Client Success Story – Dan

Name: Dan
Age: 33
Height: 5′ 10″

Dan’s Training Program
Dan came to me with no formal training history. He had never even done certain basic barbell lifts (squat, deadlift). His major goals were to get instruction in proper form for the barbell lifts and to get a bit stronger. However, he presented with an added complication of constantly suffering from back pain. With no prior history of injury or serious training, I suspected the pain would disappear as he strengthened his back with proper technique.

Duration of Training
One 9-Week Cycle based on the Starting Strength methodology.
 
 
 
 
 
Before & After Statistics
 
Starting Weight: 150
Ending Weight: 165
 
Starting Weight for Lifts (lbs):
Squat 95x5x3 (with difficulty keeping knees out), Press 65×5×3, Bench Press 105x5x3, Deadlift 110×5 (with difficulty setting back and regular back pain), Power Clean 65×3×5
 
Ending Weight for Lifts (lbs):
Squat 165×5, Press 90×5, Bench Press 145x5x3, Deadlift 180×5 (with no more back pain), Power Clean 100×3×5


In His Own Words
 
One day I was fed up with being unhealthy and decided to make a change. I joined a gym and found a 5 day split weightlifting program. I was committed and didn’t miss a day at the gym for the first two months. I felt much better but I wasn’t making any progress. My weight remained flat at 150lbs and I wasn’t getting stronger.

I did some research and discovered the Starting Strength Program. I really liked the linear progression model but I was hesitant for safety reasons. I had constant lower back pain and was afraid that lifting heavy free weights might make it worse. That’s when I decided to train with Hayden so I could learn proper technique and minimize risk of injury.

I had never done a squat or deadlift in my life. Hayden took the time to teach me proper technique and ensure that I didn’t injure my back. The results were better than I expected. Over the course of 9 weeks I gained 15 lbs, mastered the major lifts and changed my lifestyle. The best part about it was that my lower back pain completely disappeared. I tried so many different remedies including acupuncture, chiropractors, massage and stretching but nothing helped. Once I strengthened my back, my posture changed and now I’m pain free.

Starting strength was a great program for beginners and I would highly recommend Hayden as an instructor. He is very knowledgeable and professional.

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Metcon Strong – Free Programming for Conditioning

A great deal of the programming I do for my clients, and for myself personally, has a bias towards strength. The primary reasons are as follows: 1) Strength is a general adaptation and its development improves a number of physical attributes and skill sets (Power, Coordination, Balance, etc.). So if you want to get better at life, getting stronger is the best place to start. 2) As humans age we lose bone and muscle mass which leads to numerous chronic conditions later in life. The stronger we are, the less these musculoskeletal issues affect us, and the greater our quality of life.
 
I am a big believer that a base level of metabolic conditioning (cardiovascular endurance) is necessary for optimal strength training, but if a strength-biased program is undertaken, the incorporation of conditioning must be done carefully, particularly if one is new to training. During training we must always manage the stress we impose and how we recover from that stress. Therefore, if our conditioning imposes too much stress on our body, we may not be able to recover in time for our next strength training session. And that means no gains.

Conditioning can be dialed in at manageable stress levels fairly easily if we stick to monostructural activities like rowing, biking, and sled pulls/pushes. However, this type of training can get monotonous, particularly for individuals who have done more varied types of conditioning in the past. Consequently, I have decided to launch a programming series named “Metcon Strong” which will highlight conditioning pieces I find or create that can be done with minimal to no negative consequences on one’s strength training.

These pieces of programming can be found on my Science for Fitness Instagram account (@scienceforfitness) and will be posted several times a week. They can also be viewed in bulk by searching for the Instagram hashtag #metconstrong. Feel free to try them out if you want to add some conditioning to your program, but before you do, please keep the following in mind:

