...good info on bb precontest dieting...and diets in general!...

Discussion in 'Fitness & Nutrition' started by Leo95SE, Mar 26, 2005.

Thread Status:
Not open for further replies.
  1. Leo95SE

    Leo95SE The OMINOUS one

    Mar 16, 2000
    Likes Received:
    over there, no here
    this doesnt nec have to be applied to precontest conditions only, but its a great overall plan that can be supplemented with Christophers thread.
    Chris feel free to add it to your if you like it..

    from here

    Snipped at Posing. The complete article is above, but wouldnt fit here, and posing and everything after only relates to less than a handfull of ppl here. the info below provides a lot of good general knowledge.

    Bodybuilder. The word seems more like a question than a simple word to me. What defines a bodybuilder? Is a bodybuilder someone who merely lifts hard? Is a bodybuilder someone who lifts hard and watches what they eat? Is a bodybuilder someone who competes in physique competitions? There will probably never be a good definition of the word "bodybuilder," as everyone has their own.

    Why Aren't There More Competitive Bodybuilders?

    I believe everyone can agree upon the fact that those who choose to compete are a different breed than all other people who call themselves "bodybuilders." Anyone who has ever attended a bodybuilding competition may wonder why there are so few competitors. Some classes only have 2-3 competitors!
    The simplest answer I can come up with is that not many people want to do what it takes to get onstage. Dieting 12-20 weeks, never missing a meal, cardio everyday, and energy levels so low that you don't feel like getting off of the couch because you are constantly hungry waiting for your next meal does not appeal to the masses.
    I can personally attest to the physical and mental strain that contest preparation can put one through. However, I think another competitor at the gym I trained at summed it all up best when he told me, "I was in the marines. I did boot camp for 6 weeks and it didn't hold a candle to how hard preparing for a contest was."
    Truly, competitive bodybuilders are a different breed. Lack of information about how to properly prepare for a contest also hinders many competitors. More information is easily available for non-competitors than for those that take the plunge to compete. This article will provide competitors information on diet, training, tanning, posing, and other competition related topics.

    Pre-Contest Dieting

    Obviously the most pertinent issue regarding pre-contest preparation is the diet aspect of preparation. It is not enough to just clean up what you eat, it must be far more drastic than that. When you see the winner of a bodybuilding competition onstage, rest assured they tracked their calories, carbs, proteins, fats, and never missed meals. If you want to do well in a bodybuilding competition, you should expect to do nothing less.

    Before I begin talking about a proper pre-contest diet, we need to examine exactly how long a person should diet for a contest. The first thing that should be done is an "assessment" of your body. Look yourself over and be honest about your faults, strengths, and about how long you think it will take for you to get into stage shape.
    Keep in mind that if you think you have around 25 lbs of fat to lose, you are not going to be able to lose it all in 10 weeks and keep all of your lean body mass. Aim to diet as slowly as possible. The severity of your calorie deficit will, to a large extent, determine how much muscle you retain/lose. Short periods of high severity dieting (more than 1000 kcals per day below maintenance level) are not too muscle wasting, but prolonging them for more than a few days will certainly cause one to lose a good deal of muscle.
    As a general rule of thumb, losing 1 lb of bodyweight per week will allow one to retain most of their muscle mass. One can probably lose up to 1.5 lbs per week and retain most, if not all of their muscle mass (provided their training and nutrition are optimized).
    If one tries to push their body to lose more than 2 lbs per week for any length of time, then they will begin to experience quite a bit of muscle loss. It is for this reason that I usually try to give myself enough time so that I only need to lose 1-1.5 lbs per week at most.
    If one is naturally ectomorphic (has an easy time losing weight) however, they may want to diet for a shorter period of time, and I would recommend a time period of 11-15 weeks. If one is naturally endomorphic (has a hard time losing weight), then they may want to lengthen their dieting time to 16-22 weeks. If this is the first time that you have ever done a contest then you would want to also give yourself an extra week as you will probably experience a hitch at some point along the way.

