| The relationship between PA and mental health and well being |
| Paper ID : 1180-SSRC-13TH |
| Authors |
|
Louay Mahmoud Labban * Al Jazeera Private University |
| Abstract |
| Background: Athletes usually require consuming balanced diets which composed of 50% carbohydrates, 20 % Protein and 30% fat. Many athletes believe that low carbohydrates and high fat diets can improve their performance and they can support their competitive activities. The relationship between a low-carbohydrate diets and anaerobic sport activities has not been studied extensively. The aim of this study was to examine the effects of a low-carbohydrate diet (L- CHO) on anaerobic exercise, hormonal profile and metabolic responses. Materials &Methods: Twelve athletes participated in this study who underwent Wingate test on two occasions: after the normal diet (ND 50% carbohydrate, 20% protein 30% fat), following 4 weeks of the L-CHD (10% carbohydrate, 25% protein, 65% fat). Venous blood samples before and during 1 h after the work out, to measure concentrations of insulin, testosterone, GH, cortisol, blood lactate, β hydroxybutyrate, and glucose after each dietary intervention. Results: L- CHO diet significantly increased testosterone and growth hormone (GH) concentrations (0.14 vs 0.25 ng/mL ) and (495.3 vs 661 nmol/L ) respectively while the level of insulin and cortisol decreased respectively ( 5.21 vs 3.78 IU/mL)( 17.01 vs 16.31 µg/dL. L-CHO diet also decreased blood lactate level in rest and after exercise (8.95 vs 7.03 mmol/L) but increased β hydroxybutyrate level (0.05 vs 0.173 mmol/L). Glucose level decreased after consuming L- CHO compared with normal diet ND (97.1 vs 81.1 mg/dL). The study has shown that dietary depletion of CHO can shift hormonal and cellular to increased utilization of non-esterified fatty acids and to a much lesser extent amino acids. Increased Testeosterone, GH and Insulin have metabolic and anabolic effect. Conclusions: Reduced CHO intake for 3 days boosts activity of the sympathoadrenal system at rest and after exercise. The principle of vasodilating muscle arterioles by altering eicosanoid production. Eicosanoid reportedly produced in the L- CHO diet maybe responsible for improved muscle oxygenation which may benefit even the most athletes. L-CHO diet could be harmful to anaerobic work capacity, possibly because of a reduced muscle glycogen store and decreased rate of glycolysis. |
| Keywords |
| Low Carbohydrates diet; Athletes; β hydroxybuterate; Insulin; Glucose Testosterone; Cortisol |
| Status: Abstract Accepted (Oral Presentation) |
