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首页> 外文期刊>Kinesiology: international scientific journal of kinesiology and sport >DIFFERENCES IN MUSCLE OXYGENATION BETWEEN YOUNG AND MIDDLE-AGED RECREATIONALLY ACTIVE MEN DURING HIGH-VOLUME RESISTANCE EXERCISE
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DIFFERENCES IN MUSCLE OXYGENATION BETWEEN YOUNG AND MIDDLE-AGED RECREATIONALLY ACTIVE MEN DURING HIGH-VOLUME RESISTANCE EXERCISE

机译：高容量阻力锻炼中年轻和中年娱乐活动男性的肌肉氧合作用差异

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摘要

The aim of this study was to compare muscle oxygenation of the vastus lateralis during a high-volume isokinetic resistance exercise protocol (HVP) between young adult (YA) and middle-aged adult (MA) men. Twenty recreationally trained men were assigned to either the YA (age 21.8±2.0 years, body mass 90.7±11.6 kg, body height 179±4.7 cm) or MA (age 47.0±4.4 years, body mass 96.1±21.6 kg, body height 177±7.7 cm) group. The HVP consisted of eight sets of 10 repetitions of unilateral isokinetic concentric knee extension and eccentric knee flexion at 60°·s-1. Changes in tissue hemoglobin saturation index (TSI), tissue oxygenated hemoglobin concentration (O2Hb), deoxygenated hemoglobin (HHb), and muscle oxidation index (O2Hb-HHb) were measured during the exercise session using the near-infrared spectroscopy (NIRS). Data were analyzed using two-way mix factorial analyses of variance. Prior to exercise, TSI was significantly greater (p=.024) for YA compared to MA. Significant decreases in O2Hb and O2Hb-HHb and increases in HHb were observed during each of the eight sets relative to the rest periods (p<.05) for both groups. The average change during the eight sets of the HVP revealed a significantly higher (p=.036) level of HHb and a lower (p=.029) level of O2Hb-HHb for MA compared to YA. A significant negative correlation was also noted at baseline between O2Hb-HHb index and the cross-sectional area of the vastus lateralis muscle (r=-.45, p=.045). During a high- volume resistance exercise, MA experienced reduced muscle oxygen saturation levels compared to YA. These results may be attributed to reductions in local tissue oxidative capacity and reduced blood delivery occurring during middle-age, and possibly due to group differences in muscle morphology.
机译：这项研究的目的是比较年轻成年（YA）和中年成年（MA）男性在大容量等速阻力运动规程（HVP）期间股外侧肌的肌肉氧合作用。 20名接受过休闲训练的男性被指定为YA（年龄21.8±2.0岁，体重90.7±11.6 kg，体重179±4.7 cm）或MA（年龄47.0±4.4岁，体重96.1±21.6 kg，体重177） ±7.7 cm）组。 HVP包括八组，每组10次重复，分别为60°·s-1的单侧等速同心膝盖伸展和偏心膝盖弯曲。在运动过程中，使用近红外光谱法（NIRS）测量了组织血红蛋白饱和度指数（TSI），组织氧合血红蛋白浓度（O2Hb），脱氧血红蛋白（HHb）和肌肉氧化指数（O2Hb-HHb）的变化。使用方差的双向混合因子分析来分析数据。运动前，与MA相比，YA的TSI显着更大（p = .024）。相对于休息时间，两组在八组中的每组中O2Hb和O2Hb-HHb均显着下降，而HHb则显着上升（p <.05）。与YA相比，MA的八组HVP中的平均变化显示MA的HHb水平显着较高（p = .036），O2Hb-HHb的水平较低（p = .029）。在基线时，O2Hb-HHb指数与股外侧肌截面积之间也存在显着的负相关性（r =-。45，p = .045）。在高容量阻力运动中，MA的肌肉氧饱和度水平低于YA。这些结果可能归因于中年时局部组织氧化能力的降低和血液输送的减少，并且可能归因于肌肉形态的群体差异。

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