Featured Research

from universities, journals, and other organizations

Popular muscle-boosting supplement does not increase blood flow, study suggests

Date:
August 11, 2011
Source:
Baylor University
Summary:
A new 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.

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.

In recent years, various nutritional supplements have been developed containing arginine-alpha-ketoglutarate (AAKG), which is alleged to increase nitric oxide production thereby resulting in "vasodilation," the widening of blood vessels and increased blood flow to the muscles. The AAKG supplement-enhanced blood flow to working muscles during resistance exercise is alleged to provide increased muscle strength than just exercise alone.

The Baylor researchers studied the effects in 24 men of seven days of AAKG supplementation using the nutritional supplement on arterial blood flow in the arms after a single bout of resistance exercise. The results showed that seven days of AAKG supplementation had no significant impact on blood movement or increased brachial artery blood flow in response to a single bout of resistance exercise.

"We did see a slight increase in blood flow but those effects can only be attributed to the resistance exercise and not to the supplement," said study author Dr. Darryn Willoughby, associate professor of exercise, nutritional biochemistry and molecular physiology at Baylor. "The data appear to refute the alleged supposition and manufacturer's claims that 'vasodilating supplements' are effective at causing vasodilation, thereby resulting in increased blood flow to active skeletal muscle during resistance exercise. Furthermore, we specifically demonstrated that a single bout of resistance exercise increases vasodilation, arterial blood flow and circulating nitric oxide levels, but that the AAKG supplement provided no additive, preferential response compared to a placebo."


Story Source:

The above story is based on materials provided by Baylor University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Willoughby DS, Boucher T, Reid J, Skelton G, Clark M. Effects of seven days of arginine-alpha-ketoglutarate supplementation on blood flow, plasma L-arginine, nitric oxide metabolites, and asymmetric dimethyl arginine after resistance exercise. International Journal of Sport Nutrition and Exercise Metabolism, 21:291-99, 2011

Cite This Page:

Baylor University. "Popular muscle-boosting supplement does not increase blood flow, study suggests." ScienceDaily. ScienceDaily, 11 August 2011. <www.sciencedaily.com/releases/2011/08/110810133006.htm>.
Baylor University. (2011, August 11). Popular muscle-boosting supplement does not increase blood flow, study suggests. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2011/08/110810133006.htm
Baylor University. "Popular muscle-boosting supplement does not increase blood flow, study suggests." ScienceDaily. www.sciencedaily.com/releases/2011/08/110810133006.htm (accessed October 22, 2014).

Share This



More Health & Medicine News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Orthodontist Mom Jennifer Salzer on the Best Time for Braces

Orthodontist Mom Jennifer Salzer on the Best Time for Braces

Working Mother (Oct. 22, 2014) Is your child ready? Video provided by Working Mother
Powered by NewsLook.com
U.S. Issues Ebola Travel Restrictions, Are Visa Bans Next?

U.S. Issues Ebola Travel Restrictions, Are Visa Bans Next?

Newsy (Oct. 22, 2014) Now that the U.S. is restricting travel from West Africa, some are dropping questions about a travel ban and instead asking about visa bans. Video provided by Newsy
Powered by NewsLook.com
US to Track Everyone Coming from Ebola Nations

US to Track Everyone Coming from Ebola Nations

AP (Oct. 22, 2014) Stepping up their vigilance against Ebola, federal authorities said Wednesday that everyone traveling into the US from Ebola-stricken nations will be monitored for symptoms for 21 days. (Oct. 22) Video provided by AP
Powered by NewsLook.com
Doctors Help Paralysed Man Walk Again, Patient in Disbelief

Doctors Help Paralysed Man Walk Again, Patient in Disbelief

AFP (Oct. 22, 2014) Polish doctors describe how they helped a paralysed man walk again, with the patient in disbelief at the return of sensation to his legs. Duration: 1:04 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins