17 Jul 2013

Does Kinesio Tape Work?

1.          Aim

To use peer reviewed journals to assess whether or not kinesio tape works better then traditional tapes, if so in what ways and in what instances should it be used.

2.          Intended Audience

The general public but also anyone involved in health and fitness. There is also assumed knowledge as to what Kinesio tape is.

3.          Introduction

Kinesio tape is not a new product, in fact it has been around for about 25 years or so[1]. Dr Kenso Kase developed the tape in the 1970’s and it has been used in Asia through out this time[2]. So why has it suddenly exploded in the last few years. The main reason was the 2008 Olympics. The tape was donated to 58 different countries1 to use on their athletes during the games, raising its profile greatly on the world stage.

The proposed benefits of the tape include improved posture, lymphatic drainage, blood flow, increased power output, improved biomechanics, decreased pain, joint support, relaxing over loaded muscles[1] [2] and generally making you an all round better individual! It’s like there is nothing this tape can’t do.

Okay the last one isn’t true but you take the point. How can this one tape do all of this? An evidence based approach to rehabilitation and training is what all those involved in the health and fitness sector should be striving for. As such I decided to look at the evidence myself, to improve my own learning on the subject and to help give other individuals an informed review.

4.          What the evidence says

Despite being around for a while the evidence regarding the kinesio tape is shaky at best. There is little of it and what can be found is of fairly low quality mainly due to poor study design or general bias [1],[3],[4]. So what does the current research conclude?

There is weak evidence to suggest there could be increased muscle activity [2]. Huang C., et al, 2011, found they could illicit greater muscle activity from the triceps surae (calf muscles), however, this didn’t translate into higher vertical jump scores. As such they conclude that there could be some benefit to rehabilitation of injuries where by the goal is to increase muscle activity, however, they added that their study was too small and did not cover a wide enough population in order to create recommendations for the general public.

Campolo M., et al, 2013, found no difference between a traditional taping method and Kinesio taping on anterior knee pain. Both techniques and materials gave pain relief but it was noted the participants had never experienced any taping before and therefore this could have been a placebo effect that was not adjusted for. In conclusion a larger, more in depth, well designed study must take place[5]. Ayatar A., et al, 2011, also found no effect on either knee function or pain for those with patellofemoral pain sydrome (pain under the knee cap)[6].

McConnell Taping [5]

Kinesio Taping [5]



Paoloni M., et al, 2011 and Castro-Sanchez A.M., et al, 2012 both investigated the effects of kinesio taping on lower back pain. Both concluded that there could be some use of Kinesio taping for rehabilitative purposes as they notice a small decrease in pain.  However, they both state that further research is needed to confirm finings. It should be noted in the case of Paolini, 2011, there was no placebo group and only focused on a sub group of those with chronic back pain (those who struggle with flexion relaxation)[7],[8].

Chang H.Y., et al, 2013, investigated the effects of Kinesio taping on medial elbow epicondylar tendinopathy (often manifested as “golfers elbow”). This time they did use a placebo group and found there was no difference at all between the groups[9].

5.          Conclusion

It would appear the old saying “if its too good to be true; it probably is” might apply here. I can’t find any scientific basis to any of the claims regarding elastic type taping. This is not to say there aren’t studies out there that do, and indeed would ask that if you know of any to bring them to my attention as I would very much like to review them. I am very much aware of the vast amount of anecdotal evidence of people who swear by the stuff. Of course there is nothing wrong with this, if it gives those individuals the edge they need to overcome injury or improve their training then great. The point is, that as far as I can tell, these effects are based on placebo, short lived, seem to mask the root cause of an issue or at the very least that Kinesio tape is no better than traditional types of taping.

The real issue is why are you taping in the first place? Utilising taping in sport should be done to help protect an area of weakness. Be that a joint or a muscle. As such you are trying to limit range of motion (ROM) or offer support and therefore you use a rigid tape. The taping is either compressing a joint, moving it into a less painful position or unloading hypertonic muscles (overly tense muscles). It is difficult to do this with elastic type tapes. It is also still a temporary measure to allow you to be active in the short term, not a cure (i.e. strapping a painful ankle before rugby). Realistically you shouldn’t be playing on it if you have pain and weakness, you should be rehabilitating it. You should be focusing on faulty postures to restore correct muscle length - tension relationships, reviewing the foods you eat, focusing on your training, performing the correct rehabilitation exercises to ensure the joint or muscle can support itself and doesn’t require the help of external support (i.e. tape!!). This is how you improve performance, not through taping.

