Looking in the mirror is the quickest and simplest way to see if you are too fat by everyday standards, but this alone will not give you the accurate information that you need as competitive athletes. Carrying around excess weight in any sport has got to be a distinct disadvantage as it can adversely affect strength, speed and endurance. Carrying around this extra weight is not only unnecessary, but also costly in terms of energy expenditure. In endurance sports surplus fat can reduce speed and increase fatigue. It’s like carrying a shopping bag with you as you run, it’ll make it harder for you to get up speed, slow you down as cause you to tire quickly.
Muscle is stronger and more powerful than fat although I’m sure you’ll agree it‘s much harder to acquire! If two athletes weighed 100kg, but one comprised 90 kg lean (10 kg fat) mass and the other 70 kg lean (30kg fat) mass, the leaner one would obviously have the advantage. Possibly the only sport where fat could be considered an advantage is sumo wrestling!
A fat free body however would not survive. It is important to realise that a certain amount of body fat is absolutely vital. In fact, there are two components of body fat: essential fat and storage fat. Essential fat includes the fat which forms part of your cell membranes, brain tissue, nerve sheaths, bone marrow and the fat surrounding your organs (e.g. heart, liver, kidneys). Here it provides insulation, protection and cushioning against physical damage. In a healthy person this accounts for about 3% body weight. Unfortunately for the ladies there’s additional essential fat which is sex-specific and is mostly stored in the breasts and the hips. This fat accounts for a further 5-9% a women’s body weight.
The second component of body fat is storage fat and is an important energy reserve that takes the form of fat (adipose) cells under the skin and around the organs. Fat is used virtually all the time during any aerobic activity; while sleeping, sitting, walking and in most forms of exercise. The body generally uses fat from all sites and an average person has enough fat stores for three days and nights of continuous running. In practise you’d ‘blow’ way before your stores ran out!
In terms of health risks associated with fat you can use a measurement called the Body mass Index (BMI), which classifies different grades of body weight. The BMI of a person can be calculated by dividing a person’s weight (in Kg) by the square of his or her height in metres. My BMI calculation would look like:
85 / (1.87×1.87) = 24.2
BMI Less than 20 — Under Weight
BMI 20-25 — Normal Weight (Grade 0)
BMI 25-30 — Over Weight (Grade 1)
BMI 30-40 — Obese (Grade 2)
BMI Over 40 — Severely Obese (Grade 3)
Doctors use this chart to assess a persons risk of acquiring certain health related conditions, such as heart disease.
The thing here is that when you stand on the scales you weigh everything; bone, muscle, water and fat. Therefore, you don’t know how ‘fat’ you actually are. Someone with a lot of muscle and little fat could be classed as overweight and vice versa. This is where ‘body composition’ comes into play.
The body is composed of two elements; lean body tissue (muscles, organs, bones and blood) and body fat. The proportion of these two components is called body composition. This is more important than total weight.
For example, two people may weigh the same, but have different body composition. Athletes usually have a smaller percentage of body fat and a higher percentage of lean weight than those who are less physically active. Lean body tissue is functional (useful) weight, whereas fat is non-functional in terms of sports performance.
There are various methods you could use to measure your percentage body fat however the most popular methods are with skinfold callipers or bio electrical impedance.
As a personal trainer you’re taught how to measure percentage body fat using these methods however all methods come with a certain degree of inaccuracy. Skin capllipers measure the folds of fat at various measurement points throughout the body and convert to an overall figure, however this relies on a great deal or accuracy when re-evaluating clients. I tend to use bio electrical impedance testers due to the tests being much quicker to conduct. These are electrical devices that pass a mild electrical current throughout the body to measure it’s conductivity. They can be either hand-held or small boxes with wires that attach to the body via pads.
You’re local gym should be able to provide you with a body composition test should you wish find out how you fare. Again there are guidelines as to your results based on your age group. The table below will give you some idea of where you score.
MALE
AGE EXCELLENT GOOD FAIR POOR
19-24 10.8% 14.9% 19.0% 23.3%
25-29 12.8% 16.5% 20.3% 24.4%
30-34 14.5% 18.0% 21.5% 25.2%
35-39 16.1% 19.4% 22.6% 26.1%
40-44 17.5% 20.5% 23.6% 26.9%
45-49 18.6% 21.5% 24.5% 27.6%
50-54 19.8% 22.7% 25.6% 28.7%
55-59 20.2% 23.2% 26.2% 29.3%
60+ 20.3% 23.5% 26.7% 29.8%
FEMALE
AGE EXCELLENT GOOD FAIR POOR
19-24 18.9% 22.1% 25.0% 29.6%
25-29 18.9% 22.0% 25.4% 29.8%
30-34 19.7% 22.7% 26.4% 30.5%
35-39 21.0% 24.0% 27.7% 31.5%
40-44 22.6% 25.6% 29.3% 32.8%
45-49 24.3% 27.3% 30.9% 34.1%
50-54 26.6% 29.7% 33.1% 36.2%
55-59 27.4% 30.7% 34.0% 37.3%
60+ 27.6% 31.0% 34.4% 38.0%
With most multi-sport events (and the associated disciplines of) being endurance based you’d expect the pro’s to be in the ranges of 6-12% for males and 8-18% for females. The minimum recommended percentages for men and women is 5% and 12% respectively.
Clearly, there is no ideal body fat percentage for any particular sport. Each individual athlete has an optimal fat range at which their performance improves yet there health does not suffer. Each of us are also genetically different which has a direct impact on our body composition and ultimately performance.
Don’t get too hung up on your own percentage body fat calculations because no matter how hard you try to change how you are now, it may just be impossible due to how we’ve been built as individuals!
Happy Training!!
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