Study reaffirms soy-dairy protein blend increases muscle mass

Blend of high-quality proteins can prolong muscle building after resistance exercise, compared to whey alone

A new study published online in the Journal of Applied Physiology shows additional benefits of consuming a blend of soy and dairy proteins after resistance exercise for building muscle mass. Researchers from the University of Texas Medical Branch found that using a protein blend of soy, casein and whey post-workout prolongs the delivery of select amino acids to the muscle for an hour longer than using whey alone. It also shows a prolonged increase in amino acid net balance across the leg muscle during early post-exercise recovery, suggesting prolonged muscle building.

The study was conducted by researchers from UTMB in collaboration with DuPont Nutrition and Health. “This study sheds new light on how unique combinations of proteins, as opposed to single protein sources, are important for muscle recovery following exercise and help extend amino acid availability, further promoting muscle growth,” said Blake B. Rasmussen, chairman of UTMB’s Department of Nutrition and Metabolism and lead researcher of the study.

This new research, using state-of-the-art methodology, builds on an earlier publication reporting that a soy-dairy blend extends muscle protein synthesis when compared to whey alone, as only the blended protein kept synthesis rates elevated three to five hours after exercise. Together, these studies indicate that the use of soy-dairy blends can be an effective strategy for active individuals seeking products to support muscle health.

“Because of the increased demand for high-quality protein, this study provides critical insight for the food industry as a whole, and the sports nutrition market in particular,” said Greg Paul, global marketing director for DuPont Nutrition and Health. “With more and more consumers recognizing the importance of protein for their overall health and well-being, the results of this study have particular relevance to a large segment of the population, from the serious sports and fitness enthusiast to the mainstream consumer.”

The double-blind, randomized clinical trial included 16 healthy subjects, ages 19 to 30, to assess if consumption of a blend of proteins with different digestion rates would prolong amino acid availability and lead to increases in muscle protein synthesis after exercise. The protein beverages provided to study subjects consisted of a soy-dairy blend (25 percent isolated DuPont Danisco SUPRO soy protein, 50 percent caseinate, 25 percent whey protein isolate) or a single protein source (whey protein isolate). Muscle biopsies were taken at baseline and up to five hours after resistance exercise. The protein sources were ingested one hour after exercise in both groups.

The study demonstrates that consuming a soy-dairy blend leads to a steady rise in amino acids, the building blocks of muscle. The data showed that the soy-dairy blend yields an increase in select amino acid delivery for about an hour longer than the use of whey protein alone. The blend also sustained a greater positive net amino acid balance than whey, suggesting there is less muscle protein breakdown during the time period shortly after consumption of a blended protein product.

Further research is ongoing to identify the long-term effect on muscle mass and strength.

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5 thoughts on “Study reaffirms soy-dairy protein blend increases muscle mass”

  1. With the consumer market increasing as more people want to look good, be healthy and more competitive, the market is open to develop the ideal product in a capsule which provide the optimal benefit.

    More and more studies have proven not only regular and hard training, built muscle but a well-balanced diet and the use of supplements is just and even more important in building muscle. The reason studies from Prof Tim Nokes from the University of Cape Town where eating more proteins, fat and less carbs is going against what detritions believed in the past and being challenged by many.

    With research in different slow and fast protein release to optimise amino acids reaction the ideal combination is still to be found with only time required to proof effect. It is also crucial to see effect on different age groups as the body production change with age. The challenge will be between the combination of supplements, exercise and age.

  2. After my previous comment, I continued to research on this topic, because it intrigues me to great extent.
    It seems as though there are disadvantages to using soy,but the benefits far out way them. Not only do the benefits out way the disadvantages, it appears as though some of the disadvantages are said to be myths!
    According to similar studies to this one have been done before, and it is stated that Greg Paul, Ph.D., director of health and nutrition for The Solae Company, the results of these studies show that soy protein is just as effective as whey protein in building lean muscle mass as part of a dedicated exercise and nutrition regimen, while contradicting the myth that soy protein may negatively impact testosterone levels in men.
    Results are consistent with prior studies which have compared the effect of whey protein and soy protein on lean muscle mass, and supports the notion that dedicated athletes may benefit from a nutrition regiment that includes both soy and whey proteins.
    And it seems as though its working for the people who have commented earlier too. I’m eager to try it out myself, so that I, too can observe results!

  3. Ross Schwartz 14091136

    The topic of this article caught my attention immediately as I am passionate about my gym and always looking out for new tips to take my training to another level.

    I totally agree with the article and find it very informative. I have used a standard whey protein for a long time and only recently started using a casein and soy blend protein and have started to see results. whey protein shake with breakfast is a great way to get your day started as it is fast-digesting and acts rapidly to stop any muscle catabolism that might have occurred in the last few hours of sleep due to the lack of circulating amino acids. while on the other hand a casein protein has a slow digestion rate and should ideally be taken before bed. The soy protein fits in between the whey and casein proteins in terms of digestion rates.

    Therefore a casein-whey-soy blend of protein theoretically could help your body sustain a higher level of protein synthesis and help repair damaged tissue at a more efficient rate and prevent catabolism. Due to soy protein being more cost effective than the other two protein’s mentioned above, a greater amount can be consumed, making it the idea source of protein for people with budget restrictions.

  4. I like what this article is all about!as I am also on the gym industry,i have experience in using this other supplement called “100%soy protein” ..Initially I didn’t know how does soy actually help in muscle building,however thanks to you(the author) now that you have given me more reasons to continue using soy protein shake instead of protein whey only.I am just worried that I don’t know any place where I can get soy protein shakes in South Africa because I only buy them from USA bodybuilding online shop because some times it takes time to ship and I just can’t afford buy a bulk if soy food.

  5. This is a very interesting article that instantly caught my attention, as I am actively involved in the gyming environment and know alot of people who share this active involvement and interest.

    This is something completely new to me. Although, it is proven that a blend of soy and whey protein can prolong muscle building activity, I am hesitant to try it out. After reading this article, I read up on the subject. The main focus of this is the muscle building that the soy helps prolong, however, I do think that the disadvantages that this soy mix can have on hormone balances within the body should be highlighted as well.
    According to the reading up I have done, it is said that soy contains biologically active compounds known as inflavones that can have a negative impact on estrogen and testosterone levels within both males and females. Will this have an impact when taking the soy dairy protein blend?


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