Taping of any kind can be useful for those playing at a high level to aid in their recovery from injury as they are on contracts etc and are under pressure to play. It can also be used by physios and rehabilitation specialists as an aid to other treatment modalities. But it should not be relied upon as some sort of quick fix (“you’ll be fine, just strap it up”). Personally I believe too many people rely on tape in this way, rather than focusing on the underlying concerns of gross joint instability, poor posture and other muscle imbalances. This is not to say I don’t use tape, I have in the past and will do in the future, but the intent is always to use it in conjunction with further rehabilitation. In short, any taping should only be used as part of a clinical risk assessment, taking into account benefits versus costs to the individual (and in some cases the team as a whole), not just slap on the tape because “that’s what the pros do”.

Hope this was as enlightening for you reading it, as it was for me researching it.

All the best


Gregory Hunt


6.          References





[1] Williams S., et al. Kinesio in treatment and prevention of sporting injuries. Sports Med. 2012 Feb 1;42(2):153-64.

[2] Huang C., et al. Effect of the Kinesio tape to muscle activity and
vertical jump performance in healthy inactive people. Biomedical Engineering Online. 2011; 10: 70.

[3] Morris D., et al. Clinical effects of Kinesio Tex taping: A systematic review. Physiotherapy Theory & Practice. 2013 May;29(4):259-70. http://www.ncbi.nlm.nih.gov/pubmed/23088702

[4] Mostafavifar M., et al. A systematic review of the effectiveness of kinesio taping in musculoskeletal injury. Phys Sportsmed. 2012 Nov;40(4):33-40. http://www.ncbi.nlm.nih.gov/pubmed/23306413

[5] Compolo M., et al. A comparison of two taping techniques (Kinesio and McConnell) and their effect on anterior knee pain during functional activities. The international Journal of Sports Physical Therapy. 2013 April; 8(2): 105-110.

[6] Ayatar A., et al. Initial effects of kinesio taping in patients with patellofemoral pain syndrome: a randomized, double-blind study. Isokinetics and Exercise Science 2011;19(2):135-142. http://search.pedro.org.au/pedro/browserecord.php?recid=6153

[7] Paoloni M., et al. Kinesio Taping reduces disability and pain slightly in chronic non-specific low back pain: a randomised trial. European Journal of Physical and Rehabilitation Medicine. 2012;58(2):89-95. http://www.tapingbase.net/sites/default/files/kinesio_taping_applied_to_lumbar_muscles_influences_clinical_and_electromyographic_characteristics_in_chronic_low_back_pain_patients.pdf

[8] Castro-Sánchez A.M., et al. Kinesio Taping reduces disability and pain slightly in chronic non-specific low back pain: a randomised trial. Journal of Physiotherapy. 2012;58(2):89-95.

[9] Chang H.Y., et al. The Effectiveness of Kinesio Taping for Athletes with Medial Elbow Epicondylar Tendinopathy. Int J Sports Med. 2013 Jun 14. [Epub ahead of print] http://www.ncbi.nlm.nih.gov/pubmed/23771826



21 Jun 2013

Core Stability: Science or Hocus Pocus?


1. Aim

To investigate whether core stability should be used in exercise and rehabilitation programs; and if so, how and when should it be used.
2. Intended audience
The general public, however, there are some interesting pieces of research here for any trainer or health professional.
3. Introduction

These days the public are bombarded with the term core stability. Many different trainers and therapists proclaim that core stability training should be at the heart of any exercise program to help prevent or treat injury. I myself have used various core stability exercises in the rehabilitation of clients with back injuries, as I was taught during my studies. I have also used core strength exercises to self treat my own injuries.  However, since then much information has come to light indicating flaws in the core stability concept and whether we should be using it at all.
4. The Concept

The basic idea is that within your abdominal cavity there is an imaginary box and that by contracting the muscles that form this box it will increase the pressure within it (intra-abdominal pressure), thus you will support the lumbar spine. See muscles and pictures below.

