Carbohydrates do not accelerate force recovery after glycogen-depleting followed by high-intensity exercise in humans
Deutscher übersetzter Titel: | Kohlenhydrate beschleunigen nicht die Erholung der Kraftfähigkeit nach Glykogenverbrauch, gefolgt von intensiver körperlicher Betätigung beim Menschen |
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Autor: | Cheng, Arthur J.; Chaillou, Thomas; Kamandulis, Sigitas; Subocius, Andrejus; Westerblad, Håkan; Brazaitis, Marius; Venckūnas, Tomas |
Erschienen in: | Scandinavian journal of medicine & science in sports |
Veröffentlicht: | 30 (2020), 6, S. 998-1007, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0905-7188, 1600-0838 |
DOI: | 10.1111/sms.13655 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU202007005425 |
Quelle: | BISp |
Abstract des Autors
Prolonged low-frequency force depression (PLFFD) induced by fatiguing exercise is characterized by a persistent depression in submaximal contractile force during the recovery period. Muscle glycogen depletion is known to limit physical performance during prolonged low- and moderate-intensity exercise, and accelerating glycogen resynthesis with post-exercise carbohydrate intake can facilitate recovery and improve repeated bout exercise performance. Short-term, high-intensity exercise, however, can cause PLFFD without any marked decrease in glycogen. Here, we studied whether recovery from PLFFD was accelerated by carbohydrate ingestion after 60 minutes of moderate-intensity glycogen-depleting cycling exercise followed by six 30-seconds all-out cycling sprints. We used a randomized crossover study design where nine recreationally active males drank a beverage containing either carbohydrate or placebo after exercise. Blood glucose and muscle glycogen concentrations were determined at baseline, immediately post-exercise, and during the 3-hours recovery period. Transcutaneous electrical stimulation of the quadriceps muscle was performed to determine the extent of PLFFD by eliciting low-frequency (20 Hz) and high-frequency (100 Hz) stimulations. Muscle glycogen was severely depleted after exercise, with a significantly higher rate of muscle glycogen resynthesis during the 3-hours recovery period in the carbohydrate than in the placebo trials (13.7 and 5.4 mmol glucosyl units/kg wet weight/h, respectively). Torque at 20 Hz was significantly more depressed than 100 Hz torque during the recovery period in both conditions, and the extent of PLFFD (20/100 Hz ratio) was not different between the two trials. In conclusion, carbohydrate supplementation enhances glycogen resynthesis after glycogen-depleting exercise but does not improve force recovery when the exercise also involves all-out cycling sprints.