  • It should go without saying that if you are not eating and sleeping enough to conduct your strength training program with optimum results, adding conditioning is going to be an even rougher haul. If you have these kinds of issues, it’s probably better to omit conditioning. Similarly, if you are brand new to strength training and/or embarking on a linear progression, especially with little to no familiarity with the lifts, conditioning will likely be too much of a stressor to combine with your strength training.
  • Ideally, your Metcon Strong conditioning should be done on your strength training days after your strength training. This leaves your rest days as rest. Remember, you don’t get strong by lifting weights, you get strong by recovering from lifting weights.
  • The Metcon Strong programming pieces will invariably be very light for weighted movements. Remember, the idea is that you are doing serious strength work at least 3 times a week, so adding heavy weights to your conditioning would be counterproductive.
  • For the most part this programming series will have no running. I feel the risk is a little bit too high. A bad step and you could twist something, setting your strength training back quite a bit. Further, the eccentric component to running is substantial and this can make recovery hard to manage.
  • For EMOMs, I recommend doing a test round to see if you’re being left with enough rest to complete the full EMOM. If not (remember fatigue will creep in as the rounds progress), scale the number of reps and/or rounds down to something you can manage.
  • Some programming may not be appropriate for certain days of your training or may not be appropriate at all. For example, completing a conditioning piece with Wall Balls two days before your heavy squat (Intensity) day likely won’t allow you enough time to recover. Further, you may find that certain movements you can’t really recover from at all. Make the changes you need as you discover more about how your body responds.
  • Be extra careful with conditioning that uses your shoulders or triceps. These muscles are smaller than your leg and back muscles and tend to be more sensitive to overtraining.

Finally, remember that I do not know what strength programming you are doing, nor what level of conditioning you have. So, you may need to adjust the Metcon Strong programming in other ways. This is fine. The best programming is always that which is tailored to the individual, so make modifications as needed.

If you have any questions, feel free to drop me a line.

~Hayden

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Client Success Story – Walt

Name: Walt
Age: 46
Height: 6′

Walt’s Training Program
Walt had significant mobility and range of motion restrictions when he came to me. He wanted to improve his movement patterns and get stronger. As a Master’s Athlete, some modifications to his programming were necessary, but I still began him using a Starting Strength linear progression in my Solace Strong class. He took three 8-week cycles with me, each interspersed with periods of CrossFit classes. I modified his strength programming as he progressed through each cycle to permit continued progress.

Duration of Training
Three 8-week Cycles.
 
 
 
 
 
 
Before & After Statistics
 
Starting Weight for Lifts (lbs):
Squat 135×5 (with depth issues), Press 85×5 (with significant shoulder flexibility limitations), Bench Press 145×5 (with R/L arm imbalances), Deadlift 165×5 (with difficulty setting back tight), Power Clean 85×3
 
Ending Weight for Lifts (lbs):
Squat 225x5x3 (1RM = 260), Press 130×5 (1RM = 150), Bench Press 185×5, Deadlift 265×5 (1RM = 345), Power Clean 135×3


In His Own Words
“For years, I would spend time lifting weights at the globo gyms. For years, nothing really changed. Not from my body perspective; not from my strength perspective. One day, I looked around at all of the people who were in the locker room and they all looked the same. And always have. I realized that I needed to change whatever it was that I was doing.

Back in May of 2015, I walked into Solace and started to do CrossFit. By September of 2015, I committed to it full-time. Only at that time did I find out just how weak my legs were and how incorrectly I had been lifting weights all this time. I spoke to Coach Hayden about Starting Strength and signed up for my first cycle in October of 2015.

The first time that Hayden saw me squat, I thought he was going to faint on the spot or kick me out of the program. Whatever I was doing was THAT bad. But he did not quite faint. Or kick me out. Hayden very patiently worked with me on my squatting. His pointers and vigilance to the program and what needs to be tweaked in the program resulted in my squatting properly for the first time in my life. But not only that, much to my amazement, my numbers began going up. I was lifting more and more. Not only on squats, but with the other lifts. I was suddenly deadlifting, bench pressing and pressing correctly. I was now also doing a more dynamic lift such as the power clean.

After my initial strength cycle, I returned to CrossFit and was amazed at what a difference the extra strength made. I have now done 3 such cycles, all with Coach Hayden overseeing me. His attention to detail and not allowing me to slack off has paid off in that I can now lift heavier weights than I ever have in my life. All of this, helps me on the other side of the floor with CrossFit. I have committed to several such strength cycles per year. Thanks to Hayden, my goals for what I can lift keep increasing.”



