Share   Subscribe to RSS feed

Brian Schiff’s Blog

Injury Prevention, Sports Rehab & Performance Training Expert

Tag: hip exercise

I have been a bit behind on blogging as of late.  I try to aim for one per week, but I also strive to deliver sound and relevant content.  Additionally, I do not seek outside contributors so finding time to write can be tricky with work and family life too.  So, forgive me for any apparent inconsistency in posting.  Just know that I will always try to provide valuable content.  Today’s post centers around an article in the July 2012 edition of AJSM.

sample_cover

My work at the Athletic Performance Center has provided me an increased opportunity to work with FAI and athletic hip injuries.  This is an area of evolution and growth in our field, so I find it particularly interesting to see rationale and thought processes centering around the timing, contribution and selection of hip exercises for active patients/athletes.

This article comes from the Steadman Philippon Research Institute in Vail, CO.  The purpose of the study was to measure the highest activation of the piriformis and pectineus muscle during various exercises.  The hypothesis was that highest pectineus activation would occur with hip flexion and moderate activity with internal rotation, whereas the highest activation with the piriformis would be with external rotation and/or abduction.

anterior_hip_muscles250px-posterior_hip_muscles_1

Methods: 10 healthy volunteers completed the following 13 exercises:

  1. Standing stool hip rotation
  2. Supine double leg bridge
  3. Supine single leg bridge
  4. Supine hip flexion
  5. Side-lying hip ABD with external rotation
  6. Side-lying hip ABD with internal rotation
  7. Side-lying hip ABD against a wall
  8. Hip clam exercise with hips in 45 degrees of flexion
  9. Hip clam exercise with hips in neutral
  10. Prone heel squeeze
  11. Prone resisted terminal knee extension
  12. Prone resisted knee flexion
  13. Prone resisted hip extension

All of these exercises have been reported to be used in hip rehab following arthroscopy or recovery from injury.  The exercises were executed slowly and methodically with a metronome to reduce EMG amplitude variations.


Continue reading…

There seems to be consistent questions, debate and studies done with respect to stretching.  As the thought of more closely analyzing the quality of movement (FMS, Y-Balance testing, SFMA for example) moves to the forefront in the PT and fitness world, many search for the right mix of exercise to maximize mobility.

I count myself as a supporter and follower of the work of Gray Cook and Stuart McGill.  While I may not agree 100% with all of their ideas, I generally consider them to be brilliant minds and ahead of the curve.  I have been using the FMS in my practice for some time now and have also begun to incorporate Y-Balance testing as well (see pic below courtesy of the IJSPT)

le-y-balance-test

The Y-Balance test may not have significant relevance to hip mobility as much as it does limb symmetry, but I included it here to illustrate my point in observing kinetic chain movement to help determine where the weak link or faulty movement pattern may be.  It gives us valuable information with respect to strength, balance and mobility.

With the revelation that FAI is more prevalent than we knew (click here for my post on FAI), I am always interested in hip mobility and how to increase movement in the hip joint.  Limitations in hip mobility can spell serious trouble for the lumbosacral region as well as the knee.

I currently use foam rolling, manual techniques, dynamic warm-up maneuvers, bodyweight single leg and hip/core disassociation exercises and static stretching to increase hip mobility.  However, I am often faced with the question of what works best?  Is less more?  How can I make the greatest change without adding extra work and unnecessary steps?

Well, Stuart McGill and Janice Moreside just published a study in the May 2012 Journal of Strength & Conditioning Research that sought to examine three different interventions and how they improve hip joint range of motion.  Previous work has been focused on the hip joint alone, and they wanted to see how other interventions impacted the mobility of the hip.  Click here for the abstract


Continue reading…

It is widely accepted that decreased hip strength and stability leads to knee valgus. Excessive frontal plane motion and valgus torque increase the risk for non-contact ACL injuries. While we know that hip abductor weakness is more of an issue in females than males, the question remains to what degree other factors are involved.

knee-valgus-add-ir

Claiborne et al (1) noted that only 22% of knee variability could be linked solely to hip muscles surrounding the hip. In light of this we must look at the whole kinetic chain when assessing movement dysfunction and injury risk. In the most recent issue of the IJSPT, researchers sought to discover how activating the core during a single leg squat would impact the kinematics of 14 female college-age women. They excluded participants with current pain or injury to the lower extremities or torso, or if they had a history of any lower extremity injuries or surgeries in the past 12 months.