1. Top of the box - diaphragm

2. Sides of the box - obliques

3. Front of the box - transversus abdominis (TVA)

4. Back of the box - lumbar multifidus

5. Bottom of the box - pelvic floor muscles

There are, however, other models of core stability that include all combinations of muscles between the sternum and the knee1. This of course poses the first problem which is how do we objectively measure “core” when there is still no consensus on exactly which muscles are involved.








The principle is to illicit 30% of maximal voluntary contraction (MVC) of the core muscles. The focus is generally on holding the contraction for a period of time to increase endurance in the core muscles and so create a solid foundation for the limbs to then work from. Below is one example of a schematic explaining the overall ideology.





5. What the evidence says

In short the journals don’t seem to support the principles mentioned above.

One article by Professor Eyal Lederman2 highlights these negative factors in some detail supported by a hefty reference list. In particular he believes the focus on TVA is misplaced. His view is that there is an over emphasis on TVA contraction (often performed by the drawing in of the naval towards the spine). He agrees that TVA plays a role in supporting the lumbar spine but so do many other muscles in the body; so why focus on TVA?

He also tackles the issue of timing. It is believed that whenever you perform any action (like reaching into a cupboard or kicking a ball) your core (TVA) should fire before your limbs move. This is supposed to protect your back. However, the research doesn’t support this either. The difference in onset of contraction for those with chronic lower back pain (CLBP) and those without is about 1/50 of a second. Too small to consciously effect and too small for any therapist to analyse without some pretty sophisticated kit!2

Sharrock et al, 20111, conducted a pilot study to investigate the link between core stability and athletic performance. Although they found some positive results giving direction for further research, they concluded by stating:

“Until the relationship between core stability and athletic performance can be scientifically demonstrated in the evidence, it will remain hypothetical and theoretical in nature”

Wang et al, 20123, found some data indicating that in the short term core based exercise programs had some advantages over a traditional physiotherapy approach in the management and function of low back pain (LBP). However, they caveat this by highlighting the fact that the data used for the meta-analysis was of low quality and that further definitive studies would need to be conducted.

Muthukrishnan et al, 20104, found no difference in pain or function outcomes for those presenting with chronic low back pain (CLBP) concluding that core stability exercises were not as good as traditional physiotherapy approaches.

Gordon et al, 20135, conducted a study to review if there was any relationship between core stability, hip external rotator strength and balance. They found there was no link between the test parameters and therefore a strong core had no effect on prevention of lower limb injuries.

Gorbet et al, 20106, investigated if there was any difference between TVA activation in healthy individuals and those with LBP. They found no difference. Yet proponents of core stability exercises state that a lack of TVA activity is one of the main causes of LBP. They did however find that the Abdominal Draw In Method (ADMIN) was better than four point kneeling for activating TVA.


ADIM start position from Gorbet et al6



Quadruped start position from Gorbet et al6

Martuscello et al, 20137, concluded that strength and conditioning programs should focus on multi joint free weight exercises and not core specific exercises when looking to improve the core muscles.

6. Summary of the evidence

It is very difficult to find even one study that out right proves, unequivocally that specific core stability exercise directly improves LBP or sporting performance more effectively than traditional physiotherapy and training programs. One study showed that a nine-week core program improved volleyball jumping performance10, however, it didn’t compare this with the effects of standard exercises. We have seen that other studies indicate standard physiotherapy and training interventions give the same if not better results so maybe these too would help improve jumping performance in volleyball?

Some of the studies have found there to be some benefits from a core program for those with LBP8, 9 however, the dominant finding is that LBP (especially CLBP) is too multifaceted to be treated by core stability exercises alone and should be incorporated into a wider rehabilitation program. On a separate note instability devices have been shown to help in rehabilitation as it increases co-contractions which aid stabilisation of recovering joints and soft tissues. 