Walt achieving a new 1RM in the Press and Deadlift on 12-18-16.

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The NY Times’ Discussion on “Too Much” Dietary Protein

The New York Times recently posted an article which leans heavily towards the notion that people are now consuming protein at levels that are not healthy or safe. As is customary for New York Times health and science pieces, this article is full of oversimplifications, selective interpretations and omissions. Below is my brief takehome summary of the article, followed by specific article statements (in bold) and my responses (plain text).

The Takehome: This NY Times article largely tries to make a case for there being too much protein in people’s diets and also that these high levels of protein are unhealthy. This type of slant for an article is a disservice to the public because it is known that too much of any macronutrient can be unhealthy for a variety of reasons. What would be helpful is knowing how much protein exactly is too much for specific types of individuals. Of course, this is where research falls short and where this article turns a blind eye. We don’t have enough science controlling for individual factors and protein intake, but we know for a fact that significant muscle mass is lost in aging and higher than daily recommended allowances of protein are essential when exercising. Further, protein is expensive. So, odds are, too much protein is likely not massive societal problem (certainly not compared to the over-consumption of sugar). Indeed, most of the clients I train come to me very thin/frail and eating very little protein.

Specific Article Statements:

1. “The vast majority of Americans already get more than the recommended daily amounts of protein from food…and there are no rigorous long-term studies to tell us how much protein is too much.”

Recommended daily amounts of protein are notoriously vague. They don’t take into account age, sex, current lean mass, activity level, or target lean mass (if trying to gain muscle). As far as long-term studies are concerned, there are very few of these that exist for anything. Regardless of the factor being studied (food, supplements, drugs), it’s very hard to conduct long-term studies. If you only plan to consume products that have long-term studies backing their safety, you’re going to have a hard-time finding things to eat.
 
2. “You can eat 300 grams of protein a day, but that doesn’t mean you’ll put on more muscle than someone who takes in 120 grams a day,” Mr. White said. Meanwhile, “you’re robbing yourself of other macronutrients that the body needs, like whole grains, fats, and fruits and vegetables.”

You’re only robbing yourself of other macronutrients if you are reducing your intake of those other macronutrients. Just because an individual increases the amount of protein in their diet, doesn’t mean they are reducing the levels of other macronutrients. This has to be examined on a case-by-case basis.
 
3. “…a recent small trial found that older women who lost weight on a high protein diet did not experience one of the important benefits that usually follow weight loss, an improvement in insulin sensitivity, which reduces the risk of developing Type 2 diabetes.”

The study cited found this phenomenon in older obese women who were given a hypocaloric diet. That is, they tested high protein in women who were eating low calorie diets to lose weight. So, they were mixing two variables, caloric restriction and high protein. They do not separate out these effects. And of course, for those not overweight, this study does not have relevance.
 
4. “Large population studies also suggest an association between habitual high protein intake and a heightened risk of diabetes.”

The NY Times doesn’t give citations for these studies, so this doesn’t help clarify anything.
 
5. “Doctors also have concerns about the long-term effects of maintaining a high protein diet. Studies show that protein-rich diets do not preserve muscle mass over the long term, and doctors have long cautioned that a high-protein diet can lead to kidney damage in those who harbor silent kidney disease by putting extra strain on the kidneys.”

Again studies here are not cited. To the next point, yes certain doctors have concerns, but these concerns are only loosely based on science. High protein is a potential issue for individuals who have kidney problems – a special case scenario. If we’re going to take the stance of cautioning everyone away from “high” protein because they might harbor a silent disease…well, this just isn’t being done for the millions of other potentially hidden diseases/conditions that may be exacerbated by dietary factors. This just isn’t how medicine works.
 
6. “Furthermore, some researchers worry that the muscle building properties that consumers seek in protein may be a double-edged sword, perhaps even leading to an increased risk of cancer.”

This is a possibility (based largely on animal and cell culture studies), but we need more data. We need to better understand in what populations and in what doses this phenomenon may exist.
 
