School of Allied Health Sciences, Griffith University, Australia; Griffith Sports Physiology and Performance, Griffith University, Australia; Gold Coast Orthopaedic Research and Education Alliance (GCORE), Menzies Health Institute Queensland, Gold Coast, Queensland, Australia.
School of Allied Health Sciences, Griffith University, Australia.
J Sci Med Sport. 2019 Jul;22(7):769-774. doi: 10.1016/j.jsams.2019.01.010. Epub 2019 Jan 26.
To investigate whether five-weeks of concentric (CON) or eccentric (ECC) hamstring strength training have different effects on recovery from sprint running, eccentric strength and architecture of the biceps femoris long head (BF).
Cohort study.
Thirty males (age, 22.8±4.1y; height, 180.1±6.4cm; weight, 85.2±14.6kg) were allocated into either a CON or ECC group, both performing nine sessions of resistance training. Prior to and immediately after the five-week intervention, each participant's BF fascicle length (FL), pennation angle (PA), muscle thickness (MT), peak isometric KF torque and Nordic eccentric strength were assessed. Post-intervention, participants performed two timed sprint sessions (10×80m) 48h apart. Blood samples and passive KF torques were collected before, immediately after, 24h and 48h after the first sprint session.
After five-weeks of strength-training, fascicles lengthened in the ECC (p<0.001; d=2.0) and shortened in the CON group (p<0.001; d=0.92), while PA decreased for the ECC (p=0.001; d=0.52) and increased in the CON group (p<0.001; d=1.69). Nordic eccentric strength improved in both ECC (p<0.001; d=1.49) and CON (p<0.001; d=0.95) groups. No between-group differences were observed in peak isometric strength (p=0.480), passive KF torques (p=0.807), sprint performance decrements between sprint sessions (p=0.317) and creatine kinase (p=0.818).
Despite inducing significant differences in BF muscle architecture, there were no significant between group differences in sprint performance decrements across two sprint sessions.
探究五周的向心(concentric，CON)或离心(eccentric，ECC)腘绳肌力量训练对短跑后恢复、离心力量和股二头肌长头(biceps femoris long head，BF)结构有何不同影响。
队列研究。
30 名男性(年龄 22.8±4.1 岁；身高 180.1±6.4cm；体重 85.2±14.6kg)被分配到 CON 或 ECC 组，均进行 9 次抗阻训练。在五周干预前后，分别评估每位参与者的 BF 肌束长度(fascicle length，FL)、肌节角度(pennation angle，PA)、肌厚(muscle thickness，MT)、峰值等长膝关节伸肌扭矩和北欧式离心力量。干预后，参与者在 48 小时内进行两次计时短跑测试(10×80m)。第一次短跑测试前后、24 小时和 48 小时后采集血液样本和被动膝关节伸肌扭矩。
五周力量训练后，ECC 组肌束变长(p<0.001；d=2.0)，CON 组肌束变短(p<0.001；d=0.92)，ECC 组 PA 减小(p=0.001；d=0.52)，CON 组 PA 增大(p<0.001；d=1.69)。ECC(d=1.49)和 CON(d=0.95)组的北欧式离心力量均有改善。两组间峰值等长膝关节伸肌力量(p=0.480)、被动膝关节伸肌扭矩(p=0.807)、两次短跑测试间的短跑成绩下降(p=0.317)和肌酸激酶(p=0.818)无差异。
尽管 BF 肌肉结构有显著差异，但在两次短跑测试之间，短跑成绩下降无显著组间差异。
