School of Health Sciences, TecnoCampus Pompeu Fabra University, Ernest Lluch, 32 (Porta Laietana), 08302 Mataró-Barcelona, Spain.
Campus Docent Sant Joan de Déu, Fundación Privada, 08304 Barcelona, Spain.
Nutrients. 2021 Mar 27;13(4):1094. doi: 10.3390/nu13041094.
The assessment of ventilatory efficiency is critical to understanding the matching of ventilation (VE) and perfusion in the lungs during exercise. This study aimed to establish a causal physiological relationship between ventilatory efficiency and resistance exercise performance after beetroot juice (BJ) intake. Eleven well-trained males performed a resistance exercise test after drinking 140 mL of BJ (~12.8 mmol NO) or a placebo (PL). Ventilatory efficiency was assessed by the VE•VCO slope, the oxygen uptake efficiency slope and the partial pressure of end-tidal carbon dioxide (PetCO). The two experimental conditions were controlled using a randomized, double-blind crossover design. The resistance exercise test involved repeating the same routine twice, which consisted of wall ball shots plus a full squat (FS) with a 3 min rest or without a rest between the two exercises. A higher weight lifted was detected in the FS exercise after BJ intake compared with the PL during the first routine ( = 0.004). BJ improved the VE•VCO slope and the PetCO during the FS exercise in the first routine and at rest ( < 0.05). BJ intake improved the VE•VCO slope and the PetCO coinciding with the resistance exercise performance. The ergogenic effect of BJ could be induced under aerobic conditions at rest.
通气效率评估对于理解运动时肺部通气（VE）与灌注的匹配至关重要。本研究旨在确定饮用甜菜根汁（BJ）后通气效率与抗阻运动表现之间的因果生理关系。11 名训练有素的男性在饮用 140 毫升 BJ（~12.8mmolNO）或安慰剂（PL）后进行抗阻运动测试。通过 VE•VCO 斜率、摄氧量效率斜率和呼气末二氧化碳分压（PetCO）评估通气效率。采用随机、双盲交叉设计控制两种实验条件。抗阻运动测试包括两次重复相同的运动，包括壁球射击和深蹲（FS），两次之间休息 3 分钟或不休息。与 PL 相比，BJ 摄入后 FS 运动中第一次重复时举起的重量更高（=0.004）。BJ 改善了 FS 运动中第一次重复和休息时的 VE•VCO 斜率和 PetCO（<0.05）。BJ 摄入改善了与抗阻运动表现一致的 VE•VCO 斜率和 PetCO。BJ 的促力作用可以在休息时的有氧条件下诱发。