7. “Several large observational studies have linked high-protein diets with an increased incidence of cancer, heart disease and other ills. One study led by Valter Longo, the director of the Longevity Institute at the University of Southern California in Los Angeles, followed a nationally representative sample of 6,381 adults. It found that those who ate a high protein diet between the ages of 50 and 65 were four times more likely to die of cancer than those who consumed less protein.”

Yes, but the author of this NY Times article conveniently leaves out other data from this same study which indicate that high protein intake was associated with reduced cancer and reduced overall mortality in respondents over 65 years old. So, again, the data is not yet clear.
 
8. “Consumer groups have warned about the potential contamination of protein products, which are categorized as dietary supplements and loosely regulated. A Consumer Reports test of 15 protein powders and drinks in 2010, for example, found arsenic, lead, cadmium and mercury in some of the products tested.”

These metals are found of lots of foods in trace amounts. Were the levels found excessively high? Again, citations are not given for this study. The lack of regulation of supplements is a legitimate concern (as I’ve discussed previously), but there are good quality protein supplements out there which are tested for purity by independent third parties. So, this concern can be mitigated.
 
9. “‘Nothing beats real food,’ Mr. White said.”

Finally, a statement I agree with. The bulk of your protein should come from meals, but if you’re someone who is having trouble getting enough protein on a daily basis, supplementation is something I would recommend. Consuming 1g of protein per lb of body weight (or target body weight if trying to gain muscle) daily is a general guideline that continues to work very well to this day.

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Using Skulpt Chisel for Body Composition Measurement

skulpt-chisel

For many people, reaching their health and fitness goals means reducing their body fat or gaining muscle mass. In all likelihood, there is greater interest in the former. So, what’s the best way to go about measuring it? The major ways to measure body fat percentage are as follows:

1. Visual Changes: Look at your body over time.
2. Skin Calipers: Use measurement calipers to measure “pinch-able” fat at different locations of your body.
3. DEXA: X-ray beams are used to assess lean and fat mass.
4. Hydrostatic Weighing: Body fat composition determined from your dry weight and weight when submerged in water.
5. Air-Displacement Plethysmography: Similar to hydrostatic weighing, but using air displacement instead.
6. Electrical Impedance: Using tiny electrical impulses to measure signal return rates, which are specific to different tissues.

There are drawbacks to each of the above. Visual changes can be hard to see if you are losing small amounts of fat mass or if the fat is being reduced more heavily in certain body parts than others. Skin calipers have a fair bit of user error and can only take measurements from certain body parts (not necessarily the ones where you have most of your body fat). DEXA, Hydrostatic Weighing and Air-Displacement Plethysmography have the major drawback of being expensive.

Given the above, I tried to settle on a method that I would regularly use to assess body fat on myself (I do a lot of experimenting with training programs and nutrition plans). I started with Hydrostatic Weighing at a time when I was carrying the most fat (May 2015) and the results told me I had 9.5% body fat. I don’t have a picture from that time, but it really didn’t make sense. Hydrostatic Weighing is often considered a gold standard because the science behind it is robust. However executing the technique is somewhat tricky as user/subject error can skew the results. Indeed, something must have went wrong. Perhaps I didn’t expel enough air when under the water. Perhaps it wasn’t calibrated right. Whatever the reason I knew I had to be around 13-15% fat and I didn’t want to keep spending money to sort it out.

Instead, I backed the Skulpt Chisel on Kickstarter which uses electrical impedance. Typical electrical impedance devices (which are generally scales) send a signal through your entire body and read the signal once it returns…after having taken the shortest route to get there. Thus, these devices are susceptible to changes in body hydration, how fed you are, etc. The devices also base their calculation on how tall you are, how much you weigh, and so on. The Skulpt Chisel doesn’t make these kinds of estimations. It sends and receives its signals locally as they passes through specific parts of your body (biceps, thigh, abdominals). Thus, the signals pass through the muscle and the fat of your area of interest. Comparisons made by the Skulpt Chisel team demonstrated that the Chisel was 5 times more accurate than regular impedance scales and deviated from DEXA measurements (the more expensive gold standard) by less than 1.5%.

