Transferability of Exercise Intensity Based on Muscle Oxygenation from Normoxia to Hypoxia in Ski-Mountaineering Athletes-Exploratory Study.

IF 2.2 Q2 SPORT SCIENCES
Sports Pub Date : 2024-12-18 DOI:10.3390/sports12120351
Kinga Rębiś, Tomasz Kowalski, Kamil Michalik, Andrzej Klusiewicz
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Abstract

Frequent changes in altitude and oxygen levels limit the practical application of traditionally derived exercise thresholds or training zones based on heart rate (HR) or blood lactate concentration (bLa). We investigated the transferability of a muscle oxygenation (SmO2)-based intensity prescription between different hypoxic conditions to assess the suitability of real-time SmO2 measurements for ski-mountaineering (SKIMO) athletes during submaximal endurance exercise. A group of 15 well-trained male SKIMO athletes performed a graded-intensity run test in normoxia (87 m ASL, FiO2 = 20.8%) to determine the anaerobic threshold (AnT) with the mod-Dmax method, and maximal lactate steady state (MLSS) assessments in acute normobaric hypoxia (3000 m ASL, FiO2 = 14.4%) with the intensity aligned to 90-105% of SmO2 at the normoxia-determined AnT. SmO2, HR, and bLa were monitored during both tests. The number of MLSS assessments without a bLa increase over 1 mmol·L-1 was reported. Paired t-tests with Cohen's d effect sizes and intraclass correlation coefficient (ICC) were computed to compare the bLa and HR at the AnT in normoxia and MLSS averages in hypoxia, as both corresponded to equivalent SmO2. Out of the 15 MLSS assessments, 11 (73.3%) were performed without a bLa increase over 1 mmol·L-1. Significant differences at equivalent SmO2 in normoxia and hypoxia were found for HR (175 ± 11.7 vs. 160 ± 14.2 bpm, p = 0.005, d = 1.02), but not for bLa (4.9 ± 1.2 vs. 5.1 ± 2.4 mmol·L-1, p = 0.845, d = -0.05). ICC(2,k) for HR and bLa were 0.56 (95% CI: -0.24, 0.85) and 0.40 (95% CI: -0.75, 0.80), respectively. The results indicate a fair transferability of a SmO2-based intensity prescription between different hypoxic conditions in well-trained SKIMO athletes during submaximal endurance exercise. The practical significance of the observations depends on the required accuracy of the exercise intensity determination.

滑雪-登山运动员基于肌肉氧合从常氧到缺氧的运动强度转移的探索性研究。
海拔高度和氧气水平的频繁变化限制了传统的基于心率(HR)或血乳酸浓度(bLa)的运动阈值或训练区域的实际应用。我们研究了基于肌肉氧合(SmO2)的强度处方在不同缺氧条件下的可转移性,以评估实时SmO2测量对滑雪登山(SKIMO)运动员在亚极限耐力运动中的适用性。15名训练有素的男性SKIMO运动员在常氧条件下(87 m ASL, FiO2 = 20.8%)进行了分级强度跑步试验,用mod-Dmax法测定无氧阈值(AnT),并在急性常压缺氧条件下(3000 m ASL, FiO2 = 14.4%)进行了最大乳酸稳态(MLSS)评估,在常氧条件下测定的AnT强度为SmO2的90-105%。在两个试验期间监测SmO2、HR和bLa。报告了bLa未升高超过1 mmol·L-1的MLSS评估数量。使用Cohen's d效应大小和类内相关系数(ICC)进行配对t检验,比较常氧状态下AnT的bLa和HR与低氧状态下的MLSS平均值,因为两者都对应等效的SmO2。在15例MLSS评估中,11例(73.3%)的bLa升高未超过1 mmol·L-1。常氧和低氧条件下,等量SmO2的HR差异有统计学意义(175±11.7 vs 160±14.2 bpm, p = 0.005, d = 1.02), bLa差异无统计学意义(4.9±1.2 vs 5.1±2.4 mmol·L-1, p = 0.845, d = -0.05)。HR和bLa的ICC(2,k)分别为0.56 (95% CI: -0.24, 0.85)和0.40 (95% CI: -0.75, 0.80)。结果表明,训练有素的SKIMO运动员在亚极限耐力运动中,基于smo2的强度处方在不同缺氧条件下具有公平的可转移性。观察结果的实际意义取决于所要求的运动强度测定的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Sports
Sports SPORT SCIENCES-
CiteScore
4.10
自引率
7.40%
发文量
167
审稿时长
11 weeks
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