The participants were assessed for their capacity to recruit core stabilizer muscles using lower abdominal strength assessment as described by Sahrman (2). This testing model has 5 levels of increasing difficulty used to challenge participants to maintain a neutral spine. The draw back of this method is that it is done in supine versus the standing position of this study, but the author acknowledges this limitation. Out of a possible high score of 5, five of the participants scored a 1 or 2, while the other nine scored a zero.

For the study, a six inch step was used to assess 2 reps of a single leg squat. Each participant was asked to perform the test with the dominant leg to standardize conditions. They performed the reps under two conditions:

1. CORE – engaged abdominal muscles as they had been instructed to do so during the Sahrman test

2. NOCORE – no purposeful engagement of abdominal muscles

Results

  • The CORE condition resulted in smaller hip displacements in the frontal plane but had no effect on hip angular range of motion – essentially there was less medial/lateral movement
  • The CORE group did not exhibit any changes in knee displacement but did exhibit greater degree of knee flexion – this may suggest higher function assuming more knee flexion is desired during squat tasks in sports and functional activities
  • Those scoring the lowest on the core assessments had larger improvements in performance when they did in fact activate the core musculature

How do we use this information to affect our practice?  Well, in terms of rehab it seems straightforward and many of us may already encourage patients to activate their core during treatment.  However, I think the greater contribution may come in injury prevention programs (particularly ACL programs) where we are looking at all facets of neuromuscular control and appropriate muscle activation patterns.

With any prehab or rehab strategy, we as clinicians, trainers and strength coaches are essentially trying to reprogram the brain to summon and execute a better motor pattern or strategy – feedforward training.  We know that healthy individuals tend to have better transverse abdominus and multifidus muscle activation, so it only makes sense to consider activation of local stabilizers as we work on global muscles.  Improving core and pelvic stability should only help reduce unwanted frontal plane motion.

With that said, the authors of this study readily acknowledge more work needs to be done with larger clinical populations (including EMG work) to more clearly identify what magnitude the core musculature has on lower extremity motion and displacement.

Keep in mind the proper program will always stem from your ability to assess movement impairment and tissue dysfunction.  I suggest beginning with a FMS in the athletic population and incorporating parts of that or the SFMA to compliment your evaluation in the clinic.  This will generally reveal the priorities for the corrective exercises.  For now, we can use this information in this particular study to be more intentional with our patients and clients suffering knee and hip dysfunction by adding this one simple step to our programming.

References

1. Claiborne TL, Armstrong CW, Gandhi V, Princivero DM. Relationship between hip and knee strength and knee valgus during a single leg squat. Journal of applied biomechanics. 2006;22(1):41.

2. Faries MD, Greenwood M. Core training: stabilizing the confusion. Strength & Conditioning Journal. 2007 ;29(2):10.

six-pack-shortcuts-kettlebell-cardio-routines

Kettlebells are very popular training tools these days.  I find them useful in many ways – improving grip strength, core activation, asymmetrical loading, etc.  With that said, I also feel with movement flaws and/or improper technique, they carry an inherent injury risk.

It is interesting to note that some people find swings to be very therapeutic and good for their back, while others who are capable of lifting very high loads with traditional lifts find them to be irritating to the spine.  So why is this?

If you are like me, knowing the “why” or “cause and effect” behind exercise is very important.  I am not one to blindly use an exercise without knowing its intended purpose and then quantifying risk vs. reward and results. So, it was with great interest I read Stuart McGill and Leigh Marshall’s recent article on kettlebell swings, snatches and bottoms-up carries in the NSCA Journal of Strength & Conditioning Research (Jan 2012).

