Combination of Sago and Soy-Protein Supplementation During Endurance Cycling Exercise and Subsequent High-Intensity Endurance Capacity

Abstract

The purpose of the study was to investigate whether a combination of sago and soy protein ingested during moderate-intensity cycling exercise can improve subsequent high-intensity endurance capacity compared with a carbohydrate in the form of sago and with a placebo. The participants were 8 male recreational cyclists with age, weight, and VO2max of 21.5 +/- 1.1 yr, 63.3 +/- 2.4 kg, and 39.9 +/- 1.1 ml . kg(-1) . min(-1), respectively. The design of the study was a randomized, double-blind placebo-controlled crossover comprising 60 min of exercise on a cycle ergometer at 60% VO2max followed by a time-to-exhaustion ride at 90% VO2max. The sago feeding provided 60 g of carbohydrate, and the sago-soy combination provided 52.5 g of carbohydrate and 15 g of protein, both at 20-min intervals during exercise. Times to exhaustion for the placebo, sago, and sago-soy supplementations were 4.09 +/- 1.28, 5.49 +/- 1.20, and 7.53 +/- 2.02 min, respectively. Sago-soy supplementation increased endurance by 84% (44-140%; p < .001) and by 37% (15-63%; p < .05) relative to placebo and sago, respectively. The plasma insulin response was elevated above that with placebo during sago and sago-soy supplementations. The authors conclude that a combination of sago and soy protein can delay fatigue during high-intensity cycling.

Cycling Time Trial Performance May Be Impaired by Whey Protein and L-Alanine Intake During Prolonged Exercise

“…Though possible noncaloric mechanisms are largely unknown, recent work points to the possibility that PRO (with CHO) can favorably impact HR and/or RPE during exercise (Hall et al, 2013;Martinez-Lagunas et al, 2010;McCleave et al, 2011). The impact that PRO can have on HR may precipitate from altered intestinal absorption rates of sodium and water.…”

“…Interestingly, HR was possibly lower with ALA compared with PLA at both 20-and 120-min of the constant-load phase. Perhaps this precipitated from the intestinal cotransport mechanism described above; ALA may have facilitated sodium and water absorption across the gut (Rowlands et al, 2012;Van Loon et al, 1996;Wapnir et al, 1988) thereby preserving plasma volume (Hall et al, 2013) and reducing HR. The importance of this response is questionable though considering that this did not elicit a lower RPE than PLA nor did the lower HR persist into the TT.…”

“…Neutral amino acids are cotransported with sodium across the intestines via glucose independent transporters (Coëffier et al, 2005). Additional sodium absorption across the gut may increase transport of water via solvent drag (Rowlands et al, 2012;Van Loon et al, 1996;Wapnir et al, 1988), which could tenably preserve plasma volume (Hall et al, 2013) and as a result minimize cardiovascular drift (HR) and perceptual strain (Casa et al, 2010). Our data (RPE and HR) suggest that PRO alone does not systematically alter these parameters.…”

Sago supplementation for exercise performed in a thermally stressful environment: Rationale, efficacy and opportunity

“…Southeast Asia is a region with over 600,000,000 inhabitants and a year-round tropical (warm-humid) climate, where sago ( Metroxylin sagu ) palms are widely distributed and their starch is used as an important dietary CHO source; 14 for example, Malaysia, Indonesia and Papua New Guinea are the world's leading countries in the production of sago 15 . Previous research has identified sago as being rapidly digestible, quickly absorbed and therefore suitable for consumption before, during and in recovery from exercise, 16 however only one study had initially tested this notion 17 before our recent series of investigations developing a reliable protocol to test whether supplementing sago before, during and in recovery indeed proved ergogenic 18-20 …”

Effects of Respiratory Muscle Warm-up on High-Intensity Exercise Performance

“…Volume of oxygen exhaled (VO2), volume of carbon dioxide exhaled (VCO2), RER, minute ventilation (VE), and HR were recorded using 15 s averages during the TTE. The TTE was terminated when the exerciser failed to maintain ≥60 revolutions per minute for five consecutive seconds [23,24]. Blood lactate was taken immediately after TTE was terminated.…”