迷迭香对大强度耐力训练大鼠血清睾酮和肾上腺皮质激素的影响     

张婧  熊正英 《沈阳体育学院学报》2006,25(6):58-59,65

研究迷迭香对大强度耐力训练大鼠血清睾酮和肾上腺皮质激素的影响。方法:本实验选用SD大鼠,建立大强度耐力训练模型,训练结束测定其血清睾酮和肾上腺皮质激素。结果:大强度耐力训练可使大鼠血清睾酮下降,皮质醇水平上升,睾酮/皮质醇(T/C)值下降,说明大强度耐力训练已造成大鼠机体神经内分泌系统机能紊乱,使大鼠体内的分解代谢持续加强。服用迷迭香后大鼠血清睾酮水平均明显高于其相应的对照组,T/C值明显升高;服用迷迭香的大强度耐力训练组大鼠血清皮质醇水平明显下降。结论:服用迷迭香可以促进大强度耐力训练后大鼠合成代谢加强,有利于能量物质的储存,促进运动性疲劳的恢复。  相似文献   

Quadriceps effort during squat exercise depends on hip extensor muscle strategy     

Megan A. Bryanton  Jason P. Carey  Michael D. Kennedy 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1):122-138

Hip extensor strategy, specifically relative contribution of gluteus maximus versus hamstrings, will influence quadriceps effort required during squat exercise, as hamstrings and quadriceps co-contract at the knee. This research examined the effects of hip extensor strategy on quadriceps relative muscular effort (RME) during barbell squat. Inverse dynamics-based torque-driven musculoskeletal models were developed to account for hamstrings co-contraction. Net joint moments were calculated using 3D motion analysis and force platform data. Hamstrings co-contraction was modelled under two assumptions: (1) equivalent gluteus maximus and hamstrings activation (Model 1) and (2) preferential gluteus maximus activation (Model 2). Quadriceps RME, the ratio of quadriceps moment to maximum knee extensor strength, was determined using inverse dynamics only, Model 1 and Model 2. Quadriceps RME was greater in both Models 1 and 2 than inverse dynamics only at barbell loads of 50–90% one repetition maximum. The highest quadriceps RMEs were 120 ± 36% and 87 ± 28% in Models 1 and 2, respectively, which suggests that barbell squats are only feasible using the Model 2 strategy prioritising gluteus maximus versus hamstrings activation. These results indicate that developing strength in both gluteus maximus and quadriceps is essential for lifting heavy loads in squat exercise.  相似文献