    Diet Information

    The diet that one follows for their contest will be the single most important determining factor of how well they will place in the competition. A person can have all the mass in the world but if they do not come in razor sharp on contest day, then the mass will mean little.
    Judges almost always go for conditioning over size. To design a proper diet one should give themselves adequate time to lose the necessary body fat to achieve that aforementioned shredded look. Being said, what kind of diet is optimal for a person to follow?
    Well The Diet Should Have Three Main Goals:
    Spare as much muscle mass as possible.
    Lose as much fat as possible.
    Not cause the person to lose intensity in the weight room.
    Unfortunately, these goals all seem to contradict each other. When the body is in a starved (calorie deficit) state, muscle loss can occur although a calorie deficit is required to lose fat. This calorie deficit will also cause one to feel less energetic. To get around the negatives, there are small adjustments and little tricks to aid in the accomplishment of the positives. Before discussing the diet, it is important to discuss the three macronutrients and their roles.


    Protein is probably the single most important macronutrient for the purposes of maintaining muscle on a diet. Dietary protein is hydrolyzed (broken down) into it's constitutive amino acids during digestion. These amino acids are released into the bloodstream where they may then be taken up by cells (usually muscle cells).
    Dietary protein is also very important as amino acid availability is the single most important variable for protein synthesis to occur. This means that protein synthesis increases in a linear fashion (directly proportional to plasma amino acid concentrations) until the plasma amino concentrations are approximately twice that of normal plasma concentrations 1.
    To generalize for the less scientifically inclined, ingesting enough dietary protein is very important for someone who is looking to gain muscle, or maintain it while dieting. Dietary protein spares muscle by helping increase protein synthesis (and thus induce net muscle gain) and by acting as a muscle sparing substrate as it can be used for glucogensis (synthesis of glucose).
    Dietary protein however, is not as muscle sparing as are carbohydrates when used as a substrate for glucose synthesis. Protein is also a very "expensive" molecule for your body to use as energy. The body would much rather store amino acids than oxidize them as protein oxidation yields less net ATP produced per amino acid when compared to fat or carbohydrates2. Therefore, it can be stated that dietary protein has a thermogenic effect on the body.


