Patent Application
20130203645
The present invention relates to a method and program of improving muscle protein synthesis. In particular, the invention relates to the improvement of muscle protein synthesis in an individual doing physical exercise.
Physical exercise alters the activity of proteins involved in ‘turning on’ protein synthesis (i.e. signalling molecules) which helps guide which muscle proteins are to be made and when. Similar to the molecular responses, the changes in protein synthesis after a single bout of exercise are largely specific to the exercise task, such as an increased synthesis of proteins involved in strength (i.e. myofibrillar) with resistance exercise and an increase of proteins involved with energy supply (i.e. mitochondrial) with aerobic exercise (Coffey V G, and Hawley J A. The molecular bases of training adaptation. J Sports Sci 2007). However, beyond pure endurance/aerobic exercise and pure resistance exercise, current state of the art dictates that there is no idea what proteins will be synthesized after a bout of repeated sprints exercise, similar to what team sport athletes undertake in training and competition.
For physical exercise overtime, these changes in signalling molecule activity and muscle protein synthesis summate over a period of weeks to months (i.e. with training) into physiological adaptations that make an athlete better at a specific exercise task/event.
There is very little information regarding what and how nutrition can support and optimize these training adaptations. In fact the mentioned 2007 extensive review on training adaptation “The molecular bases of training adaptation” does not discuss the role that nutrition plays in supporting or enhancing the adaptation to training. Furthermore, some exercise tasks have both a resistive as well as an aerobic component (eg. sprint-type stop-and-go commonly seen in team sports) and therefore it is completely unknown what changes occur in the molecular signalling as well as the synthesis of different muscle proteins.
There are three main different types of exercise training regimes which include: 1) resistance exercise 2) anaerobic or repeated sprint type exercise and 3) endurance exercise. Each of these exercise training regimes features a divergent training response.
Recent studies have look at the adaptation to repeated sprint training and found that type IIa fibers increase, along with increases in both mitochondria and also some hypertrophy, and increases in the lactate transporters 2. (Gibala M J, et al. Short-term sprint interval versus traditional endurance training: similar initial adaptations in human skeletal muscle and exercise performance. J Physiol 575: 901-911, 2006).
In addition, it is unknown how nutrition can enhance these adaptations after sprint-type exercise. There is a need for understanding examining the acute effects of nutrition supplementation on molecular signalling and protein synthesis after repeated sprint based exercise, such as the majority of team sport sports, like football/soccer.
Current during and post-exercise nutrition recommendations for sprint type of sports involve the ingestion of adequate carbohydrates to replenish muscle glycogen.
There is a need to determine the importance of other nutrients and timing of intake to enhance muscle adaptations to sprint-type/stop-and-go exercise.
The present invention seeks to address the above-described problems. The invention also aims at other objects and particularly the solution of other problems as will appear in the rest of the present description.
In a first aspect, the invention provides method of enhancing muscle protein synthesis following physical exertion comprising administering to a human a composition comprising protein or essential amino acids and carbohydrates 30 minutes or less prior to, during, or within 30 minutes after running repeated sprints, such as normally found with the majority of team sports.
It has surprisingly been found that the addition of protein or essential amino acids with repeated sprint exercise has the capacity of enhancing myofibrillar protein synthesis. Myofibrillar protein is the specific protein responsible for muscle hypertrophy (growth).
Physical exercise provides a stimulus to the body that triggers a cascade of molecular signals that lead to changes in gene expression and the synthesis of proteins specific to the exercise stimulus. The physical adaptation that results from chronic training is believed to be a direct result of the accumulation of these proteins after multiple bouts of acute exercise.
A clear beneficial effect is shown on anabolic signalling and muscle protein synthesis following repeated sprint based exercise with nutrients provisions. Recommendations are to take protein and carbohydrate in close temporary timing to strenuous training sessions. There are well documented advantages of supplementation of nutrients after resistance and endurance training, but not with repeated sprints.
It has further been found that, the absence of nutrient provisions in close proximity to high-intensity sprint workout indeed is likely to impair subsequent training adaptations since the muscle protein synthesis during recovery was nearly 50% greater with nutrient provision as compared to the placebo condition which had no nutrient provision (see example details from the report
It has also been found that when nutrition can improve the adaptations to a single training session by only a small percentage over a period of weeks or months this could have a major effect on training adaptations and thus performance.
