Sunday, November 16, 2008

Testimonial


Paul and I started training at the start of the 2008 summer. My goal at the start was to gain a total of 15 pounds, in order to have an opportunity to play on a Jr.A team, in particular the Burnaby Express. As a 17 year old this would be crucial to my hopeful future success in hockey. Knowing Paul since the 2006 - 2007 hockey season, I knew what he was all about. Paul is a classy, hard working man who was always looking at the positives. When it came time to find a trainer for the summer the decision to ask Paul was not a hard one. I knew he would help me achieve my goal and lead me to the next level in hockey. Paul's calm and hard working demeanour helped me reach my goal of gaining muscle and making the Burnaby Express hockey club. Paul taught me that it's not always such a hassle to work out and that it can be fun and rewarding at the same time. I recommend anyone who is looking for trainer, a classy individual and a friend to go to Paul Hemsworth. He will put in the 100% effort level that many people look for and will do whatever he can to help you with what you want to do. Whether it's making the next hockey team or getting yourself into the shape that you've always wanted to be in Paul will be there for you with a positive attitude.
Simon Denis #77
Defenseman
Burnaby Express Jr. A

Wednesday, November 5, 2008

300 Problems

A while back I had a new client come in and book five sessions with me. A short amount of time to make progress yes, but enough to at least teach some basics to a newcomer to weightlifting. As I do with all of my clients, I asked this guy what he wanted to get out of these sessions. He responded by saying, "Well, I want to look like the guys from 300". For those of you who aren't familiar, 300 is an incredibly popular movie about 300 Spartans who fight until the last man against an army of 1 million soldiers. I haven't actually seen the movie (I took that last bit right off Google). Nonetheless, the half-animated characters that make up the film, define athleticism. These guys are built like brick s**t-houses. Sculpted arms, chiseled abs, pecks of steel, and not an ounce of body fat. Clearly, the type of guy that I was going to turn my six foot three, 160 lb newbie into in just 5 sessions.

Now, apparently there is a 300 workout that can be found rather quickly on the internet, as I was graciously informed via a link from my new client. All kidding aside, it looks like one hell of a workout. Here is what the workout consists of:
25 Pull-ups
50 Deadlifts at 135 lbs
50 Push-ups
50 Box Jumps at 24 inches
50 "Floor wipers" at 135 lbs
50 Clean and Press at 36lbs
25 More Pull-ups
Total: 300 reps.

Before I had even taken a look at the 300 workout, I knew that my client had been brutally misguided in how to get in shape and needed some education regarding his "realistic" goals. This is a guy who couldn't do one squat properly, nevermind 50 clean to presses. I quickly lectured him on the importance of learning proper lifting mechanics before jumping into a workout of this magnitude. Not to mention that this workout has been cookie-cut with the same load for everyone who uses it; or that genetics and body type simply does not allow for everyone to look like our 300 Spartans.

But can you blame the guy for thinking that by coming to a strength coach with a vision, it could become a reality in 5 sessions? Sadly, not entirely. So if you are my former client, please don't take offence to this, you inspired me to inform people on wise decisions. When you pick up any fitness magazine these days, it is jammed packed with juiced-up roid monkeys being portrayed as the ideological norm. If a page is not filled with supplements, it contains a quick-fix article about how to look like the Bond guy or how to create your own celebrity body. And the product of this kind of material? Millions of impressionable young men thinking this is plausible for them. Just as young women are struggling to portrait the "perfect" body that is rapidly shrinking to anorexic status, young men think that any guy can look like a Spartan. But when they fail to get the results they are looking for, suddenly that magazine comes in handy for another reason: Steroids. And truth be-told, that was the only way that my lanky client was ever going to resemble the likes of a 300 Spartan.

So, if you are reading this, and want to get into lifting for whatever reason, please learn the basics before jumping into a workout that is this comprehensive. The 300 workout is tough, and would probably produce some results if you already knew how to perform each lift properly. However, it is not the only way to get results. It has a catchy marketing scheme (300 Spartans/300 reps) and the buff characters for "evidence". It's great to come to a strength coach with a big goal in mind -as my client did - but understand the importance of learning basic technique before 300 reps of comprehensive lifting. This takes time, just as it takes time to learn basic chords before one can belt out Stairway to Heaven on the guitar!

