Brian Schiff’s Blog

It is clear that our society loves shoes and fashion.  The problem is that fashion often does not equate to good function.  Keep in mind your feet set the tone for the rest of your body’s biomechanics so it stands to reason that one would want to pay close attention to their foot structure and use the RIGHT shoes more often than not.

I treat and evaluate lots of runners on a weekly basis.  I use the FMS, selective testing and gait analysis to help them resolve mechanical issues, overuse problems and improve running efficiency.  However, when it comes to making footwear choices, I can only counsel them on what is best.

Recently, I wrote a column for Endurance Magazine on the impact of high heels and flip flops as it relates to injury risk.  At the end of the piece, I give some exercises to address shortened muscles and soft tissue.  I think all women who enjoy running (symptomatic or not) should give this a read.  Click here to read the article.

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.

Research has shown that strengthening the gluteus medius is clearly an essential way to reduce anterior knee pain and improve pelvic stability and function.  The exercise I am sharing today is useful for improving hip strength and pelvic stability in a closed chain fashion.

In the video below, I demonstrate a very effective way to strengthen the gluteus medius and improve hip stability.

For a full description of the exercise, check out my latest column, Functionally Fit, by clicking here.

I thought a fitting way to kick off the new year would be to share the top 10 things I learned or embraced that have most shpaed and impacted my training and rehab this past year.  In no particular order I will rattle these things off.  I hope at least one of these little pearls has a positive impact on your training and/or rehab as well.

1. Often times it appears necessary to perform a biceps tenodesis or tenotomy in active adults undergoing a SLAP repair to ensure more predictable pain relief.  I heard this at a sports medicine conference last May and I can tell you those patients having this done alongside their shoulder surgeries seem to recover quicker with less pain relief.  With that said, keep in mind that SLAP tears are difficult to define and operate on as surgeons still do not have great agreement across the board on defining the extent of injuries and how to deal with them (operative vs. non-operative).
2. Performance on the Functional Movement Screen (FMS) has little to no correlation with athletic performance.  I screened an NBA player and an NFL player this year who both failed the screen.  However, they obviously have mad athleticism and genetic ability.  Keep in mind the FMS is a valuable tool used to assess movement and expose injury risk patterns based on the 7 tests.
3. Soft tissue therapy is undervalued and misunderstood by most lay people.  Assessing tissue restrictions and educating our clients to perform self myofascial release techniques is essential if they want to compete and remain healthy day in and day out.  Specific problem areas I have increased my focus on this year have been the psoas, soleus and posterior rotator cuff/joint capsule.  Click here for my soleus blog post.
4. Core training is probably as much about not moving as it is about generating force with movement.  I read work from Stuart McGill and other smart people in the field, and the concepts of anti-rotation and anti-extension are sound concepts to explore and look more closely at.  Many times, performance in sport and life require us to resist movement and maintain position so strengthening the core to resist potentially harmful and stressful motions is and should be an important part of training and rehab programs.  Understanding how to facilitate and activate core musculature in the training to protect the spine and improve mobility/strength is key.  Click here for more on my core training.
5. Hip dissociation is an important element to train as the lack of it can impact function and performance in a negative way.  We assess it on the active SLR in FMS and I see the lack of it show up on clinical exams all the time.  Whether it is HS tightness, hip flexor weakness or simply poor neuromuscular control, clients who are unable to effectively dissociate the hips are more prone to injury and limited performance.
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