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Consuming a lentil‐based sports nutrition bar affects metabolic and performance measures during endurance exercise
Author(s) -
Zello Gordon Alexander,
Jochim Jennifer T.,
Rooke Julianne,
Chilibeck Philip D.
Publication year - 2012
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.26.1_supplement.820.19
Subject(s) - cycling , placebo , respiratory exchange ratio , time trial , zoology , bar (unit) , sports nutrition , medicine , endurance training , exercise physiology , food science , chemistry , physical therapy , athletes , biology , heart rate , physics , alternative medicine , archaeology , pathology , meteorology , blood pressure , history
Low glycemic index (GI) carbohydrates (CHO) may be superior to high GI CHO if consumed before exercise by providing a prolonged energy source and sparing muscle CHO. We compared pre‐exercise feeding with: 1) a low GI lentil‐based sports nutrition bar; 2) a commercially‐available moderate GI sports nutrition bar with a similar macronutrient content; and 3) diet jelly (placebo) on metabolism and performance during endurance cycling. Using a randomized, counterbalanced, cross‐over design, endurance athletes (n=6) consumed 1.5 g/kg available CHO from a lentil bar, the commercially‐available bar, or consumed placebo 1h before endurance cycling (75min, 65% of max aerobic power), followed by a 7km time trial. We also compared post‐exercise consumption of these bars on next‐day exercise performance as an assessment of recovery. Each feeding condition was separated by 1wk. Respiratory exchange ratio (RER) during the last 10 minutes of the 75min cycling trial was significantly different between conditions with control (0.82 SD 0.01) < lentil bar (0.87 SD 0.04) < commercially‐available bar (0.89 SD 0.03), respectively (p<0.05) indicating more fat oxidation relative to CHO oxidation late in exercise after consumption of the lentil bar compared to the commercially‐available bar. Time trial performance was significantly improved after consumption of the lentil bar (587 SD 42 s) and the commercially available bar (584 SD 61 s) compared to control (618 SD 72 s) (p<0.05). The next‐day recovery time trial performance was better in the lentil bar condition (547 SD 23 s) compared to the commercially‐available bar (568 SD 29 s) and control (566 SD 34 s) (p<0.05). A low GI lentil‐based sports bar offers a metabolic advantage during endurance exercise (i.e. lower RER) and enhances recovery following exercise compared to a moderate GI sports nutrition bar.