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Skinfold Body Fat Assessment
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- เผยแพร่เมื่อ 15 ส.ค. 2024
- This video shows Dr. Evan Matthews explaining how to perform a body composition assessment to estimate body fat percentage using skinfolds. This is a common field test used in fitness centers and with athletes and the general population. This video starts by going over general tips and guidelines, then moves to how to perform the most common seven sites, then how to use the skin fold measurements to calculate body fat percentage (the rest of the tissue is lean tissue mass).
Link to video showing how to perform hydrostatic weighing (under water weighing) to assess body fat percentage.
• Hydrostatic - Under Wa...
Link to video showing how to use bioelectrical impedance analysis to assess body fat percentage.
• Body Fat Percentage - ...
Link to video showing how to measure waist and hip circumference.
• Waist and Hip ratio
Male Body Density Equation (ACSM’s Guidelines for Exercise Testing and Prescription)
Body Density = 1.112 - (0.00043499 x sum of skinfolds) +
(0.00000055 x square of the sum of skinfold sites) - (0.00028826 x age)
Female Body Density Equation (ACSM’s Guidelines for Exercise Testing and Prescription)
Body Density = 1.097 - (0.00046971 x sum of skinfolds) +
(0.00000056 x square of the sum of skinfold sites) - (0.00012828 x age)
Siri Equation to go from body density to body fat percentage
Total Body Fat % = (495 / Body Density) - 450
Link to Dr. Evan Matthews website.
sites.google.c...
Best video on youtube regarding this topic. Clear, concise and lots of tips on getting the fold right. Bravo!
I'm glad you found it helpful.
so helpful having the calculations at the end with all the measurements included in the video. thank you thank you!
You are welcome.
Math is very laid out and easy to understand. Thank you for this video! 🎉
You are welcome.
Extremely well explained! Thank you!
I'm glad it helped.
Fantastic. One of the best explanations and instructional videos I have seen.
I'm glad it helped!
Perfectly wholesome, just what I was looking for.
I'm glad it helped!
Yes, I hate all those overly sexualized body fat measurement videos on youtube....
Really really good video, I've been looking for something like this and didn't manage to find it. Really explanatory, really well presented, thanks a lot!
I'm glad it helped!
thank you very much, Dr.Evan Matthews
I'm glad it helped.
Thank you so much for giving me the answer to my questions.👍
You are welcome.
EXCELLENT descriptions. Thanks.
I'm glad it helped.
Great explanation
I'm glad it helped.
Excellent video on TH-cam thank
Thank you.
This was very helpful, thank you
You're welcome!
My professor already presented us the same formula but instead of getting the sum he even averaged that, e.g, dividing 105.5 by 7. Which throws the calculations way off
Mistakes happen. We all say things wrong sometimes.
Fantastic brother thank you
I'm glad it helped.
Excellent!
I'm glad it was helpful!
thank you so much! very helpful
Happy to help.
Well explained
Thank you!
Really appreciate this video! But does density has a unit? Or is it unit-less?
Thank you. I believe the correct units are gm per cubic cm.
very good explain
I'm glad it helped.
how would you find the mean of 3 trials? Would you still only find the average of 2 trials or all 3 trials?
If they are all within 2mm you can just average them all.
Other videos are saying to wait 3sec before reading the caliper to get a more accurate number...a lot of these videos say so different things...how to know. :(
The ACSM guidelines say to read within 1 or 2 seconds and no longer.
Anyone notice in the beginning how his shirt changes colors?
Green screens are tough for an amateur like me :)
If it has a +/- 3% error, you might as well do it on sight. It's probably only interesting to check changes, not levels.
It's best to use body fat percentage (regardless of method) to track progress over time as you mentioned. Visual inspection lacks the objectivity needed to track across time. Visual inspection can also be misleading as it is difficult to account for non- fat tissues like muscle.
Excellent video, thank you. Just a question, getting a proper grip on the abdominal test site with overweight or obese people is something I struggle with to keep the calliper outside of the navel cavity. It’s easier to take a vertical reading but it would take so much fat in the reading that I’m afraid it won’t be accurate at all. How do I go about getting an honest reading for that site? Thanks
Good question. I think your best bet would be to follow the pinch recommendations from the ACSM presented here and accept that the caliper may go into the belly button.
@@VivoPhys thank you, I’ll give it a read but feel that I’m validated wanting to do it that way. Keep up the good work!
Awesome, but how do you do this to someone that's overly obese?
Good question. With morbid obesity this test cannot be used because the calipers cannot open wide enough.
Why is the skin fold only taken on the right side?
It's just to standardize the measurements from test to test to minimize variability.
abdominal @10:48
wow, all that work for a error of +- 3%, i can aproximate that with my eyes :)))) and i dont understand why no weight and height is in the calculation..
It sounds so ridiculous to measure/estimate bodyfat percentage without weighing the persons total bodyweight... Imagine 2 (same age and gender and height) skinny 150 and a muscular 250 pound people with the same 7 site skinfold numbers and using these charts that do not take into account total bodyweight... They'd indicate the same bodyfat % ??? I'm not a math wizard, but we're not talking about a small 3% deviation here. So I cannot but conclude these methods are very inaccurate. What's your view Evan?
Hi MatrixView. That is an interesting critique of the technique. The basic theory is that about 1/3 of the fat is under the skin and the other 2/3 is deeper within the body. So if the subcutaneous fat increased or decreased the deep fat would as well. Adding muscle (your example of a bodybuilder) would increase your body mass, and increase the deep tissue that can hide body fat. However, adding muscle would not effect your ability to pinch subcutaneous fat because it is outside of the muscle. With that said the ratio of 1/3 subcutaneous to 2/3 deep fat should stay the same.
With all that said you might find the study below interesting. It seems to suggest that on average skinfolds work well for bodybuilders, but their error might be too high to measure the small changes in body fat percentage over time in an individual bodybuilder. I only skimmed the paper, but I hope you enjoy it. It's a high quality journal.
cris.maastrichtuniversity.nl/ws/portalfiles/portal/65522190/lichtenbelt_2004_body_composition_changes_in_bodybuilders.pdf
Just keep in mind that Asians, for example, would crush a skin fold test, yet are prone to diabetes. This is because skin fat is an organ which allows emergency storage for extra blood glucose (like social meals, holidays). Without this, the liver must cram any excess sugar in between the internal organs, which is associated (big time) with type 2 diabetes. Apparently, harder to store there, leading to higher blood glucose levels, higher insulin, and insulin nose blind cells. Diabetes.. Thus, the reason liposuction could lead to obesity (as I have observed) years after the procedure... Bmi is garbage due to muscle and the fact that a mere gallon of water water weighs 8 lb. On a hot day, your roofer might drink 2 gallons of water. My dry weight in morning v. Evening weight can vary from 5 to 18 lb, when adding clothes, depending on the time of year.. Really, the only metric which makes any sense is the stomach to hip ratio, which tracks how much excess sugar a person is storing between the internal organs.... Weighing one's self every morning to a half a pound (knowing how much muscle workout or cheat calories) is very useful. I usually gain 4 lb after one cheat meal, which takes me 6 days to get off. Weighing each morning gives me motivation not to cheat. Eventually, if the FDA wakes up, a non prescription continuous blood glucose monitor, which syncs with the phone will offer the best anti aging tool ever. Humans are feedback machines, which is why we have pain receptors. So, a cgm will allow us to see the damage in real time, and which foods are causing it. No longer would a person who has a cgm have a mental desire to eat consistently as if we were storing food for the winter or next famine.
Very interesting!