SLAP Tears

slap tear anatomy shoulder

What’s up ? This is THE stephane ANDRE. With my training, I’m interested in biomechanics to avoid injuries. I read « Sport Medicine Media Guide » and I learned some good stuff.

SLAP is an acronym for superior labrum anterior to posterior. The labrum is a rim of tissue that adds depth to the bony socket of the shoulder. The superior or « top » portion or the labrum is important and frequently injured because the biceps attaches to this region.

How

SLAP tears happens because of physical activity with repetitive overhead movements or physical shock. Tears created because of overhead movements are common among athletes as basball pitchers or tennis players. Tears created due to physical shocks are often a fall on a hand stretched with the arm over the head or fall directly on the shoulder.

Diagnosis

slap tear anatomy shoulder

SLAP tears are very difficult to diagnose only with a physical exam because of different shoulder problems. Using a MRI with or without contrast helps a lot.

Treatment

The first step is to do a nonsurgical treatment. While the SLAP tear likely will not heal, a study confirmed that many have improvement of symptoms and function. If nonsurgical treatment (such as physical therapy) isn’t successful, surgery is being considered.

Surgery is usually done arthroscopically and involves reattaching the torn labrum to the top of the cavity. Generally, bone anchors loaded with sutures are inserted into the top of the cavity. The sutures are passed through the torn area of the labrum. The sutures are tied, which brings the torn labrum to the bone.

Prevention

Although it’s difficult to avoir acute SLAP tears, it’s possible to prevent chronic tears, especially with athletes who make overhead movements, maintaining balance in the shoulder.

Exercices that strengthen the muscles around the shoulder blades and exercises that stretch posterior shoulders are recommended to reduce the risk of SLAP chronic tears.

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-Steph

P.S. If you’re in Miami and you like Caribbean food, go to my cousin’s bistro to eat Haitian food, click here .

Manage Your Amino Acids

amino acids

What’s up ? This is THE stephane ANDRE !!! I watched a Jamcore DZ’s video  and I learned some good stuff.

To put it simply, protein is an assembly of amino acids which means that you have to eat protein so that your body can have amino acids. There are a total 20 amino acids, 8 are essential and 12 nonessential. Be careful, nonessential amino acids are also needed. When you see an amino acid with the word « star », it means that it’s an important amino acid to be in shape.

What we call essential amino acids are those that our body doesn’t not produce. That’s why you have to look for them from an outside source. This outside source is the food you eat in the form of meat, egg, fish, dairy product, etc. And it’s possible that the outside source is whey protein powder in concentrate, isolate or hydrolyzate form.

Each amino acid has one or more important functions that’s why I’m only going to talk about important functions to be in shape.

amino acids table

Essential amino acids

Here are the 8 amino acids :

Lysine

This amino acid transports calcium to your body and reduces the tryglycerin’s rate.

Isoleucine, Leucine and Valine are BCAA (amino acids star)

These 3 amino acids have the function of giving energy, repair muscle tissue, anticatabolic, helps in congestion (pump) and helps burn fat.

Methionine

This amino acid is an antioxidant, helps in burning fat in the liver.

Threonine

This amino acid creates elastin and collagen, it’s for the skin. This is beneficial for slowing down old age.

Phenylananine

This amino acid increases alertness.

Tryptophane (amino acids star)

This amino acid reduces appetite and promotes sleep. It’s also a precursor of serotonin, that is to say gives you a good mood.

Nonessential amino acids

Here are the 12 amino acids :

Histidine

This amino acid helps recovery and growth.

Arginine (amino acids star)

This amino acid is the Viagra of amino acids. It’s also the precursor of nitric oxide which helps with congestion.

Glutamine (amino acids star)

This amino acid helps to be focus, to have more energy and helps with recovery.

Aspartic acid

This amino acid increases testosterone but is not definitive. There has been a lot of scientific studies concerning this amino acid but unfortunately, it has not been 100% proven that aspartic acid naturally increases testosterone. This is why it’s interesting to read the latest scientific studies on amino acids because we’ll discover new things.

Gutamic acid

This amino acid is a neurotransmitter and it’s also used as a fuel of the brain.

Cysteine

This amino acid a detoxifier for the liver, fat burner and antioxidant.

Ornithine (amino acids star)

This amino acid derived from arginine. It increases your growth hormone, increases your sleep and gives you more vitality.

Glycine

This amino acid increases your energy and helps the synthesis of creatine.

Proline

This amino acid protects your joint.

Serine

This amino acid increases your energy, your memory and focus.

Taurine

This amino acid increases your energy, focus and endurance.