For my interests, I wasn’t that concerned with absolute accuracy. I wanted a device with accuracy for sure, but I wanted one that could track changes (sometimes small ones) consistently over time. So, once my device came, I decided to try it out. Here’s how it went:

Age: 38
Testing Period: April 2016 to October 2016 (6 months)
Training Regimen: 5 days per week. CrossFit and High Intensity Conditioning classes with some supplemental maintenance strength training on the side.
Nutrition: Not regulated. A handful of meals each day were Paleo, others were not. However, I knew based on prior information that the calories and macronutrients I was consuming were appropriate for me to lose fat.
Visual Changes:

April 2016

8-22-15-gymselfie-edit
October 2016

img_4742-edit
As you can see, I was reasonably lean when I started the experiment, but managed to get even leaner by the end. The reduction in fat mass was therefore not major, but that’s exactly what I wanted to experiment with; I wanted to see how well the Skulpt Chisel would pick up on a relatively small change. Below I highlight the specific data the Skulpt Chisel gave me.
img_3969-edit summary-edit
Note that the graphs above are a bit different do to a change in software version that happened during my experiment. You can see that my body fat percentage dropped from 14.7% to 12.1%. Note the starting body fat percentage of 14.7% made much more sense than the 9.5% that hydrostatic testing gave me (which was measured when I was carrying even more fat than I am in the picture shown on the left).
 
Shown above is also a readout for muscle quality. Skulpt Chisel measures this based on the fact that higher quality muscles will have less stored fat and, if bigger, will demonstrate greater electrical charge storage capacity and greater time delays as the signal returns. I wasn’t too concerned about this measurement given that my muscle size (visual appearance) and how much weight I can lift is what’s most important to me, but it’s a nice feature to have.
 
To close, I want to highlight what I really love about the Skulpt Chisel and that is how you can get a readout of your body fat percentage in specific areas of you body. This is crucial because 1) most of us want to look leaner in a specific area (i.e., Abdominals) and 2) our bodies tend to collect more fat in certain areas than others. For me I tend to carry more weight in my abdominal region and my buttocks (over my gluteal muscles). Of the two it’s my glutes that carry the most fat by far. So, did the Skulpt Chisel pick this up?
img_3972-edit fat-back-edit
Again, the summary figures above look a bit different due to the software versions, but you can see quite clearly a large amount of fat in my Glutes at the start (21.8%, 24%) which is then reduced, but still somewhat high at the end (13.5%, 14.3%). So, yes, the Skulpt Chisel picked up on this key site-specific difference and its change over time.


So there you have it. The Skulpt Chisel can be purchased for $99. It interfaces with your smart phone, so that’s all you need. Given the information offered by the device and how reasonable the price is, I can’t recommend it enough. I’ve been recommending this device to all my clients that are serious about tracking their body composition changes, so if you too are interested in the information it has to offer, check it out.

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Political Awareness: My Promise to Do More

Years ago a friend of mine engaged me in a conversation about politics and I didn’t really have anything to add. He asked me why I wasn’t keeping up with things in the world and I responded by reminding him I’m a “science guy.” There’s only so much time I can commit to things each day and US politics doesn’t really affect me – it’s a “separate subject.” Over the years I began to realize that not only was the media misrepresenting and misunderstanding science, but so were elected government officials. One reason for these missteps was simply because so few scientists are actually in government. I made note of this in my mind, but moved on with my work.

When the 2013 US budget sequestration hit, it became very apparent that government can have massive effects on science, health & medicine. Grant funding for research dried up, senior faculty around the country had to retire early and young investigators couldn’t get jobs because colleges, universities and medical institutions went on a hiring freeze. Still, the takehome for me was that government was very important to research funding and I left it at that. Over the course of the past 5 years, though, we have see science, health and medicine feature prominently in the political arena. Laws concerning food safety, taxation of sugary drinks, genetic manipulation of produce, and health effects of natural gas mining are just some examples. The world is growing and issues are starting to hit closer to home.

The results of this year’s national election, which resulted in both a Republican President and Republican-controlled congress, shocked a large portion of the nation and will likely result in major policy changes towards areas such as medical care and environmental health/safety. It is my experience that whenever one is shocked by an outcome, it indicates a lack of awareness. Americans are now realizing that they were “asleep” with respect to the interests, priorities, and values of a great many other Americans. I realized I was too and I decided I needed to do more.

