School of Healthcare Science, John Dalton Building, Manchester Metropolitan University, Manchester, United Kingdom.
J Strength Cond Res. 2021 Jan 1;35(1):64-71. doi: 10.1519/JSC.0000000000002496.
Bagley, L, Al-Shanti, N, Bradburn, S, Baig, O, Slevin, M, and McPhee, JS. Sex comparison of knee extensor size, strength, and fatigue adaptation to sprint interval training. J Strength Cond Res 35(1): 64-71, 2021-Regular sprint interval training (SIT) improves whole-body aerobic capacity and muscle oxidative potential, but very little is known about knee extensor anabolic or fatigue resistance adaptations, or whether effects are similar for men and women. The purpose of this study was to compare sex-related differences in knee extensor size, torque-velocity relationship, and fatigability adaptations to 12-week SIT. Sixteen men and 15 women (mean [SEM] age: 41 [±2.5] years) completed measurements of total body composition assessed by dual energy X-ray absorptiometry, quadriceps muscle cross-sectional area (CSAQ) assessed by magnetic resonance imaging, the knee extensor torque-velocity relationship (covering 0-240°·s-1) and fatigue resistance, which was measured as the decline in torque from the first to the last of 60 repeated concentric knee extensions performed at 180°·s-1. Sprint interval training consisted of 4 × 20-second sprints on a cycle ergometer set at an initial power output of 175% of power at V̇o2max, 3 times per week for 12 weeks. Quadriceps muscle cross-sectional area increased by 5% (p = 0.023) and fatigue resistance improved 4.8% (p = 0.048), with no sex differences in these adaptations (sex comparisons: p = 0.140 and p = 0.282, respectively). Knee extensor isometric and concentric torque was unaffected by SIT in both men and women (p > 0.05 for all velocities). Twelve-week SIT, totaling 4 minutes of very intense cycling per week, significantly increased fatigue resistance and CSAQ similarly in men and women, but did not significantly increase torque in men or women. These results suggest that SIT is a time-effective training modality for men and women to increase leg muscle size and fatigue resistance.
巴格利、L、阿尔-沙提、N、布拉德伯恩、S、拜格、O、斯莱文、M 和麦克菲、JS。比较性别对短跑间歇训练的膝关节伸肌大小、力量和疲劳适应的影响。J 力量与调节研究 35(1):64-71，2021-常规短跑间歇训练（SIT）可提高全身有氧能力和肌肉氧化能力，但对膝关节伸肌合成代谢或抗疲劳适应的了解甚少，也不知道这些影响是否对男性和女性相似。本研究的目的是比较 12 周 SIT 后膝关节伸肌大小、扭矩-速度关系和疲劳性适应的性别差异。16 名男性和 15 名女性（平均[SEM]年龄：41[±2.5]岁）完成了双能 X 射线吸收法评估的全身成分测量、磁共振成像评估的股四头肌横截面积（CSAQ）、膝关节伸肌扭矩-速度关系（涵盖 0-240°·s-1）和疲劳阻力，疲劳阻力测量为以 180°·s-1 进行的 60 次重复向心膝关节伸展运动的第一次和最后一次之间的扭矩下降。Sprint 间歇训练包括在初始功率输出为 V̇o2max 的 175%的自行车测力计上进行 4 次 20 秒冲刺，每周 3 次，共 12 周。股四头肌横截面积增加了 5%（p=0.023），疲劳阻力提高了 4.8%（p=0.048），这些适应在性别上没有差异（性别比较：p=0.140 和 p=0.282）。在男性和女性中，SIT 对膝关节等长和向心扭矩没有影响（所有速度下 p>0.05）。12 周 SIT，每周总共进行 4 分钟非常剧烈的自行车运动，显著增加了男性和女性的疲劳阻力和 CSAQ，但对男性或女性的扭矩没有显著增加。这些结果表明，SIT 是一种有效的训练方式，可使男性和女性的腿部肌肉大小和疲劳抵抗力得到提高。