Tyrosine

This amino acid is important for the body because it regulates your hormones which are dopamine, epinephrine and adrenaline.

Amino acid derivatives

These amino acids are not part of the list of essential and nonessential amino acids because they derive from these 2 lists.

L-Carnitine (star)

This amino acid derives from Methionine and Lysine. This increase your energy, helps burn fat in your liver and burns fat.

Citrulline Malate (amino acids star)

This amino acid derives from Arginine which allows you to produce more Arginine in your body, helps to create more nitric oxide, more vasodilatation, more congestion, more endurance and more recovery buffer of lactic acid.

Choline and Inositol

These amino acids derive from Methionine and Serine. This helps in burning fat in the liver, helps to focus and it’s a fat burner.

amino acids food source

amino acids food source bcaa

If you don’t read my article about protein, click here.

Subscribe to my newsletter and share this article if you think it can help someone you know. Thank you.

-Steph

P.S. If you’re in Miami and you like Caribbean food, go to my cousin’s bistro to eat Haitian food, click here.

Start A Smart Company

startup company data

What’s up !!! This is THE stephane ANDRE. I watch an Olivier Roland’s video  and I learned some good stuff.

To create a company, most people advise to leave school or job to be 100% focused on creating the company. I advise you to start your business part-time and continue your school or job. An excellent method for this is « Lean Startup » . The principle of Lean Startup is to put on the market as fast as possible your product/service at minimum viable.

2 different methods

method scientific

Classic

Let’s take a closer look at what most people do. A person has an idea to start a company, so this person does a market research to minimize the risks. Then this person will seek financing with bank loans after calculating the needs of the business. These business needs based on a 3-years business plan that is extremely theoretical and hypothetical. You should know that in 99% of cases, as soon as the company is open and prospects are in contact with the products/services, these business plans have no connection with the reality of the field.

The problem with this method is that this person works for 1 year to create a product/service and when it’s available, this person realize that everyone doesn’t care. When the product/service isn’t selling, the stress rises enormously and you have to find a way to pay back people who lend money to your company.

Lean startup

With the Lean Startup’s method, when a person has a product/service idea, the principle is to find the minimum basic function of that which would interest the audience and the prospects who would be willing to buy. Then you have to do a test as soon as possible on the market. There is something very important that Michael Masterson said : « Before your business make its first sale, it’s nothing more than a set of unproven ideas that you are spending money on ».

That is why it’s necessary to set up a field test in the most real conditions possible with the most minimal version of your product/service.

Here is an example with someone who wants to buy a parking lot to rent it :

  • With the classic method, this person bought a random parking lot hoping to have many prospects interested in renting it.

  • With the Lean Startup method, this person will find an interesting parking lot to buy. Then this person will post an ad in an ads posting site and on social media and will wait to see if there are peope interested in renting it. If people call this person to say : « I’m interested in having your parking lot, I’d like to rent it », in this case this person will buy the parking lot. If nobody is interested in the parking lot, this person will not buy it.

Test quicky

test field

There are several other methods like this to test. In my case, it’s my blog to build my brand and until today, I’m doing it part-time. Here is a 3-part article in the power of a blog ( here  ).

Create my blog allowed me to :

  1. To know if I could find and keep my rhythm to write articles

  2. To know if I could share interesting things to create an audience

  3. To know if I could possibly monitize this blog with this audience

Once you have the idea, you need to test it as soon as possible to see what is happening on the field to collect feedback from the first customers and to know if you have an interesting business model or not. This test is excellent for eliminating a lot of uncertainty.

The cool thing about the Lean Startup method is that you’ll really start investing a lot of time, money and energy when you have your first customers who will help you improve your product/service.

Let things be clear, Lean Startup isn’t a magic formula, it’s necessary to act and start the process again, until you have a product/service that interest people.

Subscribe to my newsletter and share this article if you think it can help someone you know.

-Steph

Acromioclavicular Joint Injury

acromioclavicular joint injury

What’s up ? This is THE stephane ANDRE. With my training, I’m interested in biomechanics to avoid injuries. I read « Sport Medicine Media Guide » and I learned some good stuff.

Acromioclavicular joint is a joint between the clavicle and the scapula. Acromion is a continuation of the scapular spine and hooks over anteriorly. It articulate with the clavicle (collar bone ) to form the acromioclavicular joint.

Problems types

The most common problems are arthritis, fracture and separation. Arthritis is characterized by a loss of joint’s cartilage. Arthritis of acromioclavicular joint is common with weight lifter, especially with bench press and a little less with shoulder press. When there is a problem with the rotator cuff, it’s possible that there is also acromioclavicular joint’s arthritis.