    Carbohydrates have probably gotten the worst reputation of the macronutrients due to the ketogenic dieting rave. Ketogenic dieting refers to reducing carbohydrate intake to practically nothing, while simultaneously raising fat and protein intake. With little glucose for the brain to utilize for energy, the body will begin producing ketones.
    Ketones are by-products of fat oxidation and the brain can use ketones for energy. This does indeed have a potent fat burning effect, as insulin levels will be severely reduced due to lack of carbohydrate intake. Low insulin levels correlate with high rates of fat oxidation.
    Indeed, the ketogenic diet may be the single best way to lose the maximum amount of body fat in the shortest amount of time. However, if you will quickly refer to our goals during a pre contest diet you will notice that maintaining muscle is number one on our list, with fat loss second.
    If one has not properly scheduled enough time to lose body fat and they are in need of drastic measures, then using a ketogenic diet may be their only choice in order to become contest-ready in time. Unfortunately, they will not maintain an optimum amount of muscle mass.
    For those who have given themselves ample time to prepare, I do not suggest using a ketogenic diet. Instead, I recommend reducing carbohydrates, but keeping them high enough to possess the muscle sparing benefits of carbohydrates while still losing body fat.
    There are several main reasons that I recommend retaining carbohydrates. The first reason being that carbohydrates are much more muscle sparing than fats during times of stress when glucose becomes a primary source of fuel (i.e. anaerobic exercise, injury, infection, etc) 3.
    The muscle sparing effects of carbohydrates occur via several different mechanisms. When the body is in a low energy state, it may try to produce energy by converting amino acids to glucose. Carbohydrates prevent this since they can be easily broken down (and converted if need be) to glucose molecules. Carbohydrates then spare dietary protein from oxidation and these proteins can be stored rather than oxidized.
    Carbohydrates are also very muscle sparing during exercise. When one lifts heavy weights, the primary pathway that is used to produce ATP (cellular energy currency) is the anaerobic or glycolytic pathway (as the name implies this pathway operates in the absence of oxygen). The only substrate for this pathway is glucose, which can be obtained from dietary carbohydrates or by breaking down glycogen (the cell's stored form of glucose).
    If one is on a ketogenic or extreme "low carb" diet however, the body will need to utilize another source to synthesize glucose from. Since glycogen levels are low on a ketogenic diet, the body will actually convert amino acids to glucose and this glucose will be used in the anaerobic pathway to produce ATP. These amino acids will come from dietary protein, amino acids from the cellular amino acid pool, and from muscle tissue. The latter situation is where one would experience muscle loss. Dietary protein would be sacrificed for ATP production and the depleted amino acid pool would not bode well for protein synthesis rates, thus causing a net loss in muscle mass.
    Carbohydrates are also muscle sparing because they are a cause of insulin release. Now I know your thinking, "but Layne, you just said in your intro that low insulin levels were great for fat burning!?" Yes, you are correct. I did indeed say that low insulin levels are good for fat burning. Insulin inhibits lipolytic (fat burning) activity and must be kept low if one wishes to burn a maximal amount of fat.
    However, the pesky re-occurring theme of maintaining muscle prevents us from totally excluding insulin from our pre-contest diet arsenal, as insulin happens to be one of the most anabolic/anti-catabolic hormones in the body. Insulin binding to the cell membrane causes all sorts of reactions in your body that are beneficial to maintaining and gaining muscle tissue. Insulin inhibits protein breakdown and amino acid oxidation, thus promoting muscle maintenance or gain 1,2.
    Insulin also has an antagonist (inhibitory) affect with regards to several catabolic hormones, including cortisol. Cortisol is a hormone that is released during times of stress such as dieting, lifting, injury, etc. Cortisol produces glucose by breaking down proteins, including muscle tissue. Cortisol is the primary catabolic hormone that is released when one lifts or does any kind of activity.
    Insulin release inhibits the activity of cortisol by preventing its release from the pancreas, thus sparing muscle tissue from cortisol's catabolic effects. Furthermore, it is interesting to note that long-term exposure of cells to ketones (i.e., ketogenic diet) retard insulin-induced activation of the insulin surface receptor 4. This causes one to become extremely sensitive to carbohydrates when they begin ingesting them again after they finish dieting and could lead to an undesired post diet fat gain.
    Carbohydrates act to maintain muscle mass while dieting by maintaining cellular osmotic pressure and cell volume. Cell size is an indicator of the "state" that the body is in. When cells are of large volume, it signals that the body is in a fed state. When cell volume is low it signals that the body is in a starved state. Without delving too far into the science behind this, trust me when I say that you would like your body to think it is in a fed state as this will increase the levels of fat burning hormones and anabolic hormones.
    Cell size also indicates the anabolic state of the cell. When cell volume is high, protein synthesis rates increase. If cell volume drops, then protein synthesis levels drop 5,6,7,8. It is easy to infer we would like to maintain cell volume, especially when dieting. The problem with extreme low carbohydrate diets is they cause severe reduction in cell size.
    The body stores carbohydrates inside cells as glycogen. For every gram of glycogen stored, the body stores around 2.7 g of water. Therefore, cells that have greater glycogen levels will also have more volume. One can see then how low carbohydrate diets severely decrease cell size due to severe glycogen depletion. Concluding, carbohydrates help maintain muscle by increasing cell volume.
    One more issue to consider is performance. If you refer to the goals of a pre-contest diet, you will see that number three maintains that you must keep a high level of intensity in the gym. This is important for several reasons. If performance begins to suffer, then a person will undoubtedly lose strength. This could lead to a subsequent loss of muscle mass due to decreased stimulation from a decreased training overload. Therefore, it is important that performance be kept at an optimal level.
    Low glycogen levels have been associated with increased fatigue and decreased performance in athletes (endurance, strength, power output, etc). Several studies have shown that consuming adequate amounts of carbohydrates before, during, and after exercise may attenuate the increased fatigue and increase performance.9-14
    It is worth noting that one such study concluded that "the rate of recovery is coupled with the rate of muscle glycogen replenishment and suggests that recovery supplements should be consumed to optimize muscle glycogen synthesis as well as fluid replacement." It can therefore be concluded that an adequate supply of carbohydrates is crucial for maintaining performance and for proper muscle recovery.


