Perception of exercise-induced dyspnea after experimentally induced breathing discomfort.

IF 2.4 4区 医学 Q3 NUTRITION & DIETETICS
Jou-Chung Chang, Sarah Anne Angus, Connor Doherty, Benjamin P Thompson, Leah Mann, Yannick Molgat-Seon, Paolo B Dominelli
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引用次数: 1

Abstract

The perception of dyspnea is influenced by both physiological and psychological factors. We sought to determine whether exertional dyspnea perception could be experimentally manipulated through prior exposure to heightened dyspnea while exercising. We hypothesized that dyspnea perception during exercise would be lower following an induced dyspnea task (IDT). Sixteen healthy participants (eight females, eight males) completed two days of exercise testing. Day 1 involved an incremental cycle exercise test starting at 40 W for females and 60 W for males, increasing by 20 W each minute until volitional exhaustion. Following the maximal exercise test on Day 1, participants completed IDT, involving 5 min of exercise at 70% of peak work rate with 500 mL dead space and external resistance (i.e., 6.8 ± 2.3 cm·H2O·s-1·L-1 inspiration, 3.8 ± 0.7 cm·H2O·s-1·L-1 expiration). Day 2 consisted of an incremental exercise test identical to Day 1. At maximal exercise, there were no differences in oxygen uptake (V̇O2; 44.7 ± 7.7 vs. 46.5 ± 6.3 mL·kg-1·min-1), minute ventilation (120 ± 35 vs. 127 ± 38 L·min-1), dyspnea (6.5 [4, 8.5] vs. 6 [4.25, 8.75]), or leg discomfort (6 [5, 8.75] vs. 7 [5, 9]) between days (all p > 0.05). At 60%-80% of peak V̇O2 (V̇O2peak), dyspnea was significantly lower on Day 2 (-0.75 [-1.375, 0] for 60% and -0.5 [0, -2] for 80%, p < 0.05) despite no differences in relevant physiological variables. The onset of perceived dyspnea occurred at a significantly higher exercise intensity on Day 2 than on Day 1 (42% ± 19% vs. 51% ± 17% V̇O2peak, respectively; p < 0.05). Except for 40% V̇O2peak (p = 0.05), RPE-L was not different at any intensities nor was the onset of perceived leg discomfort different between days (38% ± 14% vs. 43% ± 10% V̇O2peak, respectively; p = 0.10). Exposure to heightened dyspnea alters exercise-induced dyspnea perception during subsequent submaximal exercise bouts.

实验诱导呼吸不适后对运动性呼吸困难的感知。
呼吸困难的感觉受生理和心理因素的影响。我们试图确定是否可以通过先前暴露于运动时呼吸困难加剧的实验来操纵运动性呼吸困难感知。我们假设在进行诱导性呼吸困难任务(IDT)后,运动时的呼吸困难感觉会降低。16名健康参与者(8名女性,8名男性)完成了为期两天的运动测试。第1天包括一个增量循环运动测试,女性从40 W开始,男性从60 W开始,每分钟增加20 W,直到意志衰竭。在第1天的最大运动测试之后,参与者完成IDT,包括以峰值工作率的70%进行5分钟的运动,500 mL死空间和外部阻力(即6.8±2.3 cm·H2O·s-1·L-1吸气,3.8±0.7 cm·H2O·s-1·L-1呼气)。第2天包括与第1天相同的增量运动测试。在最大运动时,两组的摄氧量(V * O2;(44.7±7.7 vs. 46.5±6.3 mL·kg-1·min-1)、分钟通气(120±35 vs. 127±38 L·min-1)、呼吸困难(6.5 [4,8.5]vs. 6[4.25, 8.75])、腿部不适(6 [5,8.75]vs. 7[5,9])。在V氧峰值的60% ~ 80%时,呼吸困难在第2天显著降低(60%为-0.75[-1.375,0],80%为-0.5 [0,-2],p 2peak);RPE-L在任何强度下均无差异(p = 0.05),腿部不适发生率在不同天之间也无差异(分别为38%±14% vs 43%±10%);p = 0.10)。暴露于加剧的呼吸困难会在随后的次剧烈运动中改变运动引起的呼吸困难感觉。
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来源期刊
CiteScore
6.50
自引率
2.90%
发文量
113
审稿时长
4-8 weeks
期刊介绍: Applied Physiology, Nutrition, and Metabolism publishes original research articles, reviews, and commentaries, focussing on the application of physiology, nutrition, and metabolism to the study of human health, physical activity, and fitness. The published research, reviews, and symposia will be of interest to exercise physiologists, physical fitness and exercise rehabilitation specialists, public health and health care professionals, as well as basic and applied physiologists, nutritionists, and biochemists.
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