Impact of a Multi-Component Dietary Supplement on Blood Testosterone, Nitrate/Nitrite and Physical Performance in Resistance-Trained Men
Journal Title: Journal of Advances in Medicine and Medical Research - Year 2016, Vol 11, Issue 1
Abstract
Both D-aspartic acid (DAA) and nitrate have received considerable attention in recent years. Vitamin D3 is also considered important for overall physical health and has been associated with elevated blood testosterone. The present study evaluated the impact of a DAA-nitrate-vitamin D3 containing dietary supplement on anaerobic exercise performance, blood testosterone and nitrate/nitrite in men. Methods: 24 resistance-trained men (mean age: 23 years) were assigned to ingest a DAA-nitrate-vitamin D3 supplement or a placebo for 28 days. Exercise performance (upper body muscle power, force, and endurance; Wingate cycle sprints), in addition to blood total and free testosterone and nitrate/nitrite was measured before and after 14 and 28 days of supplementation. Results: No increase in total or free testosterone was noted at either measurement time (p>0.05), with values remaining stable or decreasing slightly following intake of the supplement. Nitrate/nitrite was increased significantly following intake of the supplement (p<0.05), from 19.1±2.1 µmol∙L-1 (pre) to 70.0±12.4 µmol∙L-1 at 14 days and 68.6±7.7 µmol∙L-1 at 28 days. Despite this increase in nitrate/nitrite, no performance variable was impacted in a statistically significant manner by supplementation (p>0.05). However, the cumulative number of repetitions performed during a five-set bench press challenge was 11.3% higher after 28 days of supplementation, as compared to 3.6% higher for placebo. Conclusion: Twenty-eight days of treatment with a DAA-nitrate-vitamin D3 supplement increases blood nitrate/nitrite and can moderately improve repetitive bench press performance. However, this supplement does not result in an increase in total or free testosterone or any other performance measure.
Authors and Affiliations
Logan J. Rodgers, John Henry M. Schriefer, Trint A. Gunnels, Richard J. Bloomer
Keywords
Related Articles
- EP ID EP339920
- DOI 10.9734/BJMMR/2016/19427
- Views 65
- Downloads 0
Polymorphisms in Interleukin-2 and Interleukin-7 Receptor α-Chain Genes and Human Herpes Virus-6 as Risk Factors for Multiple Sclerosis
Aim: The aim of this study was to examine whether a Human herpes virus-6 (HHV-6) infection increases the risk of MS in individuals harboring particular cytokine receptor α-chain gene alleles. Study Design: MS patients an...
General Osteopathic Treatment is Associated with Postural Changes
Aim: To investigate whether standard general osteopathic treatment can influence the static configuration of the vertebral column or pelvis. Material and Methods: One hundred thirteen persons, 72 females and 41 males, ei...
Patterns of Waterpipe Use among Arab Immigrants in the USA: A Pilot Study
Aim: Waterpipe smoking is becoming increasingly popular in the U.S., especially among minority groups. The purpose of this preliminary study was to explore the patterns of waterpipe use, as well as the association betwee...
A Salpingo-Cutaneous Fistula in a Patient after Peripartum Hysterectomy
Aims: Salpingo-cutaneous fistula is an extremely rare clinical condition that can be seen after pelvic or uterine surgery. Presentation of Case: A case of an salpingo-cutaneous fistula that developed in a nulliparous w...
Cytological Findings in Urine of Adult Residents of Urinary Schistosomiasis Endemic Community in Cross River State, Nigeria
Aims: To investigate urinary cytological abnormalities among adult residents of a urinary schistosomiasis endemic community. Study Design: Ethical approval, consent from the village Head/villagers, parasitological surve...