Dietary Supplements and Sports Performance: Amino Acids

Williams, Melvin H.

doi:10.1186/1550-2783-2-2-63

Cited by 85 publications

(54 citation statements)

References 39 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, the proteins play a supporting role in the energy supply for the activity to endurance athletes, where daily need is calculated as 1.2 to 1.6g/ kg of weight/day (22,26,27) . Traditionally, it is strongly believed in the sports environment that high protein or amino acids intake would increase strength and muscle mass (23,28,29) . It cannot be denied that consumption of these nutrients is crucial to synthesis of body structures and is involved in countless metabolic mechanisms associated with exercise.…”

Section: Discussionmentioning

confidence: 99%

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil

Goston

Mendes

2011

Rev Bras Med Esporte

View full text Add to dashboard Cite

The anthropometric and/or dietary profile of elite runners has been studied; however, little is known about the characteristics of recreational street runners. This study was aimed to characterize the nutritional profile of recreational runners from a sports club in Belo Horizonte, MG, Brazil, who were referred to a nutritional clinic of a local private college. The sample study was composed of 19 athletes, aged between 28 and 53 years. The diagnosis of the runners' nutritional status was obtained by assessment of their energy and macronutrients -carbohydrates (CHO), lipids (LIP), and proteins (PTN) consumption-through the 24-hour dietary recall (R24h), as well as analysis of their anthropometric profile. The results obtained from the dietary evaluation showed that according to the recommendations proposed by the DRIs (Dietary Reference Intakes), the distribution of energy among the macronutrients in both men and women was adequate: 48.1±9.2% (CHO), 29.6±7.2% (LIP) and 22.3±4.96% (PTN). However, when considering energy consumption in g/kg of body weight, the intake of CHO was low (3.54±1.45g/kg/d) and of PTN was high (1.7±0.57 g/kg/d) for this type of recreational exercise. Regarding total energy consumption, 89.5% of runners presented energy intake below the recommended values, resulting in daily caloric deficiency. Concerning the anthropometric evaluation, the average percentage of body fat (%G) for men and women was not statistically different and was considered adequate based on their age. Waist circumference (WC) and waist/hip ratio (WHR) of the studied group showed normal results and do not represent increased risk for cardiovascular diseases. In conclusion, the study indicates that although the athletes showed adequate caloric distribution of macronutrients, it was still not sufficient to meet the energy requirements of their modality, suggesting hence that continuous nutritional guidance is needed.

show abstract

Section: Discussionmentioning

confidence: 99%

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil

Goston

Mendes

2011

Rev Bras Med Esporte

View full text Add to dashboard Cite

show abstract

“…Several studies involving patients with peripheral arterial disease or clinical symptoms of stable angina pectoris showed improved exercise capacity following Larginine supplementation [3,8,30]. However, reports on independent effects of L-arginine supplementation on the aerobic capacity of healthy athletes are scarce.…”

Section: Discussionmentioning

confidence: 99%

Effects of oral L-arginine supplementation on vasodilation and O₂max in male soccer players

Yaman

Sönmez

Gürel

2010

Biomedical Human Kinetics

View full text Add to dashboard Cite

Turkey SummaryStudy aim: To determine the effects of oral L-arginine supplementation on vasodilation, blood flow and maximum oxygen uptake ( ‡O 2 max) in soccer players. Material and methods: A group of 24 healthy male soccer players aged 20 -26 years volunteered to participate in the study. The subjects were randomly assigned into 3 groups: experimental, placebo and control. Experimental group was given L-arginine (6 g orally) and the placebo group -starch (6 g orally) daily for a week; subjects from the control group remained untreated. Before the test and at the end of the week blood samples were collected, and systemic blood pressures, blood flows and maximal oxygen uptake ( ‡O 2 max, by Queens College step test) were recorded. Blood samples were assayed for HDL, LDL, triglyceride and urea concentrations. The study was conducted in a randomised, single-blinded, placebo-controlled fashion consisting of 7-day treatment periods. Results: Oral supplementation of L-arginine significantly (p<0.01) decreased blood pressure indices and increased ‡O 2 max (p<0.01), blood flow (p<0.05), femoral artery diameter (p<0.05) and urea levels (p<0.05). There was no change in blood lipid levels (p<0.05). No significant changes were noted in the placebo and control groups. Conclusions: Oral supplementation of L-arginine may have beneficial effect on vasodilation and ‡O 2 max, therefore may increase the exercise capacity of soccer players.

show abstract

“…Resistance training has become a frequently chosen method for increasing strength, flexibility, muscle mass, power and speed, local muscular endurance, balance and for improving athletic performance (American College of Sports Medicine, 2001). Also amino acids are theorized to enhance performance in a variety of ways, such as increasing the secretion of anabolic hormones, modifying fuel use during exercise, preventing adverse effects of overtraining, and preventing mental fatigue (Melvin, 2005). Glutamine is the most abundant non-essential amino acid in human muscle and plasma (Phillips, 2007).…”

Section: Introductionmentioning

confidence: 99%

The effects of glutamine supplementation on performance and hormonal responses in non-athlete male students during eight week resistance training

Hakimi¹,

Mohamadi²,

Ghaderi³

2012

JHSE

View full text Add to dashboard Cite

Hakimi M, Mohamadi MA, Ghaderi Z. The effects of glutamine supplementation on performance and hormonal responses in non-athlete male students during eight week resistance training. J. Hum. Sport Exerc. Vol. 7, No. 4, pp.770-782, 2012. The aim of this study was to determine the effects of glutamine supplementation on performance, and hormonal changes during an 8-week resistance training program in non athlete male students. Thirty healthy non athlete male (age 21.25 ± 1.6 years, height 173.2 ± 3.2 cm, body mass 72.8 ± 2.8 kg, VO 2max 43.48± 2.38 ml·kg -1 ·min -1 ) were randomly divided into a glutamine supplementation (GL) group (n=15), and a placebo (PL) group (n=15). Each group was given either glutamine or a placebo in a double blind manner to be taken orally for eight weeks (0.35 g/kg/day). GL and PL groups performed the same weight training program 3 days, each week for 8 weeks. The training consisted of 3 sets of 8 repetitions, and the initial weight was 80% of the pre-1RM. Subjects were tested for performance and blood hormone concentrations before and after the 8-week period. Both groups increased their performance however the GL group showed significantly greater increases in upper and lower body strength, explosive muscular power, blood testosterone, GH and IGF-1 when compared to the PL group; however, cortisol concentrations were significantly more reduced in GL group when compared to the PL group. It can, therefore, be concluded that within 8 weeks glutamine supplementation during resistance training was found to increase performance (explosive muscular power, muscle strength) and improved body composition (increased body mass, fat-free mass and reduced body fat).

show abstract

Dietary Supplements and Sports Performance: Amino Acids

Cited by 85 publications

References 39 publications

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil

Effects of oral L-arginine supplementation on vasodilation and O₂max in male soccer players

The effects of glutamine supplementation on performance and hormonal responses in non-athlete male students during eight week resistance training

Contact Info

Product

Resources

About

Dietary Supplements and Sports Performance: Amino Acids

Cited by 85 publications

References 39 publications

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil

Perfil nutricional de praticantes de corrida de rua de um clube esportivo da cidade de Belo Horizonte, MG, Brasil

Effects of oral L-arginine supplementation on vasodilation and O2max in male soccer players

The effects of glutamine supplementation on performance and hormonal responses in non-athlete male students during eight week resistance training

Contact Info

Product

Resources

About

Effects of oral L-arginine supplementation on vasodilation and O₂max in male soccer players