Similar performance after intake of carbohydrate plus whey protein and carbohydrate only in the early phase after non-exhaustive cycling.

Autor: Sollie O; Department of Physical Performance, Norwegian School of Sports Sciences, Oslo, Norway., Clauss M; Department of Physical Performance, Norwegian School of Sports Sciences, Oslo, Norway., Jeppesen PB; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark., Tangen DS; Department of Physical Performance, Norwegian School of Sports Sciences, Oslo, Norway., Johansen EI; Department of Physical Performance, Norwegian School of Sports Sciences, Oslo, Norway., Skålhegg BS; Section for Molecular Nutrition, Department of Nutrition, University of Oslo, Oslo, Norway., Ivy JL; Department of Kinesiology and Health Education, University of Texas at Austin, Austin, Texas, USA., Jensen J; Department of Physical Performance, Norwegian School of Sports Sciences, Oslo, Norway.
Jazyk: angličtina
Zdroj: Scandinavian journal of medicine & science in sports [Scand J Med Sci Sports] 2023 Jul; Vol. 33 (7), pp. 1091-1103. Date of Electronic Publication: 2023 Apr 11.
DOI: 10.1111/sms.14364
Abstrakt: Aim: The aim of the present study was to compare performance 5 h after a 90-min endurance training session when either carbohydrate only or carbohydrate with added whey hydrolysate or whey isolate was ingested during the first 2 h of the recovery period.
Methods: Thirteen highly trained competitive male cyclists completed three exercise and diet interventions (double-blinded, randomized, crossover design) separated by 1 week. The 90-min morning session (EX1) included a 60 min time-trial (TT 60 ). Immediately and 1 h after exercise, participants ingested either (1) 1.2 g carbohydrate∙kg -1 ∙h -1 (CHO), (2) 0.8 g carbohydrate∙kg -1 ∙h -1  + 0.4 g isolate whey protein∙kg -1 ∙h -1 (ISO) or (3) 0.8 g carbohydrate∙kg -1 ∙h -1  + 0.4 g hydrolysate whey protein∙kg -1 ∙h -1 (HYD). Additional intakes were identical between interventions. After 5 h of recovery, participants completed a time-trial performance (TT P ) during which a specific amount of work was performed. Blood and urine were collected throughout the day.
Results: TT P did not differ significantly between dietary interventions (CHO: 43:54 ± 1:36, ISO: 46:55 ± 2:32, HYD: 44:31 ± 2:01 min). Nitrogen balance during CHO was lower than ISO (p < 0.0001) and HYD (p < 0.0001), with no difference between ISO and HYD (p = 0.317). In recovery, the area under the curve for blood glucose was higher in CHO compared to ISO and HYD. HR, VO 2 , RER, glucose, and lactate during EX2 were similar between interventions.
Conclusion: Performance did not differ after 5 h of recovery whether carbohydrate only or isocaloric carbohydrate plus protein was ingested during the first 2 h. Correspondingly, participants were not in negative nitrogen balance in any dietary intervention.
(© 2023 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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