Bioperformance & Nutrition Research Unit, Bettery S.A., 2740-262 Lisbon, Portugal.
CIDEFES-Universidade Lusófona, 1749-024 Lisboa, Portugal.
Int J Environ Res Public Health. 2021 Jun 21;18(12):6649. doi: 10.3390/ijerph18126649.
An increasing body of evidence indicates that the phase angle (PhA) can be applied as a marker of nutritional status, disease prognosis, and mortality probability. Still, it is not known whether PhA can be used as an indicator of muscular quantity and strength and maximal aerobic capacity in overweight/obese former highly active individuals, an understudied population. This study aimed to analyze the association between PhA with skeletal muscle mass, maximal isometric strength, and maximal aerobic capacity through VO2max, in overweight/obese and inactive former athletes.
Cross-sectional information of 94 (62 males) former adult athletes (age: 43.1 ± 9.4 years old; body mass index: 31.4 ± 4.8 kg/m) taking part in a weight-loss clinical trial was analyzed. Total fat and fat-free mass were determined by dual-energy X-ray absorptiometry, while skeletal muscle mass was predicted from appendicular lean soft tissue. Values for upper- and lower-body maximal isometric strength were assessed by handgrip and leg press dynamometry. VO2max was determined by indirect calorimetry through a graded exercise test performed on a treadmill.
PhA was associated with skeletal muscle mass (r = 0.564, < 0.001), upper-body strength (r = 0.556, < 0.001), lower-body strength (r = 0.422, < 0.001), and VO2max (r = 0.328, = 0.013). These relationships remained significant for skeletal muscle mass (β = 2.158, = 0.001), maximal isometric strength (upper-body: β = 2.846, = 0.012; low-er-body: β = 24.209, = 0.041) after adjusting for age, sex, and fat mass but not for VO2max (β = -0.163, = 0.098).
Our findings indicated that former athletes with higher values of PhA exhibited greater muscle mass and strength, despite sex, age, and body composition, which suggests that this simple raw BI parameter can be utilized as an indicator of muscle quantity and functionality in overweight/obese former athletes.
越来越多的证据表明，相位角（PhA）可以作为营养状况、疾病预后和死亡率概率的标志物。然而，目前尚不清楚 PhA 是否可以用于衡量超重/肥胖的前活跃个体（研究较少的人群）的肌肉量和力量以及最大有氧能力。本研究旨在分析 PhA 与骨骼肌质量、最大等长力量和通过 VO2max 测量的最大有氧能力之间的关系，这些关系在超重/肥胖和不活跃的前运动员中进行分析。
分析了参加减肥临床试验的 94 名（62 名男性）前成年运动员（年龄：43.1 ± 9.4 岁；体重指数：31.4 ± 4.8 kg/m2）的横断面信息。通过双能 X 射线吸收法测定总脂肪和去脂体重，通过四肢瘦软组织预测骨骼肌质量。通过握力和腿推测力计评估上肢和下肢的最大等长力量。通过在跑步机上进行递增运动试验通过间接测热法测定 VO2max。
PhA 与骨骼肌质量（r = 0.564，<0.001）、上肢力量（r = 0.556，<0.001）、下肢力量（r = 0.422，<0.001）和 VO2max（r = 0.328，= 0.013）相关。这些关系在调整年龄、性别和脂肪量后，对于骨骼肌质量（β=2.158，=0.001）和最大等长强度（上肢：β=2.846，=0.012；下肢：β=24.209，=0.041）仍然显著，但对于 VO2max（β=-0.163，=0.098）则不显著。
我们的研究结果表明，PhA 值较高的前运动员表现出更大的肌肉量和力量，尽管存在性别、年龄和身体成分差异，但这表明这个简单的原始 BI 参数可用于衡量超重/肥胖的前运动员的肌肉量和功能。
Zotero 插件