Archive for April, 2010

Twitter Weekly Updates for 2010-04-24

posted by admin in Twitter Updates

Weight Loss Equations and Calculators – Are They Accurate?

posted by admin in Other Fitness Related

If you search the internet looking for weight loss calculators and equations, you’ll be bombarded by a plethora of tools to calculate such interesting facts as:

  1. Your Basal Metabolic Rate (BMR), or how many calories you burn each day if you were to sleep for 24 hours straight
  2. Your body fat percentage
  3. Your energy expenditure when you exercise (how many calories you burn)
  4. Your predicted strength
  5. How much muscle you can gain
  6. Your body mass index, or BMI

…and so on.

But just how accurate are these equations?

To understand the reliability of such weight loss orientated calculations, you must first understand how these equations are derived. Having studied science at university, I had to scrutinise numerous papers that determined such equations as have been listed above.

These equations are determined empirically. In other words, they are derived based on the results of an experiment. How this is most commonly accomplished is as follows:

  1. A researcher (or group of researchers) will conduct an experiment.
  2. They collect the results.
  3. Using the data that has been collected, they will develop an equation that satisfies this data with a line of best fit.

To illustrate this concept, assume that the following data is collected in regards to a simple money orientated experiment where the researches compared the amount of money invested to the return on investment (ROI) with 5 different people:

$ Invested ROI $
$250 $23
$500 $49
$1000 $100
$2000 $213
$5000 $550

Looking at these numbers, the approximate ROI is equal to about a tenth of the amount of money invested. So equation for the line of best fit would be something similar to:

$ROI = $ Invested / 10

Of course, the line of best fit will be slightly different to this equation because I don’t currently have any software that will accurately calculate the line of best fit based on this data :)

So, using this simple example, you can see that the actual equation is accurate for only one set of data – where $1000 was invested. All the other four sets of data do not produce accurate results.

Similarly with experiments pertaining to weight loss and body composition, this is often the case. More often than not, almost all (if not all) of the data does not fit perfectly on this line of best fit. So the equation is hardly ever 100% accurate for the group of people participating in that experiment.

In such an experiment, this equation is often the average of all the usable results that were collected. The equation is also subject to any errors that may have been incurred as a result of a poorly designed experiment, or even just acceptable inaccuracies such as human error, equipment error etc.

Applying this information to your weight loss endeavours, it is important to understand that equations that have been derived from experimental data are average values only. In all likelihood, they are never going to be accurate predictors of what you are measuring.

So why is it that these equations are based on average results and therefore are not necessarily accurate for your body? A couple of key reasons:

  1. Humans vary widely in their genetic make-up, lifestyle, body composition etc. There are millions of chemical reactions occurring simultaneously within your body. With so many variables at hand, it is impossible with our technology today to derive an accurate equation to predict the likes of body composition, energy expenditure, calorie consumption etc. Hence an average of a group of results is utilised.
  2. Average values eliminate extreme values and will show a general trend. Thus the degree of inaccuracy is lessened.

The weight loss equations and calculators widely available should therefore be utilised as a guide. They will not predict with any degree of certainty how much weight you will lose, or how many calories you should consume to accomplish a particular goal. They can often be useful as a starting point and then you can measure your results moving forward. If your results do not equal your expectations, you will then have to reconsider what you are doing and make the necessary adaptations to your approach.

Twitter Weekly Updates for 2010-04-17

posted by admin in Twitter Updates

Twitter Weekly Updates for 2010-04-10

posted by admin in Twitter Updates

Should You Lift Weights to Lose Weight?

posted by admin in Exercise

It’s widely accepted that reducing the amount of calories that you consume will help you to lose weight. Further, performing aerobic exercise is also well known to help with weight loss.

Yet what about weight lifting? Resistance training is commonly associated with gaining weight or building muscle. It is assumed that the bodybuilder will spend time in the weights area of the gym, while all people seeking to lose weight will stick to the cardio machines.

So is this assumption true? Definitely not.

Weight lifting can have some profound benefits for weight loss in a number of manners. Although lifting weights is necessary to develop significant amounts of muscle, this is only possible when your lifestyle and diet are aligned with weight gain. If you live in a manner that encourages weight loss, lifting weights will further encourage progress in this regard.

The reason for this comes down to an energy balance. This is the basic and widely accepted equilibrium of calories on versus calories out. Under normal circumstances, if you consume more calories than you expend, you will gain weight. Conversely if you consume less calories than you expend, you will lose weight. Whether or not you weight train does not change the “rules” of this law by any means.

How does weight lifting help you to lose weight?

Weight lifting can assist weight loss in a multi-faceted manner:

1. Weight lifting expends calories during the workout

Any form of movement requires energy. Lifting weights will expend energy (measured in calories, or kilojoules). The more intense your weight lifting workout, the more energy that will be expended.

When we consider the calories in versus calories out equation, it makes sense to increase your calorie expenditure to encourage an overall energy deficit. Both weight training and cardiovascular training are effective ways to do this.

2. Weight lifting induces a state of recovery, requiring additional calorie expenditure after exercise

When you lift weights, you place stress on the muscles being worked. In effect, you are damaging those muscle fibres (which is why you may be quite sore a day or two after weight lifting). It is your body’s job to repair that damaged tissue. This process of repairing your muscle requires significantly more energy than would otherwise be utilised if no exercise were performed. Thus, this time of recovery will require a significantly heightened degree of calorie expenditure.

