rotators provide acetabulofemoral articulation stability (similar to how the infraspinatus and teres minor provide stability at the glenohumeral joint)
-The Gluteus Max. is an important external rotator in closed chain kinematics (such as stopping and cutting).
-At 0 deg. of hip flexion, the Gluteus Max. Anterior fibers act as external rotators, BUT At 45 deg. of hip flexion, the Anterior fibers become internal rotators.
-The piriformis is an external rotator in full extension, but an internal rotator in hip flexion >90 degrees.
- Most adductors become hip extensors between 40 and 70 degrees of hip flexion (the exact degree is not known although research is being done on the topic.)
-The Gluteus Minimus tendon attaches to the Anterior and Superior Joint Capsule of the Hip Joint.
See Full Article Here
If you're a sports fan at any level, you are sure to be aware of a devastating hamstring strain and how limiting it can be. With some individuals, they never seem to fully recover or have a recurrence of the same injury just a few months later. While the hamstring being strained seems to be the common suspect, it is not always the source of the patient's symptoms.
This article takes a look at various injuries that present as hamstring strains and how to identify/treat them. An interesting finding in the article was the lack of support for hamstring stretching and strengthening for the acute hamstring strain. Better results (non-recurrence of injury) were found with core stabilization and agility training.
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