Tuesday, November 4, 2008

Kettlebell Workshops

Just a quick hello and workshop update for November. Back by popular demand, Jim Talo will be running Part 1 and 2 of his Kettlebell Applications workshops. Part 1 will take place November 15 and Part 2 will be November 29th, both running from 2-5pm at Target Fitness. To register for these hands on workshops and to get more information regarding the details of Part 1 & 2, please visit the Human Motion website at www.humanmotion.ca.
Also coming up will be Part 3 of Cliff Harvey's ever popular Weightlifting Series: Introducing the Clean. The date is yet to be announced but will take part sometime in December. If you attended Part 1 & 2 and are interested in this workshop, please contact Cliff at cliff@humanmotion.ca as spots will definitely fill up very quickly.
That's all for now, but stay tuned for another rant and a couple articles very soon!

Wednesday, October 15, 2008

Monkey See Monkey Don't

I work at a gym where many other trainers train out of as well as regular gym go-ers who have memberships. This allows me to see a multiplicity of different styles of training, both good and bad. What I've noticed is a lot of people - both trainers and gym go-ers - will see something being done by someone and immediately insert it into their own workout routine or their client's prescription. Now I have no problem with people seeing an exercise and using it...let's not kid ourselves, we probably didn't make up the exercise. What needs to be considered when seeing a new exercise is the application of it. That is what sets people apart in the strength and conditioning industry. Specifically, I'm talking about the safety of the exercise.
Last night I witnessed a guy not only trying to perform a power clean himself, but also try to teach it to a client at the same time. I use the word "trying" because on more than one occasion I thought he was going to break both his and his client's back.
When I first started training, I did not know how to perform any kind of Olympic lift variation properly. Although I felt very confident in my sport science knowledge and athletic abilities, I still did not jump into "trying" to perform these lifts. Thus, I went to Cliff Harvey, a world champion all-around weight lifter for some training. I quickly realized how technical these lifts are and how much I needed to learn. Which brings me to my first point: Don't teach it unless you can do it yourself. If you are just working out for yourself, seek out an experienced and certified individual to teach you how to lift properly. If you are a trainer and see an exercise you'd like to prescribe, take note of the technique involved (such as a keeping a neutral spine) and not just novelty of the exercise itself. Strength is a skill and must be treated that way. Any type of Olympic lift variation is among the most technical exercises you will find. So, I'm begging you...if you want to teach these lifts or try them yourself, do your homework and seek out a qualified individual before the physios run out of cards to hand out.
This leads me to my next point. The other day I had a new client come in and ask me, "So, what is your background, and what kinds of certifications do you have?" I smiled and responded, "First of all, thank you for asking me that." Because of the way the fitness industry is set up, it is easier and easier to take a weekend course and call yourself a personal trainer. Now, I've met a few people without a Kinesiology background who have done this and are better trainers than some with the appropriate background. However, these are few and far between. I thanked my client because I think that most people, when looking for a trainer, should do their homework and find a qualified individual to train them. This is your health we are talking about here and we need to start treating it as the priority that we say it is! When you get a lawyer, would you seek out someone who didn't go to law school or have the appropriate certifications? Probably not.
I told my client that I was both a Certified Exercise Physiologist and Certified Strength and Conditioning Specialist, and then I explained to her the difference between the two and the process to getting certified. So when looking for a trainer, or if you are looking to get into training, you should seek out someone who has a degree in a Kinesiology related program, a certification that requires this specialization of schooling, and a governing body that insures the individual.
So, my two points in summary: 1) Don't teach it if you can't do it properly (seek qualified training), and 2) Do your homework when hiring a trainer!
Thanks for putting up with my rant!

Paul

Wednesday, October 8, 2008

Testimonial

I hired Paul as my strength coach in January 2008. At that time I was 41 years old, at least 40lbs overweight and feeling the effects of my unhealthy lifestyle. Which of course was non conducive of being body aware and living a balanced life. I realized it was the time for change and that it would require my complete commitment. Upon meeting Paul I was struck by his calm demeanor and ability to understand what is realistic. We devised a plan of achievable short and long term goals. Thus far Paul has been able to build me into someone whom enjoys working out consistently. This has resulted in a 20lb weight reduction and, more importantly, 3 inches reduced from waistline. These achievements were a result of Paul’s excellent technical knowledge of various aspects of fitness programs and weightlifting.