    Fats are very important molecules and are considered essential to ones survival. Indeed, fats are involved in many of the body's processes which are required for survival. Several key functions of fats in the human body are for energy storage and hormone synthesis. They are the body's preferred source of stored energy and the most efficient molecule for the body to burn. (in terms of energy yield per gram, 9kcals/gram).
    The main hormone that fats impact which we are concerned with is testosterone. When calories are restricted, testosterone levels will drop, as the body will suppress its release of anabolic hormones in order to spare nutrients for oxidation (energy production). This makes perfect sense: the body senses it is "starving" and thus it represses it's anabolic hormones to prevent nutrients from being used to increase tissue mass and spares them for energy production.
    That's the first hit against testosterone production. Drastically lowering your fat intake is another hit against testosterone production since fatty acids are the substrates for cholesterol synthesis and therefore are also the substrates for testosterone synthesis (cholesterol is converted to testosterone, among other things).
    Unfortunately, fats are also easily stored as adipose tissue (body fat) So there must be some type of comprimise between ingesting enough fat for hormone maintenance (and subsequent muscle maintenance) and reducing fat intake enough to decrease body fat.
    There has been some research done on the effects of dietary fat on testosterone. The answer to, "how much dietary fat is optimal" is difficult to decipher, as there are major differences in the designs of the performed studies. This makes it difficult to compare them to each other and come up with a "standard" answer.
    Several studies concluded that diets low in fat (under 15% of total calories) significantly decreased testosterone levels while diets higher in fat (above 30% of total calories) increased serum testosterone levels.15, 16 Rather than continuing with this discussion I will provide a link to an article which covers the subject quite nicely.
    To simplify everything that I have said, it seems that one should not lower fat below 15% of daily calories unless they would like to face extreme testosterone deficiencies. Likewise, one should not increase fat to say 40% in order to increase testosterone.
    Although fat increases testosterone to a degree, it is important to remember that testosterone is only a small piece of the larger puzzle. There are many other hormones and factors involved in building muscle other than just testosterone. By increasing fat to extremely high levels, there will be less "space" for carbohydrates and protein, both of which are very important for aforementioned reasons.
    As with most things in life, moderation is key. In order to keep hormone production regular and fat burning in high gear, while allowing enough "space" to supply adequate carbohydrates and protein for muscle sparing purposes I do not recommend increasing fat above 30% of daily calories.

