A group of researchers recently expanded upon the limited prior research examining the effects of soy and whey protein supplementation on testosterone, sex hormone binding globulin (SHBG), and cortisol responses to an acute bout of resistance exercise. Their study, "The Effects of Soy and Whey Protein Supplementation on Acute Hormonal Reponses to Resistance Exercise in Men" is now available in the Journal of the American College of Nutrition.
With protein supplement use by athletes on the rise, a group of researchers recently expanded upon the limited prior research examining the effects of soy and whey protein supplementation on testosterone, sex hormone binding globulin (SHBG), and cortisol responses to an acute bout of resistance exercise.
"This study starts to unravel and provide some insights into one of the real urban myths about soy protein and resistance exercise in men," said Dr. William J. Kraemer, the lead researcher of the study.
Using a sample of 10 resistance-trained men in their early 20s, protein supplementation consisted of 3 treatment groups: whey protein isolate, soy protein isolate, or a maltrodextrin placebo control. No other supplements were allowed. Vegetarians, vegans, or subjects who consumed high-protein diets were excluded from the study. For 14 days, participants would ingest 20g of their assigned supplement at the same time each morning. The participants would then perform 6 sets of heavy resistance squats at 10 reps each using 80 percent of their maximum lifting weight.
"Our main findings demonstrate that 14 days of supplementation with soy protein does appear to partially blunt serum testosterone. In addition, whey influences the response of cortisol following an acute bout of resistance exercise by blunting its increase during recovery. Protein supplementation alters the physiological responses to a commonly used exercise modality with some differences due to the type of protein utilized," wrote the researchers.
Explore further: What works for women doesn't work for men
More information: Kraemer, W. et al. The Effects of Soy and Whey Protein Supplementation on Acute Hormonal Reponses to Resistance Exercise in Men, Journal of the American College of Nutrition. www.tandfonline.com/doi/abs/10.1080/07315724.2013.770648
Medical Xpress on facebook
Related Stories
What works for women doesn't work for men
Sep 30, 2013
Flushed face, sweating, a sudden rush of heat. The hot flash, the bane of menopausal women, also can affect men who are undergoing hormone therapy for prostate cancer.
Soy protein supplementation does not reduce risk of prostate cancer recurrence
Jul 09, 2013
Among men who had undergone radical prostatectomy, daily consumption of a beverage powder supplement containing soy protein isolate for 2 years did not reduce or delay development of biochemical recurrence of prostate cancer ...
Study finds popular muscle-boosting supplement does not increase blood flow
Aug 10, 2011
A Baylor University study has found that a popular nutritional supplement that is marketed to lead to greater muscle strength through increasing blood flow to the muscle does not increase blood flow as claimed on the bottle.
Non-celiac gluten sensitivity's existence questioned
Aug 23, 2013
(HealthDay)—There is no evidence that gluten is a trigger in patients with non-celiac gluten sensitivity (NCGS) placed on a low fermentable, oligo-, di-, monosaccharides, and polyols (FODMAP) diet, according ...
Soy isoflavone supplements did not provide breast cancer protections
Feb 03, 2012
Soy isoflavone supplements did not decrease breast cancer cell proliferation in a randomized clinical trial, according to a study published in Cancer Prevention Research, a journal of the American Association for Cancer Resear ...
Recommended for you
Improving control of child malnutrition in developing countries
2 minutes ago
NutrInfo is a research result conducted by the group of Telematic Systems for the Information and Knowledge Society of the Universidad Politécnica de Madrid (UPM). It consists of application software that captures weight ...
Adolescents born premature report being just as happy and healthy as their peers
30 minutes ago
Adolescents who were born extremely premature or extremely low birth weight report no differences in quality of life or self-esteem at age 18 compared with their term born peers, a study by Murdoch Childrens Research Institute ...
Med schools improve conflict-of-interest standards, yet much room for progress remains
3 hours ago
U.S. medical schools have made significant progress to strengthen their management of clinical conflicts of interest (CCOI), but a new study demonstrates that most schools still lag behind national standards. ...
Study finds herbal products omit ingredients, contain fillers
7 hours ago
Consumers of natural health products beware. The majority of herbal products on the market contain ingredients not listed on the label, with most companies substituting cheaper alternatives and using fillers, according to ...
Healthier diets possible in low-income, rural communities in America
7 hours ago
In the United States, children don't eat enough fruits, vegetables and whole grains. Instead, their diets typically include excessive amounts of sugars and solid fats, counter to the 2010 Dietary Guidelines for Americans ...
Study finds no increased risk of suicide in patients using smoking cessation drugs
12 hours ago
A study to assess whether patients prescribed smoking cessation drugs are at an increased risk of suicide, self-harm and treated depression compared with users of nicotine replacement therapy (NRT) has found no evidence of ...