Paul’s emotional intelligence has been a key factor in my personal success. He has an innate ability to understand when to push and also when to back off without ever being told. I personally recommend Paul as a strength coach to anyone whether you are an out of shape businessman like myself who didn’t want to end up another statistic or a professional athlete.

Dave Morrish
Market Base
President
http://www.marketbase.biz/

Saturday, September 27, 2008

Kettlebell Training - Swinging your way to fitness! - By Paul Hemsworth

Kettlebells, and more importantly, the kettlebell style of lifting is one of the most effective overall training styles you will find. What makes the kettlebell such an effective tool is the versatility of improving strength, power, cardiovascular fitness, and joint stability/mobility. Expensive multi-station machines cannot even begin to compete with this space-saving, versatile training tool. Whether you want to workout at the park, the beach, at the gym, or in your basement, the kettlebell can be taken anywhere.
The first time I saw kettlebells, I felt the same way I did when I first saw those fat-melting vibrating belts: skeptical. At first glance, kettlebells appear to be a modified dumbbell at best. Nothing could be further from the truth. Kettlebell lifting is an art; a style of lifting that uses the unique shape of the bell to optimally groove the patterns and slings of the body. They are not meant for bicep curling or chest pressing, but rather technically sound, fully integrated movements. You see, kettlebell lifting is an endurance sport; it is about how long you can go for.

Hip Hinging and Activation for Strength & Power
The first time I was trained with kettlebells, my hamstrings and glutes were screaming at me for the next four days. It was truly one of the most well-rounded workouts I had ever been through. At the forefront of kettlebell lifting is the art of hip-hinging. This technique teaches you to use your glutes and core to preserve and protect your spine. For those of you who have trouble with the deadlift, the kettlebell swing, is a great way to learn how to create a hip hinge with proper gluteal activation. This hinge is the cornerstone of a strong and powerful deadlift.

Cardiovascular Benefits
During that first kettlebell lesson, I quickly realized how metabolically taxing this style of lifting is. For those of you who are looking to lose weight, I assure you that you very few modes of exercise will keep a sustained elevated heart rate the way kettlebell training does. And, the more muscles that are used during an exercise, the more calories will ultimately be burned. Kettlebell training uses all major muscle groups. Furthermore, interval training (alternating running hard and easy as an example), has been proven more effective in improving VO2max, anaerobic threshold, and excess post-oxidative consumption (EPOC) than slow, steady, long runs. Kettlebell lifting, for time, will lead to the same cardiovascular adaptations. You will be challenged through intervals using full body movements, while encouraging joint-sparing technique.

Stability & Mobility
Another aspect of kettlebell training that is hard to beat with other training modes is core stability. During the kettlebell swing for example, the muscles surrounding your spine need to act as a brake by bracing at the apex of the lift so that you do not go into excessive lordosis, or create a huge arch in your lower back. Because of this, it grooves a fantastic sequence of driving with your gluteals and braking with the core. Other lifts such as the Turkish Get-up require maximal stability to perform the lift properly and safely. The stability doesn’t stop at the core, however. Because of the off-set center of gravity of the weight, the bell allows the shoulder to find its own path for optimal force – or joint – closure. When performing an overhead push-press, the shoulder doesn’t have to grind through the movement, thus a safer alternative to barbells or dumbbells, especially for those with shoulder problems. Keeping with the shoulder, poor thoracic spine mobility limits many people in the amount of shoulder mobility or strength work that they can do. Both the kettlebell itself and kettlebell lifting techniques cater very well to these issues by allowing the chest to open up while keeping the shoulder “packed” into the socket.

I was privileged to sit down with RKC Level 2 & AKC certified coach Jim Talo to ask him a few questions regarding kettlebells.

Paul: Jim, to some people, kettlebell lifting may look unsafe. What can you say about this?
Jim: Often perspective limits how we accept or approach situations. Awareness of our capabilities for a given activity is much more important in my mind. An example of unsafe could be overweight, de-conditioned men playing golf or de-conditioned teenagers snowboarding. Without awareness and due respect, squatting in a power rack is unsafe. With a new tool, it is best to follow the instructions and use it in a manner for that which it is most beneficial. As with anything, become technically sound first.