    The Diet

    In order to come up with macronutrient totals for a diet, it is necessary to assess how many lbs per week one will need to lose to be in contest shape. This is not an exact science, however we can still get a reasonable experience-based estimate. Here are some example calculations so that you may have an understanding of how to go about doing this.
    For example, we have a subject who is a mesomorph weighing 200 lbs and has 13% bodyfat. Since 3-4% is considered "stage condition", that means the subject will need to drop roughly 10% body fat which equates to about 20 lbs. To recapitulate, I do not recommend dropping weight any faster than 1-1.5 lbs per week. Since 20 weeks is a long time to diet, let's have the subject lose about 1.5 lbs per week.
    I recommend that one lose approximately 80% of their weight due to calorie restriction and 20% of their weight due to cardio (someone who is ectomorphic should do less cardio, while someone with an endomorphic build should do more cardio). To lose 1.2 lbs (80%) per week from diet, there must be a 600 kcal per day deficit from diet. To lose the other .3 lbs (20%) per week from cardio, one should perform 3 cardio sessions per week, which burn 350 kcals per session.
    The best way to determine one's caloric intake required to lose fat at a certain rate is to chart calorie intake for a period of a few weeks and try to determine at what level the subject does not gain weight (this is the caloric baseline). For those who do not exercise this method, a rough estimate can be made using the following strategy.
    Utilize The Subsequent Equations To Find Your Caloric Baseline:
    • Mesomorphs - bodyweight x 15.
    • Ectomorphs - bodyweight x 16-17.
    • Endomorphs - bodyweight x 13-14.
    So for our subject; 200 X 15 = 3000 kcals per day. This is the subject's caloric baseline (roughly). So if he wishes to lose 1.2 lbs per week from dieting (caloric restriction of 600 kcals per day); 3000 - 600 = 2400 kcals per day.
    Meal Frequency Is As Follows:
    Mesomorphs - eat every 2.5 - 3.5 hours.
    Ectomorphs - eat every 2 - 3 hours.
    Endomorphs - eat every 3.5 - 5 hours.

    Protein Intake
    The "golden standard" protein intake for a bodybuilder is around 1 g/lb of bodyweight. This will need to be increased while dieting. Protein is a thermogenic macronutrient key in sparing muscle tissue when in a caloric deficit (see aforementioned section on protein). I recommend the following protein intakes for different body types:
    Mesomorphs - 1.2g/lb - 1.3g/lb.
    Ectomorphs - 1.4g/lb - 1.6g/lb.
    Endomorphs - 1.4g/lb - 1.5g/lb.*
    For our subject, this equates to a protein intake of around 240-260 g protein per day. Let's go 'middle of the road' and set the subjects protein intake at 250 g protein per day. This means 1000 kcals have been devoted to protein intake, leaving us with 1400 kcals for fat and carbohydrate intake.
    Fat Intake
    Fat intakes are as follows:
    Mesomorphs - 17% - 23% of total calories.
    Ectomophs - 24%-28% of total calories.
    Endomorphs - 23%-28% of total calories (fat intake is increased in order to reduce carbohydrate intake, as endomorphs may have a difficult time losing fat with higher carbohydrate intakes).
    For our subject, this equates to about 400 - 550 kcal from fat per day (45g - 60g fat per day) Once again, I prefer the 'middle of the road' approach and would set his fat intake at around 55g fat per day (495 kcals/day from fat) .
    Carbohydrate Intake
    Whatever calories that have not been allotted to protein and fat intake will make up total daily carbohydrate intake. For our subject in question, this leaves 2400 (1000 + 495) = 905 kcals per day for carbohydrate intake. This equates to 225g of carbohydrates per day.
    * I recommend a higher protein intake for endomorph's while dieting because of the thermogenic effect of a higher protein intake and increased protein turnover, not because they need more protein to maintain muscle mass.


    One should also incorporate re-feeds into their diet plan. Re-feeds help boost a hormone called leptin, which is the mother of all fat burning hormones. As one diets, leptin levels drop in an attempt by the body to spare body fat. Periodic, proper re-feeding can raise leptin levels and help one continue to burn fat an optimum rate.
    A person who is lean will need to re-feed more frequently than someone who has a higher body fat percentage. For those who are below 10%, it is probably a wise idea to incorporate re-feeds two times per week. For those people who are in the 10-15% range, re-feeding every 6-12 days will probably be adequate, for those who are above 15%, re-feeding will probably not need to be done more than once every week to two weeks. Obviously as one loses body fat they will need to re-feed more often.
    Re-Feed Days Should Be Planned As Follows:
    • Re-feed on the day you work your worst body part(s) as re-feeding will not only raise leptin, but be quite anabolic.
    • Keep fat as low as possible during re-feed days as high insulin levels will increase dietary fat transport into adipose tissue. In addition dietary fat has little to no impact on leptin levels.
    • Reduce protein intake to 1 g/lb bodyweight.
    • Consume as little fructose as possible as fructose does not have an impact on leptin levels.
    • Increase calories to maintenance level (or above if you are an ectomorph) and increase carbs by at least 50-100% (endo's stay on the low end, while ecto's should stay on the high end) over normal diet levels.