7. Conclusion

By no means is this article designed to rubbish what trainers and therapists are currently using to treat their clients, it is simply meant to highlight the research and to get health and fitness professionals thinking. Does this mean as a client you should quit your Pilates subscription today? No! Many people profess to greatly enjoying Pilates and gaining great benefit from it. As yet there is no sound evidence to suggest that core stability exercises are hurting people (although this point is raised by Professor Lederman2). However, do I think that core stability is the foundation of any training and rehab program as many proclaim ........ I think not. Could you achieve your goals more quickly and efficiently by spending less time focusing on a few muscle groups in isolation......I think you can!

N.B. I strongly recommend reading the article by Professor Lederman2 as a basis for further reading on the ideas put forward above.


References

1. Sharrock C., et al. A pilot study of core stability and athletic performance: Is there a relationship? International Journal of Sports Physical Therapy. 2011 June; 6(2): 63–74.

2. Lederman E. The myth of core stability. Journal of Body Work and Therapies. 2010; 14: 84-98. http://www.craigliebenson.com/wp-content/uploads/2010/08/sdarticle.pdf
3. Wang X., et al. A Meta-Analysis of Core Stability Exercise versus General Exercise for Chronic Low Back Pain Public Library of Science One. 2012; 7(12): e52082.

4. Muthukrishnan R., et al. The differential effects of core stabilization exercise regime and conventional physiotherapy regime on postural control parameters during perturbation in patients with movement and control impairment chronic low back pain. Sports Medincine Arthroscopy Rehabilitation Therapy Technology. 2010; 2: 13. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2903540/

5. Gordon A.T., et al. Relationship between core strength, hip external rotator muscle strength, and star excursion balance test performance in female lacrosse players. International  Journal of  Sports Physical Therapy. 2013 April; 8(2): 97–104.
6. Gorbet N., et al.  No Difference in Transverse Abdominis Activation Ratio between Healthy and Asymptomatic Low Back Pain Patients during Therapeutic Exercise. Rehabilitation Research and  Practice.  2010; 2010: 459738. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3200274/
7. Martuscello J.M., et al. Systematic review of core muscle activity during physical fitness exercises. Journal of Strength & Conditioning Research. 2013 Jun;27(6):1684-98.

8. Behm D., Colado J.C.  The effectiveness of resistance training using unstable surfaces and devices for rehabilitation. International Journal of Sports Physical Therapy. 2012 April; 7(2): 226–241. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3325639/
9. Di Lorenzo C.E. Pilates: What Is It? Should It Be Used in Rehabilitation? Sports Health. 2011 July; 3(4): 352–361. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3445206/ 
10. Sharma A., et al. Effects of a nine-week core strengthening exercise program on vertical jump performances and static balance in volleyball players with trunk instability. Journal of Sports Medicine and Physical Fitness. 2012 Dec;52(6):606-15.


Bibliography

Allison G. T., Morris S. L. Transversus abdominis and core stability: has the pendulum swung? British Journal of  Sports Medicine. 2008;42:930-931.

Brumitt J., Dale B.R. Integrating Shoulder and Core Exercises When Rehabilitating Athletes Performing Overhead Activities. North American Journal of Sports Physical Therapy. 2009 August; 4(3): 132–138. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2953337/
Childs J. D., et al. Effects of Traditional Sit-up Training Versus Core Stabilization Exercises on Short-Term Musculoskeletal Injuries in US Army Soldiers: A Cluster Randomized Trial. Physical Therapy. October 2010 October; 90 (10): 1404-1412.

Erbulut D.U., et al. Biomechanics of Posterior Dynamic Stabilization System. Adv Orthop. 2013; 2013: 451956. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3626386/

Freeman J., et al. Pilates based core stability training in ambulant individuals with multiple sclerosis: protocol for a multi-centre randomised controlled trial. BMC Neurology. 2012; 12: 19. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3364845/

George S.Z., et al. Brief psychosocial education, not core stabilization, reduced incidence of low back pain: results from the Prevention of Low Back Pain in the Military (POLM) cluster randomized trial. BMC Medicine. 2011; 9: 128. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3286400/
Granacher U., et al. Effects of core instability strength training on trunk muscle strength, spinal mobility, dynamic balance and functional mobility in older adults. Gerontology. 2013;59(2):105-13. http://www.ncbi.nlm.nih.gov/pubmed/23108436
Lee T., et al. A comparison of pain level and entropy changes following core stability exercise intervention. Medical Science  Monitor. 2011; 17(7): CR362–CR368.

