What is the Siri equation?
The Siri Equation is based on the two compartment model, that is the body is made up of essentially two components: fat mass (the total fat of an individual) and fat-free mass (everything else: bone, water, lean tissue etc). Studies have determined that the densities of these two components are:
How do I ask Siri to include decimal points in equations?
If you want to include a decimal point in your equation (e.g., "220.9"), you should say "point" (e.g., "two hundred twenty point nine"). Wait for Siri to answer. Depending on how complex your question is, this can take anywhere from a second to several seconds.
How can I ask Siri questions about math?
Ask Siri other math-related questions. For example, you could say "How many prime numbers are between 1 and 100?" You could also ask Siri to calculate the tip for a meal by saying "What is a 20 percent tip on a $350 meal?" Ask Siri about equations you don't know.
How to use Siri on iPhone?
Siri will help you control all kinds of settings on your iPhone, iPad, or Mac. You can ask Siri to: Turn Wi-Fi on/off. Turn Bluetooth on and off. Switch to Airplane Mode (you’ll need to disable it again manually) Brighten and darken the display. Raise and lower the volume. Turn on Low Power Mode.
How does the Siri equation work?
Many body composition equations derive their measure of percent body fat from first determining body density. Once body density is determined, percent bodyfat (%BF) can be calculated using the Siri equation below : % Body Fat = (495 / Body Density) - 450.
What is the Brozek equation?
The body fat percentage is commonly calculated from one of two formulas (ρ represents density in g/cm3): Brozek formula: BF=(4.57/ρ − 4.142) × 100.
What is the difference between Siri and Brozek equations?
The %BF-Brozek reflects a better agreement than the %BF-Siri with %BF-DXA with respectively a mean difference of -4.0 %BF (limits of agreement = -10.9 to 2.9%) and -5.7 %BF (-12.6 to 1.2). The Bland and Altman plots confirmed that %BF-Brozek reflects a better agreement with %BF-DXA.
What is the Durnin and Womersley formula?
The Durnin-Womersley formula is a skinfold equation to calculate body fat percentage, is ideal for the general population (ages 17-72), utilizes 4 skinfold sites, and considers gender.
What is the formula for calculating body fat?
(1.20 x BMI) + (0.23 x Age) - 16.2 = Body Fat Percentage.
What is a healthy visceral fat range?
between 1 and 12According to the manufacturer's information, a rating between 1 and 12 indicates a healthy level of visceral fat, whereas a rating between 13 and 59 indicates excess visceral fat.
What my body fat percentage should be?
According to the American Journal of Clinical Nutrition, there are healthy body fat percentages based on your age. For people aged 20 to 39, women should aim for 21% to 32% of body fat. Men should have 8% to 19%. For people 40 to 59, women should fall between 23% to 33% and men should fall around 11% to 21%.
What is a healthy body density?
n Overall body density of body ~ 1.02 – 1.10.
What does it mean when your body is dense?
Body density consists of two primary components: fat and fat-free mass. Image Credit: UberImages/iStock/Getty Images. In physics, density is defined as an object's mass divided by its volume. Body density is essentially your compactness, or how much you weigh for every square inch of space you take up.
What is Jackson Pollard?
The Jackson and Pollock (JP) equations [12, 13] are multiple regression equations with functions to estimate body density (BD) from the sum of skinfolds and age. Once BD is known, the Siri [14] two-component model is used to convert BD to percentage body fat.
What is Suprailiac fold?
Supra-iliac or flank: A diagonal fold just above the front forward protrusion of the hip bone (just above the iliac crest at the midaxillary line).
What are the 3 skinfold sites?
A three-site skinfold is commonly done and includes the chest, abdomen, and thigh on men and triceps, suprailiac, and thigh on women (figure 11.1). The five most common sites assessed include triceps, subscapular, suprailiac, abdomen, thigh (McArdle, Katch, and Katch 2005).
How do you calculate muscle to fat ratio?
How to calculate lean body massMeasure your body weight.Multiply your body weight by the fat percentage.Subtract the result from your body weight.
What is the optimal body fat percentage?
According to the American Journal of Clinical Nutrition, there are healthy body fat percentages based on your age. For people aged 20 to 39, women should aim for 21% to 32% of body fat. Men should have 8% to 19%. For people 40 to 59, women should fall between 23% to 33% and men should fall around 11% to 21%.
Derivation
The Siri Equation is based on the two compartment model, that is the body is made up of essentially two components: fat mass (the total fat of an individual) and fat-free mass (everything else: bone, water, lean tissue etc). Studies have determined that the densities of these two components are:
Similar Equations
Here are a few other equations that similarly convert body density to percent body fat. Various equations are required to best fit different populations, age groups and gender.
Does Siri do addition and subtraction?
Addition and subtraction, Siri will return an easy to follow number line showing movements to the sum.
Does Siri do division?
Division, Siri provides the answer, reduces the fraction, gives the number as a decimal, and even shows a mixed fraction.
What can Siri do?
Apple Watch, AirPods, or iPhone, you can ask it to do lots of things: Call [a contact, name, business] Call [contact] on speaker. Send a message to [contact name] Sent a text to [name], and let them know I’m running a little late. Send an email to [name].
Can Siri translate?
Siri in iOS 11 gained the ability to translate for you. While it’s a little confined (you can only translate from U.S. English), it allows you to translate into French, German, Mandarin, Spanish, and Italian. Siri will both speak the translation and show it on screen with a play button you can use instead of speaking if you like.
Is Siri a good musicologist?
Now that Apple has introduced the HomePod, Siri has become an excellent musicologist. Here’s a few things you can ask to get you started, with a more extensive HomePod-focused list available here.
Does Siri search for information?
Siri will search for information, so you can ask it the kind of questions you might go online to resolve, such as
Can I ask Siri to send a message?
If an app is enabled to work with Siri (in Settings>Siri), you can also ask Siri to do things with those apps, so you might ask it to send [name] a message in [app name].
Can Siri set up night time Homekit?
And if you have scenes, you can ask Siri to set them up — you can even have it set up your night time HomeKit settings by saying “goodnight.”
How to type Siri questions?
Did you know you can type Siri commands on iPhone and iPad? It comes in handy.
How many Siri commands are there?
Discovering what you can say or ask Siri is tough to do. That’s where Keeping Up With Siri comes in. In this series, I highlight the available list of 366 Siri commands within Apple’s official Siri Guide—breaking down each category into its own post. For instance, this post specifically covers using Siri to ask questions and get answers for a wide range of topics, such as math, space, events, history, and the dictionary.
Can Siri do square roots?
These two commands easily show how Siri’s math skills have improved. Now Siri can do square roots and exponents. What’s more, Siri can do unit conversions with currency, which is much tricker to carry out for a Voice Assistant considering currency values change over time.
Can Siri answer date information?
Siri is able to answer date information about popular events. For instance, with the above two examples, Apple gives us two slightly different ways to ask Siri about events. With the first, Apple shows how Siri knows recent events that change over time, like popular concerts.
Does Siri answer more questions than before?
As proof of this, in the WWDC keynote this year, Apple touted that Siri now can answer 20 times more facts than before.
Does Siri know population statistics?
Last but not least, Apple amps up civi commands with the new ability for Siri to know population statistics for both countries and cities around the world. Siri sites Wikipedia as the source.
Does Siri know more about the universe?
Quite unexpectedly, Siri now knows more about the universe . When answering these two questions, Siri sources Wikipedia.