Aside from being more engaged locally, I realized that through Science for Fitness I can reach a wider audience. The results of the most recent election offer a number of arenas where Americans need to stay vigilant and work to affect change, but Health & Medicine are the areas that I will address through the reach of Science for Fitness. As always, my primary goal is to educate and increase awareness. In order for us to affect change or prevent unwanted change, we all must be aware of issues coming to the forefront.

Below is a summary of what you can expect from me going forward.

On Key Matters Pertaining to Health & Medicine:
1) I will give updates and information regarding government investigations, referendums, court rulings, laws, etc.
2) I will give reminders as election seasons approach and highlight key ballot measures across the country.
3) I will not tell my readers/followers how they should vote.

#3 is important. I try and minimize subjectivity as much as possible through Science for Fitness and these additions will be no different. Some may say that in the political arena I should advocate my particular opinion, but that really isn’t what this site is about. Ultimately, a voter’s decision will be based on the sum total of issues that are most important to them. Engaging them in that discussion detracts from my mission to educate.

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Client Success Story – Grant

Name: Grant
Age: 38
Height: 6′

Grant’s Training Program
I trained Grant using a Starting Strength Linear Progression in my Solace Strong class at Solace New York. This enabled him to get stronger and gain lean mass. In addition, Grant wanted to not gain unnecessary fat during the training program, so I gave him a one-time nutrition consult with recommendations for calories, macros and supplement use.

Although not always possible for every client, given Grant’s starting statistics and his dedication to training, nutrition, and recovery I was able to give him a program where he was able to gain lean mass and reduce his body fat percentage at the same time.

Duration of Training
9 weeks
 
 
Before & After Statistics
 
Body Weight Before: 186 lbs
Body Weight After: 191.5 lbs (+5.5lbs)

Body Fat Before: 19.4%
Body Fat After: 16.7% (-2.7%)

Starting Weight for Lifts (lbs):
Squat 135×5, Press 70×5, Bench Press 160×5, Deadlift 195×5, Power Clean 125×3
Ending Weight for Lifts (lbs):
Squat 220×5, Press 100×5, Bench Press 182.5×5, Deadlift 255×5, Power Clean 155×2


In His Own Words
“Around 5 years, I weighed about 186 pounds but my body fat was close to 30%, so at 6’ft I was quintessential “skinny-fat.” My main goal was always about performance and energy. I took some classes, had one trainer and did some weight-lifting. My training was sporadic and without a philosophy. In Q1 of 2016, a friend of mine told me about this regime called Starting Strength. He actually called it the “bible” for weight-lifting. The first thing that I noticed was the process – for anyone looking for a very processed oriented training regime, this is your ticket. I am definitely not an autodidact, and tend to be more of a kinesthetic learner, so I knew I needed a pro. My goal with starting strength was to learn the movements and get strong (as opposed to look good/strong). After speaking with Coach Hayden, it was clear that the technical side and process side was important, but the “diet” was just as important. So after getting a diagnostic test from him, my goal changed from getting stronger to getting bigger (and stronger). I went from roughly 186 to 192lbs over 9 weeks and actually dropped some body fat (roughly 2%). My next goal is to hit 200lbs and stay around 17% body fat.”


Grant deadlifting during his 9 week strength cycle.

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Do Consecutive Days of CrossFit Increase Inflammation?

A recent study of CrossFit training and inflammation by Tibana et al., 2015 was summarized by the media and the takehome message was two consecutive days of CrossFit training will suppress your immune system. This is a serious claim. We therefore have to ask if the actual study supports this phenomenon.