Reed C.A., et al. The effects of isolated and integrated 'core stability' training on athletic performance measures: a systematic review. Sports Medicine. 2012 Aug 1;42(8):697-706.
Sukalinggam C.L., et al. Stability Ball Training on Lower Back Strength has Greater Effect in Untrained Female Compared to Male. Journal of Human Kinetics. 2012 June; 33: 133–141. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3588679/

Van Dieën J.H., et al. Effects of fatigue on trunk stability in elite gymnasts.Eur J Appl Physiol. 2012 April; 112(4): 1307–1313.











21 May 2013

How to Squat: God only knows!


1.          Aim

To investigate if there is such a thing as “the perfect squat technique” or does it all depend on what you are training for?

2.          Intended audience

Primarily the article is written with professional trainers and rehabilitation specialists in mind, although it would also be of interest to anyone who enjoys training.

3.          Introduction

Narrow squat, wide squat, front squat, back squat, feet turned out, feet turned in, bar high on the shoulders, bar low on the shoulders, deep squat, don’t deep squat. The endless list of conflicting theories on how to squat correctly leaves one feeling altogether dizzy, with each fitness guru vehemently defending their technique as the only way to perform a proper squat. However, very few online resources or trainers back up their positions with actual scientific evidence. I certainly didn’t when I first started out as a Personal Trainer. However, I intend to in this article. I include my conclusion at the end of this article, but it is only that, my conclusion. You will have to decide for your self.

4.          General Overview of the Research

It is important to note that for the purposes of this small article the research focuses mainly on the knee. Escamilla, 2001[1] breaks the research down into the following key areas:

a.          Knee forces including tibiofemoral shear force, tibiofemoral compressive force and patellofemoral compressive force.

b.          Knee muscle activity focusing on quadriceps, hamstrings, and gastrocnemius.

c.          Knee stability in the sagittal plane and the frontal plane (i.e. anteroposterior and mediolateral respectively).

This journal is primarily used in this article as it already includes the majority of the studies I came across.

The rest of the data then looks at foot position, knee position relative to the feet and various different squat techniques. This data gives you information relating to the forces generated at various joints and muscle recruitment.

I then reviewed research on the injuries sustained from squatting, particularly focusing on Powerlifting and Olympic lifting. This would then (in theory) give me the actual outcome of the relevant lifting techniques on the health of the joints.

5.          So is there a Correct Foot Placement?  

In short, it would appear not. The angle of the foot would appear to have no relation to either which muscles are targeted (i.e. Vastus medialis or lateralis) or how much they are recruited, as is commonly believed amongst the training industry [1][5]. There also appears to be very little difference between wide or narrow stance squatting. The only significant difference being that narrow squats seem to elicit more muscle activity from the gastrocnemius [1] [2]. Where as wide squats, when performed as Powerlifters do, with a low bar position on the shoulders and greater anterior trunk lean, seems to decrease the compressive forces at the patellofemoral joint [1]. This is believed to be due to a more vertical position of the shin when viewed in the sagittal plane (side on) thus decreasing the flexion angle of the knee [4]. A greater angle of flexion at the knee, means greater compressive forces at the patellofemoral joint. This information is important if you already have an existing knee condition, however, it doesn’t necessarily mean that a greater compressive force = greater damage to your knees. In fact nobody really knows exactly how much compressive force and stress (force divide/area) is damaging to the knee [1].

6.          Can the Knee Pass the Toe?

There is only one study I have been able to find that addresses this particular question specifically. There have been many fitness magazines and blogs that have been putting forward this idea that the knee can and in fact should pass the toe. However, it would appear this is only based on evidence from one study[3]. It concluded that preventing the knee from moving forward (moving past the toe) decreased the amount of stress at the knee, however, it shifted the stress to the hips and lower back. As such they suggested that, to achieve appropriate joint loading during the squat the individual should allow the knee to move slightly past the toe.

Unfortunately some studies have shown that the forward movement of the knee also increases shear forces at the tibiofemoral joint [1].

7.          Which Form of Squat is the Best?

By form, I am referring to bar placement and/or any machines used. Most literature looked at the front squat, back squat, leg press and a few relating to single leg squat and body weight squat. There was no evidence I could find on the above head squat. My focus is on the back or front squat as these are the most common.

In essence it appears to depend on what you are training for. Olympic lifters favour the front squat because it is a key component of the lifts they perform. The nature of the lift tends to keep the trunk more upright and often requires increased flexion angles at the knee. This leads to slightly higher compressive forces on the patellofemoral joint [1]. Powerlifters use the back squat with a low bar position and more forward trunk lean, the reason being to make greater use of the strong glutes and erector spinae muscles. As such the knees don’t suffer the same compressive forces (due primarily to decreased flexion angles at the knee[4]). The trade off however, is increased force placed through the hip and lower back region [1].

It is also important to note that some studies have found contrary to the above. They state that compressive forces at the knee are greatest during the back squat. Therefore they advocate using the front squat over the back squat for long term joint health and for those with problematic knees[5].

Regarding Smith Machines and Leg Presses, the studies show that these are not the best options for someone with healthy knees. Smith machine squats increase the shear forces at the tibiofemoral joint by 30 – 40 % when compared with free weight squats [1]. Shear forces are known to be damaging to the knee and should always try to be reduced. Muscle activity and knee forces are significantly less when using a Leg Press compared to free weight barbell squats . Thus, Leg Press is less effective at muscle development[6] and as such free weights should be utilised instead of the leg press in healthy, able individuals.

8.          How Low Can You Go?

All the evidence suggests that to decrease the compressive forces at both the tibiofemoral joint and the patellofemoral, you should only stick to the “functional range” which is 0°- 50°[1]. However, as stated before, increased compressive force doesn’t = damage to the knee. It is advantageous for athletes or those under training to work the body throughout the ranges of motion they are likely to perform in their chosen activities. So where does this leave us?

9.          What Do the Injuries Tell Us?

Nothing written above is really conclusive evidence to squat one way or the other. There is also an inherent issue with this type of literature as it attempts to predict the affects of different forces on the body. This means they have to use various mathematical models [1] that inevitably lead to problems of accuracy. This leads us to look at the injuries sustained while performing various techniques to see if this sheds any further light on the situation. Below are brief summaries from various studies regarding injuries sustained during weightlifting; either Olympic or Powerlifting.

110 elite lifters (Olympic and Power) were surveyed, both male and female. 2.6 injuries per 1000hrs of activity were noted. Most common were lower back injuries and shoulder injuries. It was also noted that Olympic lifters sustained more lower back and knee injuries whereas Powerlifters sustained more shoulder injuries[7].

245 competitive and elite Powerlifters from 97 Powerlifting Clubs were surveyed. 1 injury per 1000 hrs of activity were noted.  The injury rate is deemed as low when compared to other sports. The majority of the injuries were minor and did not affect training[8].

Information from a 6 year period from the US Olympic Training Centre focused on US elite Olympic lifters. Injury rates of 3.3 per 1000 hrs of activity were noted (combining both acute and recurring injuries). The majority of injuries (68.9%) were strains or tendonitis. 90.5% of injuries resulted in missing 1 day or less of training. In conclusion the majority of injuries for Olympic lifters were overuse injuries (likely from training programs that were too intensive). The rates of injuries were similar to those found in other sports[9].

25 experienced Olympic lifters were tested for effects of osteoarthritis (general wear and tear) on their joints. The study covered tibiofemoral joint, patellofemoral joint, hips, wrist, elbow and shoulder. Significant degeneration was found in only five of the lifters (20%) which is approximately half the number found in the general population. In conclusion weight lifting (Olympic or Power) was not deemed to be a pre-requisite to joint degeneration and may in fact improve stability and health of the cartilage. Having said that, previously injured joints were more susceptible to damage under heavy loads[10].

To put some perspective on these injury rates Fuller, et al, 2007, performed an extensive study into rugby, noting injury rates of 58 per 1000hrs of activity[11].