Paul: Do you recommend getting a DVD and learning that way?
Jim: In my experience with new kettlebell lifters, DVDs' are a great resource as a reference along with some hands-on instruction with a coach. Most people need some adjustments to rediscover their primal movement patterns in order to move with the kettlebell. Most of the time, people try to lift (muscle) the kettlebell rather than initiate hip drive to push and swing the bell.

Paul: If you were to recommend three exercises for beginners to learn and get familiar with, what would they be?
Jim: The swing movement teaches one to initiate hip drive, the clean movement for transitioning into front squat, push press and eventual overhead lifting, and the turkish get-up. The get-up is not necessarily a kettlebell specific lift, however it is fantastic for promoting shoulder mobility and rotator cuff stability for overhead lifting that is prevalent in kettlebell work.

Paul: What are some common mistakes that people present with when lifting kettlebells?
Jim: The most common mistake is the kettlebell being lifted (muscled) like a dumbbell, rather than being projected by the hips. Another equally common issue is the need to teach people to move and hinge at the hips rather than at the waist. The advantage of kettlebells is that they tend to move in arcs, allowing the body to adjust mid-movement as needed. Barbells and dumbbells tend to be moved through linear paths close to the body. Kettlebells move through arcs and spirals allowing joints to find a 'groove' for particular movements.

Paul: How many times a week do you recommend lifting kettlebells and how would you supplement them into you regular training regime?
Jim: Kettlebell lifting methodology allows one to be very creative and may be attuned to one's goals. Kettlebells may be used to directly affect the posterior chain of the body and to address imbalances of shoulder strength, or they may be used as a cornerstone of a strength and conditioning program. The methodology would be in the prescription determined by one's goals. Many experienced and avid kettlebell lifters train 5 to 6 days a week.

Paul: Could you describe a quick kettlebell workout if crunched for time?
Jim: For someone just starting kettlebell work: kettlebell swings - 1 minute each hand; clean and push press - 5-10 reps per side; clean and front squat - 5-10 reps per side...rinse and repeat. If I had only 15 minutes: kettlebell snatches, double bell clean and jerks with some double front squats sprinkled in.

If this style of training sounds like it would suit you I highly urge you to educate yourself with the varying styles of lifting that kettlebell gurus Pavel Tsatsouline, Steve Cotter, and Valery Federenko have to offer. If you can’t learn from them directly, make sure that you get hands on training from a certified kettlebell lifter for the best results. You can contact Jim Talo for questions regarding kettlebells, or enquire about his workshops through the Human Motion website at http://www.humanmotion.com/. Jim’s has also co-authored a book called The Great Kettlebell Handbook. Go to http://www.productivefitness.com/ to order yours now!

Sunday, September 14, 2008

Analyzing Core Stabilization Techniques - Part 1: Bridging the Gap

As most of you know, the world of core stabilization has yielded as much attention as Paris Hilton buying a new Chihuahua. The difference: core stabilization warrants most of the attention it gets. I say “most” because as with many catchy terms in the fitness industry, it can be abused with the content that goes into defining these terms. However, for the sake of this article I am going to review what I feel to be the more logical techniques that are involved in stabilizing that snake-like structure we call the spine.

What is Core Stabilization?
That’s the million dollar question isn’t it? If you asked 100 different sport scientists that question, you would get 100 different answers. To me, core stabilization is the ability to create uncompromising stiffness around the spine as to not allow any “energy leaks” during various static or dynamic tasks. You may agree or disagree with me on that definition, but the bottom line is this: Whether you are an elite athlete, construction worker, or receptionist, chances are you will probably go through some sort of back pain in your life. So throw the 6-pack talk out the window for now and start thinking about the spine. If we can ensure the athlete is a column of strength with no kinks in the chain, then we can ensure optimal power with minimal force loads on the spine.

Abdominal Anatomy


Abdominal Wall
Internal & External Obliques (IO & EO): Involved in flexion, as their forces are redirected to the rectus abominis (RA) to enhance the flexor potiential. They are involved in lateral bending, twisting, and stabilization of the lumbar spine (McGill, 1991a, 1991b, 1992; Juker, McGill, and Kropf, 1998). Lastly, they are involved in active expiration (Henke et al., 1988).
Transverse Abdominis: Rotates thorax from side to side, increases interthoracic pressure, and is involved in defecation, urination, childbirth. The TA is also an anticipatory muscle.
Rectus Abdominis (RA): The major flexor of the trunk. It forms a continuous hoop around the spine by transferring the forces from the obliques. The upper and lower RA are activated together and at similar rates during flexion (Lehman & McGill, 2001): So throw your “upper and lower abdominal exercises” out the window.

