Effects of Caffeine Ingestion on Pulmonary V˙O2 Kinetics and Muscle Fatigue During Severe-Intensity Cycling Exercise.

IF 3 3区医学 Q2 NUTRITION & DIETETICS

International journal of sport nutrition and exercise metabolism Pub Date : 2024-11-08 DOI:10.1123/ijsnem.2024-0141

Rafael Leal Dantas Estrela, Jean de Souza Dos Santos, Paulo Cesar do Nascimento Salvador, Thiago Pereira Ventura, Gustavo Oneda, Ricardo Dantas de Lucas, Tiago Turnes, Luiz Guilherme Antonacci Guglielmo

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引用次数: 0

Abstract

Introduction: This study aimed to analyze the effect of caffeine (CAF) intake on pulmonary oxygen uptake (V˙O2) kinetics, muscle fatigue, and physiological and perceptual parameters during severe-intensity cycling exercise.

Methods: Twelve physically active men (age: 26 ± 5 years; V˙O2peak: 46.7 ± 7.8 ml·kg-1·min-1) participated of this placebo (PLA)-controlled, randomized, double-blinded, and crossover design study. Participants performed on separate days (a) a ramp incremental test to determine V˙O2peak and gas exchange threshold and (b) four 8-min constant work rate tests at 60% of the difference between gas exchange threshold and maximal V˙O2peak (i.e., Δ60%) 1 hr after taking either 6 mg/kg of body mass of CAF or PLA. Before and immediately after constant work rate tests, a 5-s all-out isokinetic sprint was performed to assess the muscle torque. V˙O2 kinetics, blood lactate concentration ([La]), and rating of perceived exertion were analyzed during constant work rate tests.

Results: CAF did not alter the primary time constant of V˙O2 kinetics (PLA: 38.3 ± 14; CAF: 36.7 ± 7.5 s), V˙O2 slow component (PLA: 0.5 ± 0.2; CAF: 0.5 ± 0.2 L/min), or peak torque (PLA: 144.6 ± 18.6; CAF: 143.9 ± 18.7 N·m). CAF decreased rating of perceived exertion (15.9 ± 1.8 vs. 17.0 ± 1.5 a.u.) and increased blood lactate concentration (9.0 ± 2.5 vs. 8.3 ± 2.2 mmol/L; p < .05) after constant work rate tests compared with PLA.

Conclusion: CAF ingestion does not alter V˙O2 kinetics or muscle torque production during 8 min of severe-intensity cycling exercise.

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摄入咖啡因对高强度自行车运动中肺部 V˙O2动力学和肌肉疲劳的影响

简介本研究旨在分析咖啡因（CAF）摄入对高强度自行车运动中肺氧摄氧动力学、肌肉疲劳以及生理和感知参数的影响：12 名运动量大的男性（年龄：26 ± 5 岁；V˙O2 峰值：46.7 ± 7.8 ml-kg-1-min-1）参加了这项安慰剂（PLA）对照、随机、双盲和交叉设计的研究。参加者在不同的日期分别进行了（a）斜坡递增测试，以确定 V˙O2峰和气体交换阈值；（b）在服用 6 毫克/千克体重的 CAF 或 PLA 1 小时后，在气体交换阈值与最大 V˙O2峰之差的 60% （即 Δ60%）的条件下进行了 4 次 8 分钟恒定工作速率测试。在恒定工作率测试之前和之后，立即进行 5 秒钟全力等速冲刺，以评估肌肉扭矩。在恒定工作速率测试期间，对 V˙O2动力学、血液乳酸浓度（[La]）和感觉用力程度进行了分析：CAF没有改变V˙O2动力学的主要时间常数（PLA：38.3 ± 14；CAF：36.7 ± 7.5 s）、V˙O2慢速成分（PLA：0.5 ± 0.2；CAF：0.5 ± 0.2 L/min）或峰值扭矩（PLA：144.6 ± 18.6；CAF：143.9 ± 18.7 N-m）。与 PLA 相比，CAF 降低了感知用力等级（15.9 ± 1.8 vs. 17.0 ± 1.5 a.u.），并增加了恒定工作速率测试后的血液乳酸浓度（9.0 ± 2.5 vs. 8.3 ± 2.2 mmol/L；p < .05）：结论：摄入 CAF 不会改变 8 分钟高强度自行车运动的 V˙O2 动力学或肌肉扭矩产生。

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来源期刊

International journal of sport nutrition and exercise metabolism 医学-营养学

CiteScore

5.00

自引率

8.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The International Journal of Sport Nutrition and Exercise Metabolism (IJSNEM) publishes original scientific investigations and scholarly reviews offering new insights into sport nutrition and exercise metabolism, as well as articles focusing on the application of the principles of biochemistry, physiology, and nutrition to sport and exercise. The journal also offers editorials, digests of related articles from other fields, research notes, and reviews of books, videos, and other media releases. To subscribe to either the print or e-version of IJSNEM, press the Subscribe or Renew button at the top of your screen.