Comparison between Preexercise Meals Intake Effect with Different Glycemic Load on Exercise Performance in Female Athletes

Abstract

Athletes usually search for strategies to optimize their performance. Manipulation of carbohydrate (CHO) resources glycemic load in order to optimizing athletic performance provides new research areas in nutritional sport. Purpose of this study is to examine the effects of two isocaloric meals with different glycemic load (GL) on exercise performance and serum free fatty acids. Thirty six non-professional athletic women with ages between 19 and 24 were assigned in a double blinded randomized clinical trial with two period cross-over design. Participants in each group received a high or low GL meal as a breakfast, and 7-day wash out period is determined. serum free fatty acid (FFA) measurements were performed before and after each phase of intervention.3 hour After ingestion of a meal, participants run to exhaustion, in a 20 meters shuttle run pacer. Time to exhaustion (TTE) was recorded as a measure of exercise performance. In an attempt to ensure that subjects run to exhaustion, rating of perceived exertion (RPE) was measured, using a Borg scale, too. The ingestion of a low GL or high GL pre-exercise meal did not lead to different TEE and RPE at 3 hours before exercise in female athletic students. Mean changes of serum FFA were higher in low GL than high GL meal. Consumption of a low GL meal compared with a high GL meal at 3-hr before a shuttle run pacer, was not associated with significant changes in TEE and RPE levels but low GL meal led to more increase serum FFA than high GL.

Pengaruh diet dengan pengaturan indeks glikemik dan beban glikemik terhadap kadar glukosa darah atlet sepak bola remaja

“…Hal tersebut ditunjukkan dengan rendahnya oksidasi karbohidrat, tingginya gliserol dan konsentrasi asam lemak bebas.Penelitian menunjukkan bahwa konsumsi diet BG rendah atau tinggi sebelum latihan tidak memiliki efek terhadap perubahan time to exhaustion (TEE) dan rating perceived exertion (RPE), akan tetapi diet dengan BG rendah memicu terjadinya peningkatan serum asam lemak bebas dibanding dengan diet BG tinggi. 14 Sampai saat ini penelitian tentang pengaturan (pemberian) makanan pada atlet sebelum latihan belum banyak mempertimbangkan mengenai beban glikemik, terutama di Indonesia. Beberapa hasil penelitian sebelumnya hanya mempertimbangkan faktor indeks glikemi saja.…”

The Effect of Low and High Glycemic Load Diet on Muscle Fatigue of Young Soccer Athletes

“…The inclusion subject criteria: (1) men aged 15-18 years, (2) joined in soccer clubs for at least 1 year, (3) a minimum of 90% physical exercise attended in the last 12 weeks, (4) not being sick, injured, or in the care of a doctor, (5) not taking carbohydrate-based supplements or sports drinks in 24 hours before the study, A low glycemic index (GI) carbohydrate consumption mentioned more appropriate given before the endurance exercise plan than high GI foods. Low GI foods can increase blood glucose more slowly so that blood glucose becomes more stable than high GI foods (Ghiasvand et al 2015;Cocate et al 2011). It cause a blood glucose homeostasis, decreased carbohydrate oxidation and increased fat oxidation which can reduce lactic acid levels (Chen et al 2008).…”

“…Muscle fatigue occurs when the supply of ATP (Adenosine Triphosphate) fails to meet ATP consumption during exercise. This occurs because the supply of oxygen to the cells is inadequate so that the ATP production process shifts from the aerobic and during exercise (Ghiasvand et al 2015;Chen et al 2008). The increase in blood glucose in the low-GI low-GL (L-L) diet group occurred slowly compared to the low GI high GL (L-H) and high-GI high GL (H-H) group (Siwi et al 2017).…”