Université de Lyon, UJM-Saint-Etienne, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, F-42023 Saint-Etienne, France.
Université de Lyon, UJM-Saint-Etienne, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, F-42023 Saint-Etienne, France.
J Electromyogr Kinesiol. 2021 Feb;56:102503. doi: 10.1016/j.jelekin.2020.102503. Epub 2020 Nov 19.
The quadriceps-intermittent-fatigue (QIF) test assesses knee extensors strength, endurance and performance fatigability in isometric condition. We aimed to assess reliability and agreement for this test in dynamic conditions and with the use of transcranial magnetic stimulation. On two separate sessions, 20 young adults (25 ± 4 yr, 10 women) performed stages of 100 knee extensors concentric contractions at 120°/s (60° range-of-motion) with 10% increments of the initial maximal concentric torque until exhaustion. Performance fatigability across the test was quantified as maximal isometric and concentric torque loss, and its mechanisms were investigated through the responses to transcranial magnetic and electrical stimulations. Reliability and agreement were assessed using ANOVAs, coefficients of variation (CVs) and intra-class correlation coefficients (ICCs) with 95% CI. Good inter-session reliability and high agreement were found for number of contractions [489 ± 75 vs. 503 ± 95; P = 0.20; ICC = 0.85 (0.66; 0.94); CV = 5% (3; 7)] and total work [11,285 ± 4,932 vs. 11,792 ± 5838 Nm.s; P = 0.20; ICC = 0.95 (0.87; 0.98); CV = 8% (5; 11)]. Poor reliability but high agreement were observed for isometric [-33 ± 6 vs. -31 ± 7%; P = 0.13; ICC = 0.47 (0.05; 0.75); CV = 6% (4;8)] and concentric [-20 ± 11% vs. -19 ± 9%; P = 0.82; ICC = 0.26 (-0.22; 0.63); CV = 9% (6; 12)] torque loss. The dynamic QIF test represents a promising tool for neuromuscular evaluation in isokinetic mode.
四头肌间歇性疲劳 (QIF) 测试评估等长条件下膝关节伸肌的力量、耐力和运动疲劳性。我们旨在评估在动态条件下和使用经颅磁刺激时，这种测试的可靠性和一致性。在两个单独的测试中，20 名年轻成年人（25±4 岁，10 名女性）以 120°/s（60°运动范围）的速度进行了 100 次膝关节伸肌向心收缩阶段，初始最大向心扭矩增加 10%，直至力竭。通过经颅磁刺激和电刺激的反应来研究测试过程中的运动疲劳性，其机制表现为最大等长和向心扭矩损失。使用方差分析、变异系数 (CV) 和 95%置信区间的组内相关系数 (ICC) 来评估可靠性和一致性。发现组间测试具有良好的可靠性和高度的一致性，表现为收缩次数[489±75 次比 503±95 次；P=0.20；ICC=0.85（0.66；0.94）；CV=5%（3%；7%）]和总功[11285±4932 比 11792±5838 Nm·s；P=0.20；ICC=0.95（0.87；0.98）；CV=8%（5%；11%）]。虽然可靠性较差，但一致性仍较高，表现在等长[33±6%比 31±7%；P=0.13；ICC=0.47（0.05；0.75）；CV=6%（4%；8%）]和向心[20±11%比 19±9%；P=0.82；ICC=0.26（-0.22；0.63）；CV=9%（6%；12%）]扭矩损失方面。动态 QIF 测试是一种有前途的等速模式下神经肌肉评估工具。