    Nutrient Timing

    As previously discussed before, carbohydrates cause insulin release, which is very muscle sparing, but also very anti-lipolytic. It is therefore important that we construct a diet so that we intersperse long periods of low insulin levels in order to maximize lipolysis, coupled with short periods of high insulin levels to protect muscle when it is at the greatest risk of catabolism.
    There are essentially two crucial times during the day when muscle tissue is at the greatest risk of catabolism. The most crucial time is during your workout. As many of you already know, working out is actually catabolic. When one is in a calorie deficit, the catabolic effect of working out is enhanced, as the body will attempt to raise low glucose levels by de-aminating amino acids and converting them to glucose.
    One of the main hormones that control this action is cortisol. Unfortunately this is quite catabolic as some of these amino acids may come from muscle tissue (See carbohydrates section). It is crucial that one consumes carbohydrates before exercise for several reasons.
    • Dietary carbohydrates will provide fuel for the anaerobic pathway, and spare muscle tissue from being converted to glucose for fuel.
    • Dietary carbohydrates will cause the release of insulin, which blocks the release of cortisol from the pancreas.
    • Dietary carbohydrates will increase muscle glycogen levels which will improve performance and decrease fatigue.
    I suggest one consume 35% of their total daily carbohydrates in a meal 1.5 to 2 hours before their workout as this will allow the carbohydrates adequate time to be digested and enter the bloodstream.
    I also suggest consuming a shake composed of 30-40g of whey protein along with dextrose or maltodextrin during their workout. The carbohydrates in the shake should account for about 20% of one's total daily carbohydrate intake.
    This Shake Will Have Several Benefits:
    Spare muscle glycogen and increase performance.
    Spare muscle tissue.
    Maintain a constant release of insulin, therefore inhibiting cortisol release.
    The continuous ingestion of carbohydrates will ensure that adequate substrate is available for the glycolytic pathway.
    It is also a wise idea to consume a post workout meal composed of whole food, low GI carbohydrate sources (although one may consume another protein shake if they feel so inclined) about 30 minutes after finishing the in workout shake.
    This low GI carbohydrate should contain about 25% of your total daily carbohydrates and will help stabilize blood sugar levels. You see, dextrose causes a very large insulin spike, and actually can cause insulin to be over secreted, when insulin is over secreted, blood sugar levels will drop rapidly as insulin disposes of the glucose into the tissues and one may even begin to experience hypoglycemia (low blood sugar).
    Low blood sugar may lead one to experience an increase in hunger. A lower GI carbohydrate and protein meal post workout will help counteract this negative effect by stabilizing blood sugar levels.
    The other time of day when one should consume a meal containing carbohydrates is upon rising. Waking up is actually a stressful time on the body and in an effort to "ready itself" the body releases several catabolic hormones in order to produce energy for the fasted person.
    The main two hormones released are cortisol and glucogen both of which can be catabolic to muscle tissue. Consuming a carbohydrate meal will retard the release of these catabolic hormones and spare muscle tissue. It will also make you feel better by providing fuel for your brain to run on.
    There is some anecdotal evidence that suggests consuming a meal containing carbohydrates may also help suppress hunger later in the day. I suggest consuming 15% of your daily carbohydrate intake at this meal in the form of low GI carbohydrates. The remaining 5% of your total daily carbohydrates should come from veggies throughout the day such as salad, broccoli, peas, etc.
    If you happen to workout after breakfast, merely combine breakfast and your pre workout meal. Thus 35% + 15% = 50% of daily carbohydrate intake should be in pre workout/breakfast meal
    During these high carbohydrate meals one should aim to keep fat as low as possible. High insulin levels increases fatty acid transport into adipose tissue, so it is a good idea to keep your fat low during times of high insulin. You should spread your remaining fat intake evenly over the rest of your low carbohydrate meals. Protein intake should be spread fairly evenly over all of your meals.