Rotatores: Have a high number of muscle spindles and thus serve more as a spinal positioner than a rotator of the spine (Nitz & Peck, 1986). They are most active when trying to resist the rotation of the spine that the obliques and latissimus are likely causing.

Extensors
Longissimus & Iliocostalis:
Have thoracic and lumbar components. These are the major back extensors.
Multifidus: Extension of the spine but only through the correcting of spinal joints that are enduring stress. Line of action actually contributes to shearing forces of superior vertebrae.

Quadratus Lumborum (QL): Bilateral support wall or stabilizer for the lumbar spine. The QL is active during flexion, extension, and lateral bending of the spine and maybe one of the few muscles that doesn’t turn off during the flexion/relaxation phenomenon.
Psoas: Major hip flexor. May assist in some stabilization due to its orientation (Origin is T12-L5).



Core Stabilization Mechanisms: Abdominal Hollowing vs. Abdominal Bracing
Abdominal Hollowing
The abdominal hollowing technique was essentially developed from a group of Australian sport scientists (Richardson et al. 1999). This “Queensland group” determined that the transverse abdiminis (TA) and multifidus (MT) muscles in particular, were very important muscles for motor patterning. They found that following injury to the back, the TA and MT underwent motor disturbances that had profound effects on the motor patterning of the body. Because further injury would just add to these effects leading to a chronic state of poor patterning and pain, the Queensland group argued that only specific abdominal activation techniques could break this poor programming. Thus was born the abdominal hollowing technique: This technique involves the drawing in of the abdomen in an attempt to isolate the TA, while relaxing the surrounding musculature (RA, IO, EO).

Abdominal Bracing
The abdominal bracing technique was primarily developed - or more appropriately, coined - by Canadian biomechanist Stuart McGill. This technique involves the co-activation of all the muscles surrounding the spine (RA, IO, EO, TA, MT, Latissimus, QL, and the extensors) in an attempt to create 360 degrees of stability. While bracing, the individual doesn’t draw in or push out, but rather “braces” or widens the trunk. If you think about what you would do if someone was to punch you in the stomach: You would set or brace for the punch and effectively create stability all the way around the spine. (For more on abdominal bracing, see Ultimate Back Fitness & Performance by Stuart McGill).

To Brace or Hollow: That is the question
Much of the data that came out of the Queensland research was misinterpreted. Because they were working with injured individuals with malfunctioning motor patterns, the techniques they came up with were an attempt to disrupt the faulty patterns and educate the patients on abdominal control. Moreover, the TA anticipates trunk, upper and lower limb movement as well as protects the spine (Hodges, 1999). This anticipatory and protective function can be lost with acute or chronic low back pain. However, many clinicians took this information and regarded the techniques as a way of creating optimal core stability during various tasks. Thus, abdominal hollowing seems to be the preferred choice of many physiotherapists, strength coaches, chiropractors and kinesiologists for core stabilization.
Enter Stuart McGill! Not dismissing the importance of these muscles in their role as intra-abdominal pressure creators and stabilizers, McGill and others have since argued that this is simply not enough to endure tasks of even moderate intensity. Furthermore, during athletic events, unpredictable forces from all directions occur in almost any sport. Specifically, if a posterior perturbation – or unsuspected push from behind - occurs on the spine (lets say a defensive stiff-arm as you lean into a defender in basketball), abdominal hollowing produces the same resistance to the force that no activation does and results in an increase in spinal flexion (vs. 43% reduction of spinal flexion when bracing is used) (Vera-Garcia et al. 2007). As kettlebell lifter and educator Brett Jones says, if you took a cardboard box on its side and loaded it from the top, the box would crumble. Just ask Human Motion’s Cliff Harvey what would have happened if he drew his stomach in while attempting world record lifts in weightlifting: He too would have crumbled. Furthermore, it is almost certain that if you try to contract only the TA, you will have activity in the IO and EO as well.
When the muscles surrounding the spine co-contract, they create a stiffness that is greater than the sum of the individual muscle stiffness (McGill, 2006). Thus, during the hollowing procedure, you are actually inhibiting the potential for optimal stiffness, ultimately limiting performance. You would think that in order to brace properly and ensure “superstiffness” that you would need to have an all out contraction during most activities. However, this doesn’t seem to be the case as the first 25% of a maximal abdominal contraction creates sufficient stiffness for most activities (Brown & McGill, 2005). During 1RM lifts such as Cliff’s world record attempts however, a maximum voluntary contraction (MVC) of all the surrounding musculature is necessary to withstand the massive force.

