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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >The Influence of Age and Obesity-Altered Muscle Tissue Composition on Muscular Dimensional Changes: Impact on Strength and Function
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The Influence of Age and Obesity-Altered Muscle Tissue Composition on Muscular Dimensional Changes: Impact on Strength and Function

机译：年龄和肥胖改变的肌肉组织成分对肌肉尺寸变化的影响：对力量和功能的影响

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The purpose of this study was to determine if muscular dimensional changes with increases in torque production are influenced by age- and obesity-related increases in intramuscular fat, and its relationship to percent body fat (%BF), echo intensity (EI), strength, and maximum walking speed. Sixty-six healthy men were categorized into 3 groups based on age and body mass index status (young normal weight [YNW], older normal weight [ONW], and older obese [OB]). Participants underwent %BF assessments, resting ultrasonography to determine muscle size (cross-sectional area [CSA]) and EI of the superficial quadriceps, and a 10-m maximum walking speed assessment. Maximal and submaximal (rest-100% MVC in 10% increments) isometric leg extension strength was assessed while changes in rectus femoris (RF) CSA, width, and depth were obtained with ultrasonography. Echo intensity and %BF were different among all groups (p <= .007), with the YNW and OB groups exhibiting the lowest and highest %BF and EI values, respectively. The RF increased in depth and decreased in width with increases in torque intensity for all groups. The ONW group demonstrated no change (-0.08%) in RF CSA across torque intensities, whereas the YNW group (-11.5%) showed the greatest decrease in CSA, and the OB group showed a more subtle decrease (-4.6%). Among older men, a greater change in RF CSA was related to poorer EI (r = -0.355) and higher %BF (r = -0.346), while a greater decrease in RF width was associated with faster walking speeds (r = -0.431). Examining muscular dimensional changes during contraction is a unique model to investigate the influence of muscle composition on functional performance.
机译：本研究的目的是确定随着扭矩产生的增加，肌肉尺寸的变化是否受年龄和肥胖相关的肌内脂肪增加的影响，及其与体脂百分比（%BF）、回声强度（EI）、力量和最大步行速度的关系。根据年龄和体重指数状况（年轻正常体重[YNW]、老年正常体重[ONW]和老年肥胖[OB]），将66名健康男性分为3组。参与者接受%BF评估、静息超声检查以确定浅四头肌的肌肉大小（横截面积[CSA]）和EI，以及10米最大步行速度评估。评估最大和次最大（静息-100%MVC，增量10%）等长腿部伸展强度，同时通过超声检查获得股直肌（RF）CSA、宽度和深度的变化。回声强度和%BF在所有组中都不同（p<0.007），YNW组和OB组分别显示最低和最高的%BF和EI值。随着扭矩强度的增加，所有组的RF深度增加，宽度减少。在扭矩强度方面，ONW组的RF-CSA没有变化（-0.08%），而YNW组（-11.5%）的CSA下降幅度最大，OB组的下降幅度更为轻微（-4.6%）。在老年男性中，RF CSA的较大变化与较差的EI（r=-0.355）和较高的BF（r=-0.346）有关，而RF宽度的较大减少与较快的步行速度（r=-0.431）有关。检查肌肉收缩时的尺寸变化是研究肌肉成分对功能表现影响的独特模型。

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