Acromioclavicular separation

acromioclavicular joint injury type grade

When there is an acromioclavicular joint separation, it means that the ligament that connects the acromion and clavicle is damaged and that the 2 structures don’t align properly. Separation’s state can be weak or severe, that is why there is a system of « grade » according to which ligament is torn and the severity of the tear.

Grade I Injury – This is the weakest damage and the acromioclavicular joint is still aligned.

Grade II Injury – This is an average damage. Ligaments are only stretched but not fully torn. In case of stress (physical effort), the acromioclavicular joint becomes painful and unstable.

Grade III Inury – This is a serious damage. Ligaments are completely torn and the collar bone is no longer attached to the scapula, which creates a visible deformity.

Treatment of acromioclavicular joint arthritis

If the rest, ice, medications and change of the training program (changing the exercises) don’t work, the next step is a shot of cortisone. A shot of cortisone in the joint may have calmed the pain and may be permanently swollen. As each individual is unique, the effects may vary and it’s possible that it doesn’t swell permanently.

If non-surgical methods fail, it’s possible to perform a surgical operation. The pain is localized at the bones end that make contact with each other and the goal of the operation is to remove some of the end of the clavicle. This ambulatory surgery can be done with a small incision of 1 inch (2.5 cm) long or with the arthroscopy technique with 2-3 incisions. The results and recovery of these 2 surgical techniques are about the same. Most patients have a full movement by 6 weeks and can return to do sport by 12 weeks.

Treatment for acromioclavicular separation

Separation can create very painful injuries, so the first thing to do is to decrease the pain. Hold the arm in a sling, put ice and pack the shoulder for 20-30 minutes every 2 hours as needed. Acetaminophen and non-steroidal anti-inflammatory medications can also help calm the pain.

When the pain begins to subside, it’s important to move the fingers, wrists and elbow (and eventually the shoulders) in order to avoid having stiff or « frozen » shoulder. The length of time needed to regain complete movement and function depends on the severity or injury’s grade.

Recovery from Grade I acromioclavicular separation usually takes 10-14 days while Grade III takes 6-8 weeks.

When surgery

Grade I and II separations require very rarely surgery. With a Grade III injury, after surgery, it’s possible to have full body physical activity with some restrictions.

Statistics

  • More males than females suffer acromioclavicular joint injuries

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-Steph

A Pratical Tip To Validate Your Approach

data science tableau check

I have just enrolled in a Data Science course on Udemy  and I learned good stuff.

How was the A/B test « Number Of Product » ? Easy or difficult ?

Here is the result I found.

data science tableau check bar chart

I think you noticed there was something bizarre. There is an anomaly. We imagine that the more the client has products, the more the client is satisfied with the bank so this type of clients should stay in the bank.

In the first 2 bars we can see that a client who has 1 product is more likely to leave the bank than a client who has 2 products. But when a client has 3 or 4 products, we see a huge rate of clients leaving the bank.

Look, there is a little bizarre detail. In the 2nd bar, we can’t see the « Exited » label. This is because there is no place in the orange part to put the text. To make it simpler, we’ll remove the label « Exited ». Drag and drop on the « Exited » text label to the outside.

data science tableau check bar chart

data science tableau check bar chart

Perfect, we can read the percentages. On the 1st bar, we can see that among the client that have 1 products, 28% left the bank. On the 2nd bar, we can see that among clients who have 2 products, 8% left the bank. This show us that clients who have 1 products are more likely to leave the bank than clients with 2 products.

And for the next bars, we observe an anomaly. On the 3rd bar, we can see that among the clients who have 3 products, 83% left the bank. On the 4th bar, we can see that among clients who have 4 products, 100% left the bank. We clearly see that there is a problem and we need to do a deeper analysis to understand what is going on .

As a Data Scientist, we need to explain what happens in bars 3 and 4. Usually when a client has 3 or 4 banking products, that means he/she is satisfied and is loyal to the bank. But in our case, it’s the opposite because there is a high rate of client who left the bank. This is the time to do deeper analysis.

The first thing to analyze is the quality of the data. There is a very big anomaly and it may be because there is something insignificant in our data that disturbs the statistics. For example, it’s possible that when the bank selected these clients in this sample, there were very few clients with 4 products and all those clients with 4 products left the bank. Sometimes chance can create anomalies and you have to play attention to these effects of chance because they don’t seem important but they can create false interpretations.

To start, we will check the number of clients with 4 products.

