Jaén-Carrillo Diego, García-Pinillos Felipe, Plaza-Florido Abel, Riquelme-Sebastián Leonardo, Fernández-Navarrete Iván, Ruiz-Alias Santiago A
Department of Sport Science, University of Innsbruck, Innsbruck, Austria.
Department of Physical Education and Sport, University of Granada, Granada, Spain.
Am J Hum Biol. 2025 Jan;37(1):e24212. doi: 10.1002/ajhb.24212.
The maximal fat oxidation (MFO) and the exercise intensity that provokes MFO (FATMAX) are inversely associated with cardiometabolic risk factors in healthy young sedentary adults. However, how both cardiorespiratory fitness (CRF) level and sex influence MFO during exercise and the FATMAX is seldom analyzed.
This study is aimed at determining the influence of CRF and sex on MFO.
Twenty healthy young adults (i.e., 12 men and 8 women) completed a graded treadmill protocol to determine MFO, MFO relative to lean mass (MFO), FATMAX and maximum oxygen uptake (VO).
The k-means cluster analysis was used to divide the sample into two different groups for CRF level (56.54 ± 2.54 and 46.94 ± 3.07 mL/kg/min, p < 0.001, respectively). The high-level group revealed higher MFO relative to lean mass (MFO) (3.34 ± 1.44 and 2.73 ± 0.87 g · min · kg, p = 0.001, respectively), and FATMAX in km · h (FATMAX) (7.67 ± 0.90 and 7.00 ± 0.97 km · h, p = 0.044, respectively) but not for MFO (0.67 ± 0.19 and 0.71 ± 0.20 p = 0.124, respectively). When divided for sex, men exhibited higher values for MFO (0.76 ± 0.21 vs. 0.69 ± 0.19 g · min, p = 0.039) and FATMAXv (7.67 ± 0.96 vs. 7.30 ± 0.98 km · h, p = 0.036), while women showed higher values for MFO (3.92 ± 1.35 vs. 2.40 ± 0.46 g · min · kg, p = 0.015).
This study highlights the significant influence of CRF level and sex on MFO and FATMAX, offering valuable insights for tailoring exercise programs and optimizing health and performance interventions.
在健康的久坐不动的年轻成年人中，最大脂肪氧化（MFO）以及引发MFO的运动强度（FATMAX）与心血管代谢风险因素呈负相关。然而，心肺适能（CRF）水平和性别如何在运动过程中影响MFO和FATMAX，却很少有人进行分析。
本研究旨在确定CRF和性别对MFO的影响。
20名健康的年轻成年人（即12名男性和8名女性）完成了一项分级跑步机测试，以确定MFO、相对于去脂体重的MFO（MFO）、FATMAX和最大摄氧量（VO）。
采用k均值聚类分析将样本分为CRF水平不同的两组（分别为56.54±2.54和46.94±3.07毫升/千克/分钟，p<0.001）。高水平组相对于去脂体重的MFO（MFO）更高（分别为3.34±1.44和2.73±0.87克·分钟·千克，p=0.001），FATMAX以千米/小时计（FATMAX）也更高（分别为7.67±0.90和7.00±0.97千米/小时，p=0.044），但MFO无差异（分别为0.67±0.19和0.71±0.20，p=0.124）。按性别划分时，男性的MFO值（0.76±0.21对0.69±0.19克·分钟，p=0.039）和FATMAXv（7.67±0.96对7.30±0.98千米/小时，p=0.036）更高，而女性的MFO（3.92±1.35对2.40±0.46克·分钟·千克，p=0.015）更高。
本研究强调了CRF水平和性别对MFO和FATMAX有显著影响，为制定运动计划以及优化健康和性能干预措施提供了有价值的见解。