User comments
© Medical Xpress 2011-2013, Phys.org network
A group of researchers recently expanded upon the limited prior research examining the effects of soy and whey protein supplementation on testosterone, sex hormone binding globulin (SHBG), and cortisol responses to an acute bout of resistance exercise. Their study, "The Effects of Soy and Whey Protein Supplementation on Acute Hormonal Reponses to Resistance Exercise in Men" is now available in the Journal of the American College of Nutrition.
With protein supplement use by athletes on the rise, a group of researchers recently expanded upon the limited prior research examining the effects of soy and whey protein supplementation on testosterone, sex hormone binding globulin (SHBG), and cortisol responses to an acute bout of resistance exercise.
"This study starts to unravel and provide some insights into one of the real urban myths about soy protein and resistance exercise in men," said Dr. William J. Kraemer, the lead researcher of the study.
Using a sample of 10 resistance-trained men in their early 20s, protein supplementation consisted of 3 treatment groups: whey protein isolate, soy protein isolate, or a maltrodextrin placebo control. No other supplements were allowed. Vegetarians, vegans, or subjects who consumed high-protein diets were excluded from the study. For 14 days, participants would ingest 20g of their assigned supplement at the same time each morning. The participants would then perform 6 sets of heavy resistance squats at 10 reps each using 80 percent of their maximum lifting weight.
"Our main findings demonstrate that 14 days of supplementation with soy protein does appear to partially blunt serum testosterone. In addition, whey influences the response of cortisol following an acute bout of resistance exercise by blunting its increase during recovery. Protein supplementation alters the physiological responses to a commonly used exercise modality with some differences due to the type of protein utilized," wrote the researchers.
Explore further: What works for women doesn't work for men
More information: Kraemer, W. et al. The Effects of Soy and Whey Protein Supplementation on Acute Hormonal Reponses to Resistance Exercise in Men, Journal of the American College of Nutrition. www.tandfonline.com/doi/abs/10.1080/07315724.2013.770648
Medical Xpress on facebook
Related Stories
What works for women doesn't work for men
Sep 30, 2013
Flushed face, sweating, a sudden rush of heat. The hot flash, the bane of menopausal women, also can affect men who are undergoing hormone therapy for prostate cancer.
Soy protein supplementation does not reduce risk of prostate cancer recurrence
Jul 09, 2013
Among men who had undergone radical prostatectomy, daily consumption of a beverage powder supplement containing soy protein isolate for 2 years did not reduce or delay development of biochemical recurrence of prostate cancer ...
Study finds popular muscle-boosting supplement does not increase blood flow
Aug 10, 2011
A Baylor University study has found that a popular nutritional supplement that is marketed to lead to greater muscle strength through increasing blood flow to the muscle does not increase blood flow as claimed on the bottle.
Non-celiac gluten sensitivity's existence questioned
Aug 23, 2013
(HealthDay)—There is no evidence that gluten is a trigger in patients with non-celiac gluten sensitivity (NCGS) placed on a low fermentable, oligo-, di-, monosaccharides, and polyols (FODMAP) diet, according ...
Soy isoflavone supplements did not provide breast cancer protections
Feb 03, 2012
Soy isoflavone supplements did not decrease breast cancer cell proliferation in a randomized clinical trial, according to a study published in Cancer Prevention Research, a journal of the American Association for Cancer Resear ...
Recommended for you
Improving control of child malnutrition in developing countries
2 minutes ago
NutrInfo is a research result conducted by the group of Telematic Systems for the Information and Knowledge Society of the Universidad Politécnica de Madrid (UPM). It consists of application software that captures weight ...
Adolescents born premature report being just as happy and healthy as their peers
30 minutes ago
Adolescents who were born extremely premature or extremely low birth weight report no differences in quality of life or self-esteem at age 18 compared with their term born peers, a study by Murdoch Childrens Research Institute ...
Med schools improve conflict-of-interest standards, yet much room for progress remains
3 hours ago
U.S. medical schools have made significant progress to strengthen their management of clinical conflicts of interest (CCOI), but a new study demonstrates that most schools still lag behind national standards. ...
Study finds herbal products omit ingredients, contain fillers
7 hours ago
Consumers of natural health products beware. The majority of herbal products on the market contain ingredients not listed on the label, with most companies substituting cheaper alternatives and using fillers, according to ...
Healthier diets possible in low-income, rural communities in America
7 hours ago
In the United States, children don't eat enough fruits, vegetables and whole grains. Instead, their diets typically include excessive amounts of sugars and solid fats, counter to the 2010 Dietary Guidelines for Americans ...
Study finds no increased risk of suicide in patients using smoking cessation drugs
12 hours ago
A study to assess whether patients prescribed smoking cessation drugs are at an increased risk of suicide, self-harm and treated depression compared with users of nicotine replacement therapy (NRT) has found no evidence of ...
User comments
© Medical Xpress 2011-2013, Phys.org network
0 comments:
Post a Comment