In « Measure », move « Number Of Records » (which gives the number of observations) on « Label ».

data science tableau check bar chart

data science tableau check bar chart

We observe on the first 2 bars than many clients with 1 or 2 products selected for our sample. For clients with 3 or 4 products, we can see that there were fewer clients selected for our sample.

There are 220 clients with 3 products and 60 clients with 4 products. These small number of clients probably explain why we observe these anomalies.

In this sample of randomly selected clients, there are very few clients with 4 products and they all left the bank. In this situation, we can confirm that it’s a chance. When thing like that happen, you have to be very careful not to make conclusion too fast and make misinterpretations.

The conclusion is that a lot of clients have been selected for category 1 and 2. For category 3 and 4, there have been few clients selected so we can’t do accurate statistics. We need to do deeper analyze for these categories of clients with 3 and 4 products.

Now, let’s put the percentage back on the bar chart. Click on the « Back » button.

.

data science tableau check bar chart

Or do a click and drag of « SUM(Number of Record) » to outside.

data science tableau check bar chart

data science tableau check bar chart

We saw that there is an anomaly and what is interesting to do is to have a comment to remember to do a more in-depth analysis of columns 3 and 4.

Right-click between the bar chart’s title and the bars. Select « Annotate » then « Areas… ».

data science tableau check bar chart

A window appears. In this window, you write « Low observation in last 2 categories » and click on the « OK » button.

data science tableau check bar chart

data science tableau check bar chart

Click on the comment and move it on bars 3 and 4.

data science tableau check bar chart

data science tableau check bar chart

The next time you work on this bar chart, you will see this comment that will remind you to seriously analyze client who have 3 and 4 products.

Validate our approach

It’s time to show you how to validate an approach and how to validate the data. For this we will create a new A/B test.

Duplicate this worksheet with a right-click on the « NumberOfProducts » tab and select « Duplicate ».

data science tableau check bar chart

And rename the tab « Validation ».

data science tableau check bar chart

For this tab, we will erase the comment. Select the comment and press the « Delete » button on your keyboard.

data science tableau check bar chart

data science tableau check bar chart

Everything is ready, the idea is to find a variable that doesn’t affect our results. That is a variable that has no impact on a client’s decision to leave or stay in the bank.

Take for example, the variable « Customer Id ». Client’s identification number has no influence on the client’s decision to stay or leave the bank.

We’ll do an A/B test with the last digit of the « Customer Id » and we’ill check that there is the same clients proportion who leave the bank in the 10 categories of the last digit of the « Customer Id ». The 10 categories are the numbers 0,1,2,3,4,5,6,7,8,9.

Let’s g.To start, we will create the variable that contains the last digit of the « Customer Id ». To have this variable, we will create a « Calculated Field ».

Right-click on « Customer Id », select « Create » and click on « Calculated Field ».

data science tableau check bar chart

data science tableau check bar chart

Name the calculated field « LastDigitOfCustID ». In the text field, we use the « RIGHT » function with « Customer Id » in parenthesis to select the last character of the « Customer Id ». In our case, the last character of the « Customer Id » is the last digit.

Here is the code to write in the text field : Right ({Customer Id},1)

data science tableau check bar chart

data science tableau check bar chart

Oooops, you see there is a small mistake => The calculation contains errors.

There is an error in the formula because « Customer Id » is a number variable and the « RIGHT » function applies to a variable of type « STRING ».

To use the « RIGHT » function, we will convert « Customer Id » into a string. We will use the « STR » function with « Customer Id » in parenthesis.

Here is the code to write in the text field

And click on the « OK » button : Right (STR({Customer Id}),1).

data science tableau check bar chart

Now, you can see that our calculated field « LastDigitOfCustID » is in « Dimensions ».

Click on « LastDigitOfCustID » and move it on top of « NumOfProducts » in « Columns ».

data science tableau check bar chart

data science tableau check bar chart

Now we have a new bar chart and we see that for every last digit of the « Customer Id » there is about the same proportion of clients leaving the bank. All these proportions don’t correspond exactly to the average of 20% but these slight variations aren’t important.

Seeing this uniform distribution allows us to validate our data because these data are homogenous.

Conculsion

Here’s how you can check the homogeneity of your data. You take a variable that has no impact on the fact that a client leaves or stays in the bank. The example we did with the last digit of the « Customer Id » is excellent. We were able to verify that in each of the categories taken by this variable, if there was the same proportion of clients leaving the bank. As is the case, we can validate our data.

Imagine another result. When we do the test with the last digit of the « Customer Id », we observe that for one of the numbers, the rate of clients who left is really higher than the average. This shows us that there is a problem in our data because it indicates an anomaly.

