Brian Schiff’s Blog

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)

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

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So, a very common issue I see in runners is iliotibial band (ITB) syndrome.  In a nutshell, it involves excessive rubbing or friction of the ITB along the greater trochanter or lateral femoral epicondyle.  It is more common along the lower leg just above the knee and typically worsens with increasing mileage or stairs.

The ITB is essential for stabilizing the knee during running.  Several factors may contribute to increased risk for this problem:

• Muscle imbalances (weak gluteus medius and deep hip external rotators)
• Uneven leg length
• High and low arches
• Increased pronation leading to excessive tibial rotation = friction of the band
• Improper training progression
• Faulty footwear
• Poor running mechanics
• Limited ankle mobility (specifically dorsiflexion)
• Tightness in the tensor fascia latae (TFL) and glute max

Related information on this topic include a 2010 study published in JOSPT on competitive female runners with ITB syndrome:

Click here to see the abstract of the study

Click here to read an earlier blog post analysis of the above research article

Common signs and symptoms include stinging or nagging lateral knee pain that worsens with continued running.  Hills and stairs may further aggravate symptoms.  Some runners even note a “locking up” sensation that forces them to stop running altogether.  How do I treat this?

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This is a quick post to announce that I have joined forces with Allied Health Education, a new company founded to provide relevant education for allied health professionals, personal trainers and strength and conditioning professionals.  It is a therapist owned company dedicated to delivering affordable evidence-based continuing education.

I will be doing webinars on SLAP tears (this one is open for registration now) and FAI as well as a live one day course in September on the knee (breakouts will focus on running, ACL and arthritis).  For more information and current course listings, visit them online at www.alliedhealthed.com.

Well, after a silent stretch the past 2 weeks or so related to my study/preparation for the OCS exam, I am back to blogging! Today’s post is a pertinent one for runners and athletes suffering from lower limb injuries.

Static stretching has taken a bit of a beating in the strength and conditioning world in the last few years. Dynamic warm-ups and active mobility have taken center stage as of late.  While these active modalities are certainly superior for prior to practice, play and ballistic activity periods, I still believe stretching has a place in rehab and conditioning.

Interestingly enough, a study recently published in the March 2012 Journal of Strength & Conditioning Research examined the effects of static stretching of the calf and its impact on the strength/ROM of the contralateral side.  Click here for the abstract.

In a nutshell, the authors had two groups of untrained individuals: test group (6 male and 7 female subjects) and control group (6 male and 6 female subjects) who participated.  The test group did supervised active right calf stretching 3 days per week for 10 weeks (four 30 sec stretches w/30 sec of rest between stretches).  They stood on a beam 30 cm above the floor with the left knee slightly bent to offload the left leg as well as placing the hands on the wall while they leaned forward allowing the right heel to drop toward the floor until a max tolerable stretch was felt.  The knee was straight throughout on the stretch side.

Control subjects did no stretching at all.  All subjects were instructed to maintain their normal physical activity but refrain from any resistance training or stretching during the 10 week investigation.  The results:

• 29% increase in 1RM calf raise strength on the right
• 11% increase in 1RM calf raise strength on the left
• significant 8% increase in calf ROM on right
• significant 1% decrease in calf ROM on the left (non stretch side)
• No change in strength or ROM for control group

The authors conclude that the results of this study best apply to rehab settings.  For example, they suggest that this procedure may be an effective way to combat the loss of strength in limbs that have been immobilized after injury or surgery simply by stretching the mobile (unaffected) side.  They also point out that this may be a way to mitigate strength loss when access to traditional strengthening modalities are not readily available.

Clearly, athletes suffering an acute ankle sprain as well as runners suffering soleus/Achilles/lower limb overuse injuries would benefit from such a strategy. So why does this work?  Zhou in earlier work describes a cross training effect due to neural adaptations regulated in the spinal cord.

What does this mean for you and me?  Well, as someone who works with many runners I am always looking at eccentric control of the G/S complex as well as effective single leg heel raise strength.  The idea that stretching the uninvolved side to strengthen the involved side seems like a no brainer.  Clients suffering from tendonitis, plantar fasciitis, stress reactions, sprains and other injuries can use this as an early intervention without stressing the involved side.

More importantly, I like the idea of increasing neural adaptation and ROM in the stretch side through eccentric load as the dissipation of ground reaction forces will be more efficient in a calf that effectively handles eccentric loads through a sufficient range of motion.  This study definitely highlights the importance of stretching in novice runners and those with tight gastrocs. I am curious if the bent knee stretch would have had a similar effect primarily on ROM – perhaps they will investigate that further in the future.

As we move more toward mid and forefoot running gait, I believe the fitness of the G/S complex will be even more important than before as stress is transferred away from the knee and more toward the foot/ankle complex.  Clearly, we need more studies in trained subjects on unilateral stretching to determine if the same effects and degree of impact will be seen, but this study shows some promise for active static calf stretching in the appropriate populations.

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.

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.