In a second aspect, A program for enhancing muscle adaptation resulting from repeated sprints training, the program comprising providing nutrition and guidance on training to an athlete to improve the muscle protein synthesis, the program comprising:
In a further aspect, the invention relates to a nutritional kit comprising a plurality of compositions comprising protein or essential amino acids and carbohydrates and guidelines recommending that an athlete consume the composition within a certain time period before exercising and within a certain time period during recovery after repeated running of sprints. The invention also relates to a use of a composition comprising protein or essential amino acids and carbohydrates for improving muscle protein synthesis wherein the use is in connection with repeated sprint exercise.
Furthermore, as described above, repeated sprint type training is anaerobic in nature, and involves nearly purely carbohydrate metabolism with a large breakdown in muscle glycogen. Accordingly, nutritional recommendations are for at least 1 to 1.5 g of carbohydrate per kg body mass (a total of ˜50 to 75 g carbohydrate) to be consumed in the first several hours after this type of exercise training.
Further features, advantages and objects of the present invention will become apparent for the skilled person when reading the following detailed description of embodiments of the present invention, when taking in conjunction with the figures of the enclosed drawings.
According to the invention, nutrient provision increases anabolic signalling and myofibrillar protein synthesis after repeated sprint exercise
It is commonly recommended that athletes involved in sprint-type exercise consume adequate carbohydrate to enhance glycogen resynthesis and energy recovery. Our data demonstrate for the first time the importance of protein ingestion in close proximity to a bout of sprint-type exercise in order to maximize myofibrillar protein synthesis, which does not occur with carbohydrate ingestion alone. In fact we found a 48% increase in myofibrillar protein synthesis after protein+leucine intake as compared to isocaloric carbohydrate only trial. In addition, proteins involved in ‘turning on’ protein synthesis are also enhanced with protein ingestion after exercise demonstrating a clear link between the signals to activate protein synthesis and the subsequent muscle protein synthetic response (e.g. ˜300% increase in p70S6kinase and a ˜100% increase in 4E-BP1). The activation of p70S6kinase has been shown to be important for the acute increase in muscle protein synthesis and the chronic increase in muscle growth with training. Therefore, overtime this continual timed ingestion of protein with sprint-type exercise will lead to greater muscle growth and muscle power with training; this is a very favourable adaptation for athletes engaged in this type of exercise/sport.
In order to maximize muscle protein synthesis and enhance adaptations to sprint-type exercise (eg. team sport stop-and-go) it is recommend that athletes consume a product that contains 20-35, preferable from 20 to 30 g of protein with added leucine (up to 5 g) in close proximity to (i.e. 30-60 min before and/or 0-120. Advantageously, within 0-30 min of the exercise. These nutritional guidelines would apply to all stop-and-go individual and team sports that are characterized by periods of high intensity sprints interspersed by periods of low-intensity recovery (eg. football, tennis, ice hockey, basketball, etc.).
It is preferred that the composition comprises carbohydrates and protein or essential amino acids in a carbohydrate to protein ratio in the range from 1:1 to 3:1, preferably in a ratio of 2:1.
Advantageous to maximize post-exercise glycogen resynthesis, for carbohydrate intake, the recommendation would be 1 to 1.5 g CHO/kg.
The preferred composition comprises a total protein dose of 10 to 50 g protein, preferably 20 to 30 grams. In the use according to the invention this is the preferred amount.
In an embodiment, the protein or amino acid constitute about 20% to about 40% by weight of the solids in the final product. In another embodiment, the protein or amino acid comprises about 30% by weight of the product.
Moreover, the composition can be made so that there is a consistent and countable quantity of protein per single dose, for example, between about 2 grams to about 4 grams per dose.
Preferably, the composition comprises a protein or essential amino acid content of about 2 grams to about 2.5 grams.
The composition may be in the form of a solid product, a gel, a liquid, or a ready to mix powder.
The protein-based product can also contain a discrete amount of fat in one or more products to provide any suitable amount of energy to an athlete. For example, each of the products can provide a fat amount up to 9 g/300 cal. In another example the products can provide 11 g/360 cal. Each of the products can also provide a saturated fat amount up to 4 g/300 cal or more. In an embodiment, the percentage of energy (e.g. in the form of calories) coming from fat can be up to about 25%.
In an embodiment, the protein-based product comprises an amount of fat ranging from about 10% to about 40% by weight of the protein-based product. Preferably, the protein-based product comprises an amount of fat of about 30% by weight of the protein-based product.
