Department of Kinesiology, California State University, Northridge, California.
Department of Physical Education, Mogi Guacu University, Mogi Guacu, Brazil; and.
J Strength Cond Res. 2021 Dec 1;35(12):3322-3326. doi: 10.1519/JSC.0000000000003333.
Marchetti, PH, Magalhaes, RA, Gomes, WA, da Silva, JJ, Stecyk, SD, and Whiting, WC. Different knee and ankle positions affect force and muscle activation during prone leg curl in trained subjects. J Strength Cond Res 35(12): 3322-3326, 2021-Different joint positions for biarticular muscles may affect force and muscular activity during single-joint exercises. The aim of this study was to compare the maximal isometric contractions and muscle activation in 2 different knee and ankle positions during prone leg curl exercise in trained subjects. Fifteen resistance-trained men (27 ± 4 years, 178.80 ± 5.72 cm, 86.87 ± 12.51 kg) were recruited. The peak force (PF) and muscle activation of biceps femoris, gastrocnemius lateralis (GL), and soleus lateralis (SL) were measured during knee flexion at 0 and 90° and maximal dorsiflexion (D) or plantarflexion (P). Three maximal voluntary isometric contractions of 5 seconds were performed for each combination of knee and ankle positions. Two-way repeated-measures analysis of variances were used for all dependent variables. For PF, there was a significant difference between ankle positions (D × P) at 90° (p = 0.009) and knee positions (0 × 90°) for D (p < 0.001) and P (p < 0.001). Peak force was greater with the knee at 0° and the ankle maximally dorsiflexed. For GL, there was a significant difference between ankle (D × P) at 0° (p = 0.002) and knee positions (0 × 90°) for D (p = 0.005). Gastrocnemius lateralis activation was greater with the knee at 90° of flexion and the ankle maximally dorsiflexed. For SL, there was a significant difference between ankle positions (D × P): at 90° (p = 0.001) and at 0° (p = 0.002). Soleus lateralis is more active in plantarflexion irrespective of the knee joint position. Isometric contractions with full knee extension produce more strength regardless of the ankle position; neither the knee position nor the ankle position may influence the activity of the hamstrings.
马切蒂、PH、马加良斯、RA、戈麦斯、WA、席尔瓦、JJ、斯特西克、SD 和惠廷，WC。不同的膝关节和踝关节位置会影响训练有素的受试者在俯卧腿弯举时的力量和肌肉激活。《力量与调节研究杂志》35（12）：3322-3326，2021-双关节肌肉的不同关节位置可能会影响单关节运动中的力量和肌肉活动。本研究的目的是比较在训练有素的受试者进行俯卧腿弯举时，在 2 种不同的膝关节和踝关节位置下的最大等长收缩和肌肉激活。招募了 15 名阻力训练男性（27 ± 4 岁，178.80 ± 5.72 cm，86.87 ± 12.51 kg）。在膝关节屈曲 0°和 90°以及最大背屈（D）或跖屈（P）时，测量了股二头肌、腓肠肌外侧（GL）和比目鱼肌外侧（SL）的峰值力（PF）和肌肉激活。每个膝关节和踝关节位置组合进行 3 次 5 秒的最大自主等长收缩。对所有依赖变量使用双因素重复测量方差分析。对于 PF，在踝关节位置（D×P）（90°）（p=0.009）和膝关节位置（0°×90°）（p<0.001）和 P（p<0.001）之间存在显著差异。当膝关节为 0°且踝关节最大背屈时，PF 更大。对于 GL，在踝关节位置（D×P）（0°）（p=0.002）和膝关节位置（0°×90°）（p=0.005）之间存在显著差异。当膝关节屈曲 90°且踝关节最大背屈时，腓肠肌外侧的激活更大。对于 SL，在踝关节位置（D×P）：90°（p=0.001）和 0°（p=0.002）之间存在显著差异。无论膝关节位置如何，比目鱼肌在跖屈时更活跃。无论踝关节位置如何，完全伸展膝关节的等长收缩都会产生更大的力量；膝关节位置和踝关节位置都不会影响腘绳肌的活动。