You can find other ways to verify your data by using other « insignificant variables » to see if the distribution is homogeneous. But be careful when you select an « insignificant variable » because there may be traps.

Here is an example. If you create a variable that takes the first letter of the first name, the distribution will not be homogeneous. The reason is simple, there are many more people who have a name that starts with the letter « M » than with the letter « Y ».

Share this article if you think it can help someone you know. Thank you.

-Steph

Adapt Your Training To Your Morphology (Part 2)

anatomy body squat morphology knee big belly

This is The Stephane Andre and today I’m talking about adapt your training to your morphology. I read Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff. This is the part two.

If you didn’t read Part 1, click here.

Legs

Improve your squat position

anatomy body squat morphology knee big belly

There is a tip to reduce the lower back’s effort and limit the hamstrings tension. Put the barbell on posterior deltoids like powerlifters.

This method increases the power of lifting from the back. This allows you to lift heavier weights. Use weightlifting shoes (solid raised heel) or a wedge under the heel to not have your buttocks too back. This allows you to have a greater amplitude with the thighs flexion.

You feel better your quadriceps, because you limit the torso’s tilt. The low barbell and raised heel combination allow you to lift heavier weights. It’s useful for people are tall or with stiff ankles to correct their squat’s execution.

Front squat to target quadriceps

anatomy body squat morphology knee big belly

Front squat limits the torso’s tilt. Having the barbell at the front reduces the work of the lower back. It also decreases the tension of the hamstrings and adductor muscles. But, it forces quadriceps to make more effort to extent the thigh.

Which means it’s the perfect squat for thighs. Unfortunately, you can’t lift heavyweights like the classic squat. It’s recommended to do it with heels elevated for better stability.

For tall people, front squat is very hard to do. Their torso is more inclined, which make it more difficult to hold the barbell.

Spread the legs to less incline the torso

anatomy body squat morphology knee big belly

There is a squat’s technique to limit the torso’s inclination. This involves spreading the legs with the feet outward. Some powerlifters do this technique with the legs almost wide apart. With the legs apart, this limits the legs flexion.

To do squat with the legs apart, it’s necessary to be flexible of hip joint and adductor muscle.

The advantage of the big belly

anatomy body squat morphology knee big belly

Having a big belly for squat and deadlift allow to compress it against the thighs. This helps to limit the inclination of the torso and the back’s rounding. This has the effect of protecting the lower back and limiting the risk of herniated disc.

This is the reason you can see a lot of powerlifter/weightlifter’s champion with a big belly. They take care to keep their belly fat with an rich diet.

Different forms of knees

anatomy body squat morphology knee big belly

It’s important to take into account the different morphologies, especially for the knees.

Arched legs (genu varum) are not more risky than normal legs.

This is two cases. People with X legs (genu varum) and people who can overly extend the thighs (genu recurvatum). It’s recommended for them to not use very heavyweigts for legs exercises.

Cases of genu valgum are often :

  • People who were overweight during their youth, when their leg bones were malleable. Their legs deformed because of the overload. Now, they have this X shape.
  • For women, in fact women have wider hips to have children. This influences the femur’s direction which are generally more inclined.

     

For people with genu valgum. If the genu valgum is to excessive, the joint would be overused. The medial collateral ligament would be extremely tense. The lateral meniscus, the articular surfaces coated with cartilage of the external condyle of the femur, and the external lateral tuberosity of the tibia would be subjected to excessive friction, which would cause pathologies of wear.

For people with genu recurvatum. These are people who are essentially very flexible named hyperlaxes or women whose muscular and ligamentous hyperlaxity is related to reproductive function.

There is something rare. Knees with genu recurvatum can sometimes have some problems like the meniscus pinching. This can happen when the knees are rapidly expanding and the meniscus haven’t had enough time to slip, or during an exercise with a heavy weight that has forced the hyperextension of the thigh.

It’s for this reason that it’s recommended to people suffering from a genu recuvatum pathological never to totally block the knees at the end of the leg’s extension for squat or leg press.

Note

For 2 people who are the same size, it’s important to consider the torso-leg ratio.

anatomy body squat morphology knee big belly

Type A :

People with proportionally long legs and a short torso will have trouble doing a proper squat without tilting their torso excessively forward.

On the other hand, the long legs and long torso facilitates the execution of the good-morning, classic deadlift and Romanian deadlift.

Type B :

People with proportionally short legs and a long torso will have the facility to squat safety without tilting their torso excessively forward. It’s for this reason that the great champions of powerlifting, squat specialist, have this type of morphology.

Share this article if you think it can help someone you know. Thank you.

-Steph