长时间跑步恢复期间碳水化合物摄入对后续运动中肌肉糖原代谢的影响。

Effect of carbohydrate feeding during recovery from prolonged running on muscle glycogen metabolism during subsequent exercise.

作者信息

Tsintzas K, Williams C, Boobis L, Symington S, Moorehouse J, Garcia-Roves P, Nicholas C

机构信息

Human Muscle Metabolism Research Group, Loughborough University, Loughborough, UK.

出版信息

Int J Sports Med. 2003 Aug;24(6):452-8. doi: 10.1055/s-2003-41181.

DOI:10.1055/s-2003-41181

PMID:12905095

Abstract

This study examined the effect of carbohydrate (CHO) intake during a 4 h recovery from prolonged running on muscle glycogen metabolism during subsequent exercise. On 2 occasions, 7 male subjects ran for 90 min at 70 % maximum oxygen uptake VO(2 max) on a motorized treadmill (R1) followed by a 4 h rest period (REC) and a 15 min run (R2) consisting of 5 min at 60 % and 10 min at 70 % VO(2 max) During REC, each subject ingested a total of 2.7 l of an isotonic solution containing either 50 g of CHO (LOW) or 175 g of CHO (HIGH). Biopsy samples were obtained from the vastus lateralis immediately after R1, REC and R2. During REC, a higher muscle glycogen resynthesis was observed in HIGH when compared with LOW trial (75 +/- 20 vs. 31 +/- 11 mmol x kg dry matter (dm) -1, respectively; p < 0.01). Muscle glycogen utilization during R2 was similar between the HIGH and LOW trials (39 +/- 10 vs. 46 +/- 11 mmol x kg dm -1, respectively). These results suggest that ingestion of a large amount of CHO at frequent intervals during recovery from exercise does not affect the rate of muscle glycogen utilization during subsequent exercise.

摘要

本研究探讨了长时间跑步4小时恢复期间碳水化合物（CHO）摄入对后续运动中肌肉糖原代谢的影响。7名男性受试者在电动跑步机上以最大摄氧量（VO₂max）的70%跑90分钟（R1），随后休息4小时（REC），接着进行15分钟跑步（R2），包括60%VO₂max跑5分钟和70%VO₂max跑10分钟。在REC期间，每名受试者摄入总量为2.7升的等渗溶液，其中一组含有50克CHO（低剂量组），另一组含有175克CHO（高剂量组）。在R1、REC和R2结束后立即从股外侧肌获取活检样本。在REC期间，与低剂量组相比，高剂量组观察到更高的肌肉糖原再合成（分别为75±20与31±11 mmol·kg干物质（dm）⁻¹；p<0.01）。高剂量组和低剂量组在R2期间的肌肉糖原利用率相似（分别为39±10与46±11 mmol·kg dm⁻¹）。这些结果表明，运动恢复期间频繁摄入大量CHO不会影响后续运动中肌肉糖原的利用速率。