Effects of Ingesting a Food Bar Containing Whey Protein and Isomalto‐Oligosaccharides on Performance and Recovery from an Acute Bout of Resistance‐Exercise and Sprint‐Conditioning
Authors: Grubic Tyler , Sowinski Ryan , Nevares Ben , Jenkins Victoria , Williamson Susannah , Reyes Aimee , Rasmussen Christopher , Greenwood Mike , Murano Peter , Earnest Conrad , Kreider Richard 
Published: June 2021

We previously reported that consuming a food bar (FB)containing whey protein and the plant fiber isomalto‐oligosaccharides [IMO] hada lower glycemic but similar insulinemic response as a high glycemic indexcarbohydrate. Therefore, we hypothesized that ingestion of this FB prior to, during, and following intense exercise would better maintain glucosehomeostasis and exercise capacity during exercise as well as hasten recovery incomparison to a carbohydrate matched placebo (PLA). Twelve resistance‐trainedmales participated in an open label, randomized, counterbalanced, cross‐overtrial with a 7‐d washout period. Participants consumed a carbohydrate matcheddextrose PLA or a FB containing 20 g of whey, 25 g of IMO, and 7 g of fat 30‐min prior to, mid‐way, and following intense exercise. Participantsperformed 11 resistance‐exercises (3 sets of 10 repetitions at 70% of onerepetition maximum) followed by performing agility and sprint conditioningdrills for time. Participants donated blood samples, performed isokineticstrength tests, and rated perceptions of muscle soreness and hypoglycemia priorto and following exercise and after 48 hours of recovery. Data were analyzed bygeneral linear model repeated measures and are reported as mean change frombaseline with 95% confidence intervals. Results revealed that blood glucose wassignificantly higher 30‐min post‐ingestion with PLA (PLA 3.1 [2.0, 4.3], FB 0.8[0.2, 1.5] mmol/L, p=0.001) while post‐exercise ratio of insulin to glucose wasgreater with FB (PLA 0.04 [0.00, 0.08], FB 0.11 [0.07, 0.15], p=0.013, η2=0.25). Total lifting volume was maintained toa greater degree from Set 1 to Set 3 with FB than PLA (PLA −198.26 [−320.1, −76.4], FB −81.7 [−203.6, 40.1] kg, p=0.175, η2=0.08). Ratings of muscle soreness of thedistal vastus medialis to a standard amount of pressure were lower with FB (PLA1.88 [0.60, 3.17]; FB 0.29 [−0.99, 1.57] cm, p=0.083, η2=0.13). However, no significant differences were observed between treatments in sprintperformance, isokinetic strength, markers of catabolism, stress and sexhormones, or inflammatory markers. Results indicate that ingestion ofthis FB can positively affect glucose homeostasis, sustain exerciseperformance, and lessen perceptions of muscle soreness after intense training.

Support or Funding Information

This study was supported internally by Dr. Richard B. Kreider and the Exercise and Sport Nutrition Laboratory at Texas A&M University as part of a student dissertation. Dr. Conrad Earnest served as a Director of Clinical Sciences for Nutrabolt. Dr. Kreider served as a university approved scientific advisor for Nutrabolt. Dr. Peter Murano serves as Texas A&M University approved quality assurance supervisor.

This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.