Any suitable individual protein, amino acid or blends of proteins can be used. For example, the protein-based product can comprise a protein blend comprising soy protein isolates, whey protein isolates and calcium caseinate. An example of the protein blend is the Tri-source™ protein blend.
The presence of proteins and/or fats in the nutritional product of the present disclosure has the advantage in that it is possible to provide an athlete with a more complete nutrition during performance. For the protein source, any suitable dietary protein may be such as, for example, animal proteins (e.g. milk proteins, meat proteins and egg proteins); vegetable proteins (e.g. soy protein, wheat protein, rice protein, and pea protein); mixtures of free amino acids; or combinations thereof. Milk proteins, such as casein and whey milk proteins, and soy proteins are particularly preferred.
The proteins may be intact or hydrolysed or a mixture of intact and hydrolysed proteins. It may be desirable to supply partially hydrolysed proteins (degree of hydrolysis between 2 and 20%), for example, for athletes believed to be at risk of developing cows' milk allergy. Generally, at least partially hydrolysed proteins are easier and faster to metabolize by the body. This is in particular true for amino acids. In an embodiment, the protein-based product contains single/essential amino acids such as, for example, leucine, valine and/or isoleucine.
In a preferred embodiment of the invention the essential amino acids comprising added Leucine. In the present context Leucine is an essential amino acid (EAA), found as part of the family of branched chain amino acids (BCAA). Ingestion of essential EAA stimulates the synthesis of skeletal muscle proteins with the branched-chain amino acids leucine, isoleucine, and valine suggested to play a critical role in this response. Of the BCAA, leucine has been investigated for its anabolic properties in many different tissues, including muscle. It is well established in cell culture and rat models that leucine increases the formation, and hence activation, of specific proteins that are involved in “turning on” protein synthesis.
Advantageously, a total does of essential amino acid dose of 5 to 25 g blend of EAA that mimics the EAA in high quality proteins, preferably 10 g EAA in used in a product according to the invention. It may be advantageously to use leucine in total does up to 25 g.
The fat source has the advantage in providing for an improved mouth feel. Any fat source is suitable. For example, animal or plant fats may be used. To increase the nutritional value, n3-unsaturated and n6-unsaturated fatty acids may comprise the fat source. The fat source may also contain long chain fatty acids and/or medium chain fatty acids. For example, milk fat, canola oil, almond butter, peanut butter, corn oil and/or high-oleic acid sunflower oil may be used.
The repeated sprints exercise according to the invention are part of a sport, in either continual training for that sport, or in the competition itself.
To investigate the effect of timed nutrition (protein+leucine ingestion) on the changes in signalling molecule activity and muscle protein synthesis after repeated sprint-type exercise, a clinical trial was performed below.
The study employed a randomised, cross-over, double blind design incorporating diet and exercise manipulation. Subjects performed the same repeated sprint exercise protocol on two separate occasions with altered nutrient intervention (protein versus placebo) with each testing session separated by a two-week recovery period.
Subjects consumed 500 mL of either a beverage containing 24 g whey protein, 4.8 g leucine, 50 g maltodextrin (nutrients) or non-caloric placebo beverage 30 min prior to commencing the exercise protocol. Time-motion analysis of several major team sport performances indicates maximal sprint activity occurs every ˜50-100 s with sprint durations not exceeding 6 sec. Accordingly, in an effort to make the laboratory exercise simulation as “sports specific” as possible, subjects performed 10×6 s supra-maximal sprints beginning every 60 s at a load equivalent to 0.075 kp/kg body mass (BM) on an electronically-braked cycle ergometer.
Subjects rested comfortably in the supine position for 3 h after completion of the exercise bout. Muscle biopsies were taken from the vastus lateralis (thigh) to measure activation (as assessed by changes in phosphorylation) of proteins involved in “turning on” protein synthesis (i.e. regulate mRNA translation) by standard Western blotting procedures. Muscle (i.e. myofibrillar) protein synthesis was also measured by a primed constant infusion of a stable isotope amino acid (i.e. [ring-13C6]phenylalanine).
Blood Amino Acids (See
There were time×treatment interactions for plasma essential (EAA), branched-chain (BCAA) and total amino acid concentration (
| Number | Date | Country | Kind |
|---|---|---|---|
| 09177423.2 | Nov 2009 | EP | regional |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2010/068439 | 11/29/2010 | WO | 00 | 12/31/2012 |