The Takehome: Even if we put the media’s interpretation of this study aside, the authors themselves do not interpret their data quite right. First, they look at IL-6 levels as a pro-inflammatory molecule. But it can also be anti-inflammatory (the anti-inflammatory action of IL-6 is in part due to inhibition of TNF-alpha and IL-1). The authors can’t tell in which capacity it is acting, so any changes they see are hard to interpret. Regardless, IL-6 levels return to baseline 24 hours after 1 WOD and also 24 hours after the 2nd day’s WOD. So, there is no elevation of IL-6 unique to doing 2 WODs on consecutive days. Similarly IL-10 which is pro-inflammatory did not even increase significantly after the 2nd day’s WOD. So, this study does not show an increase in inflammation that is unique to CrossFit WODs done on consecutive days. I should also note that a study like this, looking at only a few markers of inflammation, could never show “immune system suppression.” Beyond this, the immune system works in such a way that both reduced and increase activity can be beneficial depending on the specific location in the body. For example, we have a lot of evidence which supports a need for increased inflammation at sites of tissue growth and repair. Thus, even if a study were to show cumulative increases inflammation in CrossFitters during training (which this one does not), those increases may necessary in order to become more fit.

STUDY DETAILS
Experimental Design:

  • 2 training days were administered. Each began with a Olympic lifting segment, followed by a Gymnastics segment, and finished with a metabolic conditioning piece in the form of an AMRAP (as many rounds and reps as possible).
  • 9 CrossFitters were recruited (mean age of 26). They each had a minimum of 6 months of CrossFit Training.
  • A variety of markers were measured in blood including lactate, glucose, IL-10, IL-6.
  • Muscular power output during a back squat (5 reps at 50% of 1 repetition maximum) was also measured during each session using a linear position transducer.

Results:
Note: IL-6 is a pro-inflammatory cytokine (promotes inflammation) when secreted by immune cells, but it can also be anti-inflammatory (reduce inflammation) when secreted by muscle cells. IL-10 is a pro-inflammatory cytokine. The authors of the study do not clarify what specific effect IL-6 is having during training, so meaningfully interpreting the results below is not easily done:

  • Immediately after WOD 1 and WOD 2, IL-6 increased significantly from baseline.
  • 24 hours after both WOD 1 and WOD 2 IL-6 levels were no longer significantly elevated.
  • Immediately after WOD 1, IL-10 increased significantly from baseline. IL-10 did not increase significantly after WOD 2.
  • 24 hours after WOD 1, IL-10 levels were not significantly different from baseline.
  • IL-10/IL-6 ratio decreased significantly after WOD 2 when compared to WOD 1, but again what does this mean when IL-6 can be pro- or anti-inflammatory?
  • OPG concentration 48 hours after WOD 2 was significantly lower than before WOD 1, but no different from levels post-WOD 1 or immediately post-WOD 2.
  • Mean change from baseline data was reported, but see limitations below on this.
  • Peak power was significantly higher after WOD 2 than before WOD 1.

Limitations:

  • A minimum of 6 months isn’t very specific. A participant with 6 months experience versus 6 years of experience will likely respond very differently to the WODs.
  • Similarly, we don’t know how hard each participant executed the WODs. A score for the AMRAP and/or an RPE (rating of perceived exertion) would help confirm uniformity of the results.
  • Although many CrossFit classes are composed of multiple pieces before the metabolic conditioning, this is not always the case. In fact, optimal CrossFit programming as espoused by the Founder, would, on days where there is metabolic conditioning, only have skill work beforehand, or nothing at all. The training sessions in this study are of higher volume.
  • The authors are not able to distinguish if IL-6 is being produced by immune cells (pro-inflammatory) or muscle cells (anti-inflammatory).
  • OPG is not a pure inflammatory molecule. It is also a signaling molecule involved in bone formation and repair and both low and high levels can be beneficial depending on the circumstance. The authors do not show how OPG is actually acting in this study.
  • Statistically analyzing “mean change from baseline” data for cytokines when the individual values for those post-WOD data points were not different from the baseline is not a meaningful analysis.
  • There were no female participants in this study.
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Interview on Anabolic Co

I was recently interviewed by Anabolic Co as part of their Personal Trainer Showcase series. I talk about my background and my philosophy on training. Click the image below to read the full interview.


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Science For Fitness On Two More Top Blog Lists for 2016

Science for Fitness made it onto two more Top Fitness Blogs of 2016:
 


 
The first list was created by Feedspot. Click the image below to see the full list and the write-up on my blog (Number 60 in the list).

The second list was created by Empowered Health & Fitness. Click the image below to see the full list and the write-up on my blog (6th entry down in the list).
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