    The Following Is A List Of Acceptable Protein, Carbohydrate, & Fat Sources While Dieting:
    • Tuna or most any fish.
    • Cottage cheese.
    • Eggs (especially the whites).
    • Chicken breast (boneless skinless).
    • Turkey breast (boneless skinless).
    • Lean beef.
    • Low fat or no fat cheese.
    • Low fat pork.
    • Milk protein isolate.
    • Whey protein.
    • Soy protein.
    • Essentially most any other source of protein so long as it is low in saturated fat and carbohydrates.
    • Sweet potatoes.
    • Oat meal, oat bran, oat bran cereal (i.e. cheerios).
    • Bran cereal.
    • Brown rice.
    • Wheat bread (try to limit to 2 slices per day).
    • Beans.
    • Low fat popcorn (low fat butter spray makes this a delicacy).
    • Fruits (limit to 2-3 servings per day).
    • Malto dextrin (during workout).
    • Dextrose (during workout)
    • Vegetables.
    • Stay away from refined grains and anything that says "enriched" or "high fructose corn syrup" on the label!
    • Omega 3 capsules (i.e. fish oil capsules).
    • Flax seed oil.
    • Primrose oil.
    • Borage oil.
    • Olive oil.
    • Nuts (limit to 1 serving per day), peanut butter (as long as it does not contain hydrogenated oils).
    • Egg yolks.
    • Fish (salmon especially).
    • All other fat should come as a by-product of your carbohydrate and protein intake.


