Kamandulis Sigitas, Werasirirat Phurichaya, Namsawang Juntip, Singhasoot Nutsupa, Snieckus Audrius, Muanjai Pornpimol
Institute of Sport Science and Innovations, Lithuanian Sports University, Kaunas, Lithuania.
Exercise and Nutrition Innovation and Sciences Research Unit, Burapha University, Chonburi, Thailand.
J Hum Kinet. 2024 Jul 17;94:91-103. doi: 10.5114/jhk/187026. eCollection 2024 Oct.
This study investigated the changes in fascicle length (FL), musculotendinous unit (MTU) stiffness, muscle oxygen saturation (SmO), and muscular performance following a single bout of a combination of static stretching (SS) or dynamic stretching (DS) with foam rolling (FR), SS only, and eccentric exercise (ECC) only in young men with hamstring tightness. Twenty-five men (20.5 ± 1.5 years) participated in a crossover randomized study of the four conditions (DS+FR, SS+FR, SS, and ECC); each session was spaced seven days apart. FL, MTU stiffness during the straight leg raise (SLR), hamstring SmO, and isometric and eccentric torque were measured before, immediately and 30 min after exercise. Immediately after exercise, the SLR increased significantly by means of 7.4% (d = 1.07), 6% (d = 1.27), 6% (d = 1.10), and 8% (d = 1.04, all p < 0.001) for DS+FR, SS+FR, ECC, and SS, respectively. FL was longer after exercise under all four conditions (p < 0.05). MTU stiffness decreased after ECC (p = 0.038, d = 0.40). SmO tended to decrease for ECC (p > 0.05), but it was increased immediately after those three exercises. Hamstring isometric torque was significantly reduced by an average of 6-9%, but eccentric torque changes varied among conditions. In conclusion, substantial and similar immediate increases in hamstring flexibility, coupled with reduced isometric torque following various exercises, were accompanied by condition-specific alterations in fascicle length, MTU stiffness, or SmO. These findings provide practical insights for acutely enhancing range of motion in individuals with tight hamstrings.
本研究调查了在腘绳肌紧张的年轻男性中，单次进行静态拉伸（SS）或动态拉伸（DS）与泡沫轴放松（FR）组合、仅进行SS以及仅进行离心运动（ECC）后，肌束长度（FL）、肌肉肌腱单元（MTU）刚度、肌肉氧饱和度（SmO）和肌肉性能的变化。25名男性（20.5±1.5岁）参与了这四种情况（DS+FR、SS+FR、SS和ECC）的交叉随机研究；每个阶段间隔7天。在运动前、运动后即刻和30分钟时，测量了FL、直腿抬高（SLR）过程中的MTU刚度、腘绳肌SmO以及等长和离心扭矩。运动后即刻，DS+FR、SS+FR、ECC和SS的SLR分别显著增加了7.4%（d=1.07）、6%（d=1.27）、6%（d=1.10）和8%（d=1.04，均p<0.001）。在所有四种情况下，运动后的FL都更长（p<0.05）。ECC后MTU刚度降低（p=0.038，d=0.40）。ECC时SmO有下降趋势（p>0.05），但在这三种运动后即刻增加。腘绳肌等长扭矩平均显著降低了6-9%，但离心扭矩变化因情况而异。总之，各种运动后腘绳肌柔韧性立即显著且相似地增加，同时等长扭矩降低，同时伴有肌束长度、MTU刚度或SmO的特定情况变化。这些发现为急性增加腘绳肌紧张个体的活动范围提供了实用见解。
