Alomari M A, Welsch M A, Prisby R D, Lee C M, Wood R H
Louisiana State University, Baton Rouge, USA.
Int J Sports Med. 2001 Jul;22(5):361-5. doi: 10.1055/s-2001-15654.
This study examined the effect of low (25% of maximum voluntary contraction) and high (75% of maximum voluntary contraction) intensity short-term handgrip exercise training on localized vascular function. Forearm blood flow was evaluated in twenty-eight healthy men (age: 23 +/- 4.3) pre- and post-training in both forearms at rest, following forearm occlusion and following forearm occlusion combined with handgrip exercise using strain gauge plethysmography. The 4-week program consisted of non-dominant handgrip exercise performed 5 d/wk for 20 min at either low or high intensity. Following training a significant increase in forearm blood flow was noted for the nondominant arm in both groups after forearm occlusion (low intensity group: 16.51%; high intensity group: 20.72%; p = 0.001) and forearm occlusion combined with handgrip exercise (low intensity group: 17.71%; high intensity group: 29.27%; p = 0.001). No significant group by test interaction (p = 0.632) was found. These data show improved unilateral vasodilatory responsiveness after short-term handgrip training. In addition, the degree of change is most notable following the greatest vasodilatory stimulus. Lastly, a lack of group by treatment interaction suggests the change may be independent of training stimulus.
本研究考察了低强度（最大自主收缩的25%）和高强度（最大自主收缩的75%）短期握力训练对局部血管功能的影响。在28名健康男性（年龄：23±4.3岁）中，使用应变片体积描记法，在训练前后分别于静息状态、前臂阻断后以及前臂阻断联合握力运动后，对双侧前臂的血流情况进行评估。为期4周的训练计划包括每周5天、每次20分钟的非优势手的握力训练，训练强度分为低强度或高强度。训练后，两组非优势手臂在前臂阻断后（低强度组：16.51%；高强度组：20.72%；p = 0.001）以及前臂阻断联合握力运动后（低强度组：17.71%；高强度组：29.27%；p = 0.001），前臂血流均显著增加。未发现组间与测试的交互作用显著（p = 0.632）。这些数据表明，短期握力训练后单侧血管舒张反应性得到改善。此外，在最大血管舒张刺激后，变化程度最为显著。最后，缺乏组间与治疗的交互作用表明，这种变化可能与训练刺激无关。