Let’s hug it out: We are dealing with apples and oranges
There seems to be a lack of understanding as to the different techniques used between physios and strength coaches for core stabilization and activation. When a patient is seeing a physio, they are exactly that – a patient. Most of the time they are coming from an injury and have consequently obtained faulty patterns within their muscle sequencing. On the other hand, they could have had years of overuse injuries or poor gait biomechanics that has led to muscular imbalances. Thus, abdominal hollowing seems to be the technique of choice to help create that control that probably was never there even before the “injury” brought them to rehab. THIS IS PERFECTLY FINE. This is our group of apples. Our group of oranges are either these same patients coming from physio or our uninjured group of individuals who need to get stronger. Once these individuals are able to withstand heavier forces and are loaded up with weights, abdominal hollowing is no longer sufficient to lift this kind of weight, while sparing the spine. Thus, the abdominal brace must be taught. Herein lies the problem. We are constantly nagging each other (various health care practitioners) about the different techniques used. We need to remember that it is the needs of the client/patient that is our primary concern. WE NEED TO EDUCATE AND PREPARE THEM FOR THE NEXT STEP. Physios: Inform the patient that if they are an athlete or they are going to be lifting weights in the future, they will have to learn both techniques. Strength coaches: Actually integrate both techniques into your training. Isolate then integrate. It is a great way to allow the client to achieve initial success (abdominal hollowing) and then allow them to see the big picture of lifting heavier loads (abdominal bracing).
An integrated team approach can produce great success for the athlete, however, all members need to be on the same page even if their philosophies differ. Work with each other to produce the best results for the client/patient. Your athlete will ultimately be stronger, safer, and less confused in the process!

References
Brown, & McGill . (2005). Muscle force–stiffness characteristics influence joint stability: A spine example. Clinical Biomechanics, 20(9), 917.
Henke, Sharratt, Pegelow, & Dempsey, (1988). Regulation of end-expiratory lung volume during exercise. Journal of Applied Physiology, 64(1), 135.
Hodges (1999). Is there a role for transversus abdominis in lumbo-pelvic stability? Manual Therapy, 4(2), 74.
Juker, Mcgill, & Kropf, (1998). Quantitative intramuscular myoelectric activity of lumbar portions of psoas and the abdominal wall during a wide variety of tasks. Medicine and Science in Sports and Exercise, 30(2), 301.
Lehman & McGill, (2001). Quantification of the differences in electromyographic activity magnitude between the upper and lower portions of the rectus abdominis muscle during selected trunk exercises. Physical Therapy, 81(5), 1096.
McGill, (1991a). Electromyographic activity of the abdominal and low back musculature during the generation of isometric and dynamic axial trunk torque: Implications for lumbar mechanics. Journal of Orthopaedic Research, 9(1), 91.
McGill, (1991b). Kinetic potential of the lumbar trunk musculature about three orthogonal orthopaedic axes in extreme postures. Spine, 16(7), 809.
McGill, (1992). A myoelectrically based dynamic 3-D model to predict loads on lumbar spine tissues during lateral bending. Journal of Biomechanics, 25(4): 395.
McGill, (2006). Ultimate back fitness and performance. Waterloo, ON: Backfitpro Inc.
Nitz & Peck, (1986). Comparison of muscle spindle concentrations in large and small human epaxial muscles acting in parallel combinations. The American Surgeon, 52(5), 273.
Richardson, Jull, Hodges, & Hides, (1999). Therapeutic exercise for spinal segmental stabilization in low back pain. Edinburgh, Scotland: Chruchill Livingstone.
Vera-Garcia, Elvira, Brown, & McGill (2007). Effects of abdominal stabilization maneuvers on the control of spine motion and stability
against sudden trunk perturbations. Journal of Electromyography and Kinesiology, 17(5), 556.

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