    Perhaps the most dreaded word in a bodybuilder's vocabulary is "cardio." Unfortunately, cardio is a necessary evil of pre contest prep for most people. Few are able to achieve contest bodyfat levels through diet alone (i.e. ectomorphs with extremely fast metabolisms).
    In men, cardio increases lipolysis in visceral fat (surrounding organs), especially in the stubborn abdominal area. In women, cardio increases lipolysis in the stubborn subcutaneous buttocks and thigh area in women. This is due to innervation and blood flow, which aerobic activity influences much more than diet alone 17.
    Cardiovascular exercise has several myths surrounding it. The largest myth being that one should perform low intensity cardio in a fasted state. The logic being that if one is in a fasted state, their glycogen levels will be low and will force their body to burn fat. Unfortunately, this idea is misguided.
    While performing cardio in a fasted state may indeed increase the amount of calories that are burned from fat stores, it will also increase amino acid oxidation. Cardiovascular exercise while in a fasted state is a great way to increase cortisol release. Cortisol will liberate amino acids to produce glucose (glucose cannot be synthesized from fats) and can lead to muscle loss.
    Additionally, I find it ironic that many people take such great care to time their meals so that they do not go for more than 2-3 hours without eating in order to prevent muscle loss. However, they purposefully induce this state and then perform work on top of this!
    Research has shown that the type of substrate used during cardiovascular work makes little overall difference on fat loss. This is most likely due to the fact if one relies mostly upon fat stores during cardio (i.e. low intensity cardio), the body will burn predominantly glucose at other times of the day. Likewise, if one mainly utilizes glucose for energy during cardio (i.e. high intensity cardio) the body will customarily rely on fat at other times of the day in order to spare muscle glycogen.
    Training in and of itself causes the body to preferentially spare muscle glycogen and burn fat. It makes sense that one should strive to do their cardio on their 'off days' from lifting (as to not further hinder their recovery), and plan their carbohydrate intake similar to their lifting regime.
    Cardiovascular work will increase nutrient partitioning towards muscle tissue and away from fat tissue. One should take advantage of this by consuming the bulk of their carbohydrate intake around this time. The benefits are that these nutrients induce fat storage, but will rather be stored in muscle tissue.
    Why would you want to deny your muscles nutrients at the most crucial time of the day, but then provide them during rest? It does not make sense. Treat your cardiovascular work like your lifting.
    Another question that often arises regarding cardio is the argument "Low-Intensity vs High-Intensity" cardio. Many people automatically assume that low-intensity cardio is better; citing that high-intensity cardio primarily utilizes glucose (anaerobic metabolism), while low-intensity cardio primarily burns fat (aerobic metabolism).
    Once again, the substrate used during cardiovascular work is not as important as the caloric deficit created by the cardiovascular work. In actuality, high-intensity cardiovascular work is superior to low-intensity cardio for several reasons
    High intensity cardio has a much stronger effect on GLUT-4 translocation in muscle cells due to the increased force of muscle contraction. This means that high-intensity cardio creates a much stronger nutrient partitioning effect towards muscle tissue than low-intensity cardio.
    Low periods of low-intensity exercise tend to "overtrain" the fast-twitch muscle fibers and convert the intermediate muscle fibers to slow-twitch fibers. This is not a desirable effect as the fast twitch muscle fibers are those that have the greatest chance to hypertrophy. If your body has less fast twitch fibers, then you will experience less hypertrophy from training.
    The body's hormonal response to high intensity cardio is similar to the body's hormonal response to resistance training (i.e. increased insulin sensitivity, gh release, Igf-1 release, etc) without placing the same strain on the nervous system as resistance training.
    High-intensity cardio causes the body to preferentially store more carbohydrates and burn more fat.
    High-intensity cardiovascular exercise increases oxygen expenditure and forces the body to adapt by becoming more efficient at oxygen transport (increase in VO2 max). More efficient oxygen transport to the muscles will increase fat oxidation as fat oxidation is dependant upon the presence of oxygen.
    High-intensity cardio seems to be more muscle sparing. Several studies have shown that high-intensity interval training (aka HIT) burns less calories when compared to continuous lower intensity cardio. However, the skinfold losses were greater with the HIT group than in the continuous intensity group. This means not only did the HIT group lose more fat, they also spared more muscle tissue by burning less overall calories .
    At this point I am going to refer you to several articles that I think are some of the best I've seen regarding cardiovascular work. I urge you to read them as they will re-emphasize what I have already stated, as well as help you gain a further understanding of how cardiovascular work effects your metabolism.
    (if you only read one article READ THIS ONE!)
    I also implore you to read this thread from the bodybuilding.com message boards as it may help you better understand the subject and or answer any questions you might have.
    In conclusion, I suggest performing HIT cardiovascular work on their off days only. One should treat this cardio session like a weight session and eat accordingly (as outlined in the diet section). If you must perform cardio on your lifting days then do it on the day you train your weakest body part and divide up your carbohydrate intake in view that you leave enough carbohydrates for both pre/post lifting and cardio.
  2. iwishiwascool

    iwishiwascool Lurker

    Oct 23, 2003
    Likes Received:
    Columbus, Oh
    good article.

    Things I was already aware of, as my diet reflects... but it is good to know the specific processes of the body that influence the typical stratigies Ive learned.
  3. Leo95SE

    Leo95SE The OMINOUS one

    Mar 16, 2000
    Likes Received:
    over there, no here
    glad to see someone got some benefit :/
  4. iwishiwascool

    iwishiwascool Lurker

    Oct 23, 2003
    Likes Received:
    Columbus, Oh
    too much reading for most.
  5. Psyc0

    Psyc0 TTKA

    Feb 6, 2005
    Likes Received:
    good article... only problem is where it suggests that low intensity training with "overtrain" your fast twitch muscle fibers (type II) and convert them to slow-twitch (type I) which in actuallity is impossible. Fibers cannot be changed between type I and type II however they can be switched from Type IIb to Type IIa, a I believe is more like a type I muscle fiber but still hypertrophies the same as other Type II fibers.
  6. Drewski

    Drewski New Member

    May 22, 2002
    Likes Received:
    Scarberia aka Scarlem, ON
    good post. this will be my cardio reading for the day :bigthumb:
Thread Status:
Not open for further replies.

Share This Page