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首页> 外文期刊>Clinical journal of sport medicine: official journal of the Canadian Academy of Sport Medicine >Induced anterior knee pain immediately reduces involuntary and voluntary quadriceps activation
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Induced anterior knee pain immediately reduces involuntary and voluntary quadriceps activation

机译：诱发前膝痛可立即减少非自愿和自愿的股四头肌激活

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OBJECTIVE:: To examine the immediate effects of experimentally induced anterior knee pain (AKP) on involuntary and voluntary quadriceps strength and activation. DESIGN:: Crossover 3 × 3 randomized controlled laboratory study with repeated measures. SETTING:: Human Performance Research Center, Brigham Young University. PARTICIPANTS:: Thirteen neurologically sound volunteers (age, 21.9 ± 3.2 years). INTERVENTIONS:: Subjects underwent 3 different conditions (pain, sham, and control). To induce AKP and sham condition, 5% sodium chloride and 0.9% sodium chloride (total volume of 1.0 mL for each condition), respectively, were injected into the infrapatellar fat pad on the dominant leg. No injection was performed for the control condition. MAIN OUTCOME MEASURES:: The vastus medialis peak Hoffmann reflex normalized by the peak motor response (H:M ratio) was used to measure involuntary quadriceps activation. Quadriceps central activation ratio (CAR) using maximal isometric knee extension torque (N·m) was calculated to assess voluntary quadriceps activation. The visual analog scale was used to measure pain perception. RESULTS:: Our pain model increased perceived pain immediately after the 5% hypertonic saline injection and pain lasted for 12 minutes on average (F40,743 = 16.85, P < 0.001). During the pain condition, subjects showed a 12% decrease in H:M ratio (F2,59 = 8.64, P < 0.001), a 34% decrease in maximal isometric knee extension torque (F2,59 = 5.89, P < 0.01), and a 5% decrease in CAR (F2,59 = 3.83, P = 0.03). CONCLUSIONS:: Our data showed that joint pain may be an independent factor to alter function of the muscles surrounding the painful joint. Both involuntary and voluntary inhibitory pathways may play a role in an immediate reduction of muscle activation.
机译：目的：研究实验性前膝关节疼痛（AKP）对非自愿和自愿性股四头肌力量和激活的即时影响。设计：：采用重复措施的交叉3×3随机对照实验室研究。地点：杨百翰大学人类绩效研究中心。参与者：13位神经系统健全的志愿者（年龄，21.9±3.2岁）。干预：：受试者经历了3种不同的条件（疼痛，假手术和控制）。为了诱发AKP和假手术，分别将5％的氯化钠和0.9％的氯化钠（每种情况下的总体积为1.0 mL）注入占优势腿的leg下脂肪垫中。对于对照条件不进行注射。主要观察指标：以运动反应峰值（H：M比）归一化的股内侧腓肠肌霍夫曼反射峰用于测量非自愿性股四头肌激活。使用最大等距膝盖伸展扭矩（N·m）计算股四头肌中央激活率（CAR），以评估自愿性股四头肌激活。视觉模拟量表用于测量疼痛感。结果：我们的疼痛模型在注射5％高渗盐水后立即增加了感知到的疼痛，并且疼痛平均持续了12分钟（F40,743 = 16.85，P <0.001）。在疼痛状态下，受试者的H：M比降低了12％（F2,59 = 8.64，P <0.001），最大等距膝盖伸展扭矩降低了34％（F2,59 = 5.89，P <0.01），且CAR降低了5％（F2,59 = 3.83，P = 0.03）。结论：我们的数据表明，关节痛可能是改变疼痛关节周围肌肉功能的独立因素。非自愿和自愿抑制途径均可在立即减少肌肉活化中起作用。

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