Recovery can take up to 10 days following a weights workout. Not a bad investment for less than an hour of your time!

3. An increased amount of muscle increases calorie expenditure

Muscle burns far more calories than the equivalent amount of fat tissue. Thus, muscle is termed as “metabolically active”, meaning that it has a significant influence on your metabolic rate. An increased amount of muscle mass means that you will be burning additional calories each day.

1kg of muscle mass will burn somewhere within the vicinity of between 50-200 calories per day. The precise amount is not known, as many studies will quote different figures based on their findings. However if you are carrying additional muscle mass, you will be burning more calories if you were to sleep all day long. Your body needs to burn this energy just to maintain this muscle. Resistance training can assist in some muscle development to help with weight loss.

4. Being stronger means you are likely to expend more energy through physical activity

Lifting weights can aid your strength. If you are stronger, you will have the ability to lift heavier weight. This means that you will be expending more energy lifting this heavier weight, thus further aiding with your weight loss endeavours.

Twitter Weekly Updates for 2010-04-03

posted by admin in Twitter Updates

Twitter Weekly Updates for 2010-04-03

posted by admin in Twitter Updates

Women’s Protein Powder Supplements – Are they Safe and Which is Best?

posted by admin in Food & Nutrition

There are two distinct categories of protein powders, “standard” protein powders and “women’s” protein powder. If you’ve come to this article via search engine, chances are that you’re performing your due diligence on protein powders for women. The primary aim of this article is to explain what a protein powder is, the differences between standard protein powders and women’s protein powders, and what the best choice for protein powder is for you.

Is Protein Powder Safe for Women?

Before we get into the nitty-gritty of “which” particular protein powders are most suitable for females to consume, let’s define exactly what a protein powder is. There is a lot of confusion on the topic as it is a very common misconception that protein powder will necessarily bulk you up. Hence, many women shy away from protein powder for this very reason.

Protein powder does not bulk you up by any means. It is a dietary supplement comprised primarily of proteins. These proteins are derived from food sources. Essentially what happens is that a food is put through a series of processes whereby the proteins are extracted and manufactured into a powder form. Then some flavours (and possibly other ingredients such as vitamins, colours, minerals etc.) are added to the mix. In this sense, the protein consumed within a protein shake is no different to that found in wholefood (just more processed). So just as with food, over-consumption of protein powder will lead to weight gain.

Protein powder should never replace a whole-food based diet, rather it should supplement a whole-food diet. Protein powder can be a useful supplement for:

  • Convenience (as it’s much easier to use a protein shake rather than carry around a cooked chicken!)
  • Encouraging recovery after exercise (so your body has nutrients available to repair damaged cells and boost the immune system)
  • Weight Loss (as a serve of protein powder can be very low in calories)
  • Toning (toning is the combination of fat reduction and some muscle gain for shape; protein powder can assist in both areas)
  • Muscle Gain (consumed in conjunction with a high calorie diet and an appropriate exercise routine, a protein powder can assist in muscle development)

How protein powder assists in these goals is outside of the scope of this article, however you are encouraged to browse around this website as there are hundreds of other articles that delve deeper into protein and it’s functions within the human body.

Because your typical protein powder is food derived, it is safe to consume. There are protein powders available with and without artificial sweeteners. Particularly if you are following an exercise regime, a protein powder can be a very useful tool within your arsenal.

Women’s Protein Powder Supplements – What Makes them Different?

If you considering the typical marketing of the two main categories of protein powders:

  • The typical protein powder is marketed to a male audience with a desire to gain muscle and “bulk up”.
  • Women’s protein powder is marketed toward a female audience for weight loss and toning.

Here’s the secret that many of the female protein powder manufacturers do not want you to know – there is no protein more suited to women. Though the marketing may imply otherwise, ultimately the colour of the protein powder bears no resemblance to the effectiveness of the protein product itself.

The main difference between male to female protein requirements the quantity of serving, not the type of protein. Consider within nature – there is no particular food source of protein that only women should consume. Since protein powders are food derived, how can they possibly be an exception to the rule? Women’s protein powders commonly include “soy” proteins, or other inferior vegetable based proteins (relative to milk/whey/casein and egg based proteins). The quality of these proteins is extremely poor and very cheap to manufacture too.

Almost all brands carry a “Standard” protein powder which is commonly marketed to the male bodybuilder. Thus, there is a lot of competition on the market and prices are kept relatively low. In contrast to this, womens protein powder is perceived as a niche market. Consequently these brands are more expensive per serve, made with inferior ingredients and often come in smaller sized tubs. It is common for female protein powders to be sold in 0.5kg and 1kg tubs. Meanwhile your typical protein powder will often come in 1kg, 2.3kg or 4.5kg tubs.

So if you are seeking value for money and product quality, you are generally better off going for a standard protein powder rather than a women’s specific protein powder supplement under ordinary circumstances. You will almost always obtain a superior quality product at a much more reasonable price. If you are interested in seeing the high value products that we stock within our store, please visit the protein powders area.

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