10.       Conclusion.

The evidence suggests it is about which technique is right for you and what you want to achieve, rather than which is the best all round. One of the main factors is whether or not you have an existing pathology in the knee. If you do, the evidence points to using quarter squats (0º - 50º of knee flexion) to strengthen the site. Use slow, controlled movements with feet approximately shoulder width apart and in a position of turn out that is comfortable to you. Care should be taken for those with an injured PCL (posterior cruciate ligament) as slightly more strain is placed on the PCL compared to the ACL. However, squats are still a viable exercise for PCL rehabilitation under lighter loads.

For those of you who aren’t injured, there are 2 options:

1. You adhere to the evidence that attempts to predict the effects of squatting on the knee. In this case you would perform heavy, quarter squats (0º - 50º flexion at the knee), feet approximately hip width to shoulder width apart, turned out in a comfortable position for you. This would limit the amount of wear and tear on the tibiofemoral and patellofemoral joints, and the quadriceps and patella tendons. It would encourage compressive forces within the knee, which in turn improves stability. It would also rule out any over stretching of the ligaments and capsule surrounding the knee.

Or....

2. You take your lead from the evidence based around the outcomes of the training (i.e. the injuries found in Powerlifting and Olympic lifting). In this case you would use the techniques employed by either discipline depending on what you are trying to achieve. The evidence suggests there is no increase in injury risks from performing wide or deep squats, front or back. The key is a progressive training program with appropriate recovery to avoid over use injuries and bring about the correct adaptations in the body.

Personally, I subscribe to the latter option. It is evidence based on actual data that has definitely occurred, not predictions of what might happen. I enjoy mixing my training between each of the disciplines and I’m currently working on, deadlifts, clean and snatch. Therefore the majority of squatting actions I perform are those in the front squat position where by my knees travel slightly past my toes at some points during different lifts. As for my clients it completely depends on 3 things:

a.          What they are comfortable with.

b.          What they are capable of (i.e. injuries or disabilities).

c.          What their goals are.

These factors should always be considered when writing your own programs.

11.       Future Articles.

Further articles leading on from this will include program design, periodization and appropriate recovery to avoid injuries and gain consistency in your training.


All the best

Gregory Hunt


12.       References




[1] Escamilla R. F., et al.   Knee biomechanics of the dynamic squat exercise. Journal of American College of Sports Medicine. 2001. http://www.mlmixrun.com.br/artigos/Knee_biomechanics_of_the_dynamic.pdf

[2] Signorile J.F., et al. Effect of Foot Position on the Electromyographical Activity of the Superficial Quadriceps Muscles During the Parallel Squat and Knee Extension. The Journal of Strength and Conditioning. Aug 1995; 9, (3). http://journals.lww.com/nsca-jscr/Abstract/1995/08000/Effect_of_Foot_Position_on_the_Electromyographical.11.aspx

[3] Fry A.C., Smith J.C., Schilling B.K. Effect of knee position on hip and knee torques during the barbell squat. J Strength Cond Res. Nov 2003;17(4):629-33. http://www.ncbi.nlm.nih.gov/pubmed/14636100

[4] Switon P. A., et al. A Biomechanical Comparison of the Traditional Squat, Powerlifting Squat, and Box Squat. Journal of Strength and Conditioning. Jul 2012;  26 (7); 1805–1816 http://journals.lww.com/nsca-jscr/Abstract/2012/07000/A_Biomechanical_Comparison_of_the_Traditional.10.aspx

[5]Gullett J.C., et al. A biomechanical comparison of back and front squats in healthy trained individuals. J Strength Cond Res. Jan 2009;23(1):284-92. http://www.ncbi.nlm.nih.gov/pubmed/19002072

[6] Escamilla R.F., et al. Effects of technique variations on knee biomechanics during the squat and leg press. Journal of the American Sports College of Medicine. 2001. http://www.treinamentoesportivo.com/wp-content/uploads/2012/10/ARTIGO-AGACHAMENTO-01.pdf

[7] Raske A., Norlin R. Injury Incidence and Prevalence among Elite Weight and Power Lifters. American Journal of Sports Medicine [Website] http://ajs.sagepub.com/content/30/2/248.short#aff-3

[8] Siewe J., et alInjuries and Overuse Syndromes in Powerlifting. International Journal of Sports Medicine. 2011; 32(9): 703-711 https://www.thieme-connect.com/ejournals/abstract/10.1055/s-0031-1277207

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