Click here for the abstract.

While the sample size is small, I think the article provides some gems in regard to training given no one has really looked at spine loading during various swings and carries.  The authors used surface EMG to record muscle activation of the back, hip and core muscles throughout the various exercises – swing, swing with Kime (abdominal pulse at top of the swing), swing to snatch, racked carry and bottoms-up carry.

Without going into all the tiny details, I wanted to share what I consider to be some key takeaways for rehab and training:

  • Unlike traditional low back extension exercises such as lifting a bar or squatting exercises, the swing creates a relatively high posterior shear force (namely L4 on L5) in relation to the compressive load – this may explain why some powerlifters have no issues with heavy dead lifts but are bothered by swings
  • Both compressive and shear forces were highest at the beginning of the swing
  • From a compressive standpoint loads with a 16 kg kettlebell (swing) are less than one-half of that of lifting 27 kg on an Olympic bar and these would seemingly pose a low relative injury risk
  • KB swings do appear to require sufficient spine stability in this shear mode to ensure that is is a “safe” exercise selection
  • Those with back pain develop movement flaws and the authors report one of the most common is to move the spine under load instead of the hips – so instead of hip hinging, injured clientele are more apt to shift or bend the spine leading to repetitive and harmful forces
  • A modified approach to swings with careful cueing and progression is suggested for clinicians
  • The bottoms-up carry poses more challenge to the core musculature likely due to requiring more grip strength (thus stiffening the core per McGill in Ultimate Back Fitness & Performance) as well as necessitating more control to carry it, hence making it a good choice for training in terms of activation of these muscles

So, in my mind kettlebell training (like any other form of training) requires proper form, movement assessment and an intimate knowledge of the client’s medical and training history.  In addition to that, we must carefully scrutinize execution of the exercise and deliver appropriate feedback and analysis.

While maximal shear occurs at the bottom, I cannot help but wonder about the potential impact of tight iliopsoas muscles given their unique relationship to the lumbar spine and reverse muscle action.  It would be interesting to know if those with a greater anterior tilt and tightness are more likely to experience higher shear forces or potential back soreness over time.

This brings the discussion back to quality of movement and movement assessment.  In my mind, adequately assessing the hips (flexibility, strength and stability) is also a key variable in determining how best to approach integrating the swings.  As Gray would say, the lumbar spine needs stability while the hips require mobility.

A lack of hip mobility is definitely a relative precaution for swings in my mind.  On top of that, fundamental hip strength/stability and core strength should be evident.  Perhaps even regressing to rudimentary hip thrusts and bridges may be the best place to start for those needing a primer on form and proper movement before moving to a basic swing.

Nonetheless, a big thanks to Stuart McGill and Leigh Marshall for this work and giving us some practical food for thought.  I hope this information helps you as much as it did me.  May your training be safe and effective!

Through my clinical practice and sports performance training, I continue to focus on eliminating core and hip dysfunction.  I think many of the knee problems I see in runners and females are related to weakness in the glutes and small lateral rotators.  There has also been quite a buzz about a recent article written in the Strength & Conditioning Journal on crunches and whether spinal flexion may actually be good for you.

This topic alone could take up several posts so, I will not delve into that today.  However, as one who has experienced sciatica and disc injury firsthand, I probably tend to fall a little more in the camp of focusing on a neutral spine and resisting external forces as I feel this helps improve performance and reduce injury risk.  In that vain, I have been continuing to develop my own core and hip stability progressions with my advanced clients/athletes.

I have been doing a series of posts for BOSU and PFP in my Functionally Fit Column.  In my last post, I covered a 3D mountian climber with hip extension.  In today’s post,  I am covering a great core exercise with the BOSU Ballast Ball focusing on hip extension with the goal of improving shoulder, core and hip stability while promoting hip extension and disassociation.

In the video below you can check out the progressions (incline and decline)

Click here to read the full article on technique and application.  The article reviews a regression for those not ready to tackle this quite yet.  I think you will find this exercise challenging and rewarding.