有腰痛病史者重复进行腰椎伸展运动后的股四头肌抑制
Quadriceps inhibition after repetitive lumbar extension exercise in persons with a history of low back pain.
作者信息
Hart Joseph M, Fritz Julie M, Kerrigan D Casey, Saliba Ethan N, Gansneder Bruce M, Ingersoll Christopher D
机构信息
University of Virginia, Department of Orthopaedic Surgery,Charlottesville, VA, USA.
出版信息
J Athl Train. 2006 Jul-Sep;41(3):264-9.
CONTEXT
A neuromuscular relationship exists between the lumbar extensor and quadriceps muscles during fatiguing exercise. However, this relationship may be different for persons with low back pain (LBP).
OBJECTIVE
To compare quadriceps inhibition after isometric, fatiguing lumbar extension exercise between persons with a history of LBP and control subjects.
DESIGN
A 2 x 3 factorial, repeated-measures, time-series design with independent variables of group (persons with a history of LBP, controls) and time (baseline, postexercise set 1, postexercise set 2).
SETTING
University research laboratory.
PATIENTS OR OTHER PARTICIPANTS
Twenty-five subjects with a history of LBP were matched by sex, height, and mass to 25 healthy control subjects.
INTERVENTION(S): Electromyography median frequency indexed lumbar paraspinal muscular fatigue while subjects performed 2 sets of isometric lumbar extension exercise. Subjects exercised until a 15% downward shift in median frequency for the first set and a 25% shift for the second set were demonstrated.
MAIN OUTCOME MEASURE(S): Knee extension force was measured while subjects performed an isometric maximal quadriceps contraction. During this maximal effort, a percutaneous electric stimulus was applied to the quadriceps, causing a transient, supramaximal increase in force output. We used the ratio between the 2 forces to estimate quadriceps inhibition. Quadriceps electromyographic activity was recorded during the maximal contractions to compare median frequencies over time.
RESULTS
Both groups exhibited significantly increased quadriceps inhibition after the first (12.6% +/- 10.0%, P < .001) and second (15.2% +/- 9.7%, P < .001) exercise sets compared with baseline (9.6% +/- 9.3%). However, quadriceps inhibition was not different between groups.
CONCLUSIONS
Persons with a history of LBP do not appear to be any more or less vulnerable to quadriceps inhibition after fatiguing lumbar extension exercise.
背景
在疲劳运动期间，腰椎伸肌和股四头肌之间存在神经肌肉关系。然而，对于患有腰痛（LBP）的人来说，这种关系可能有所不同。
目的
比较有腰痛病史的人与对照组在进行等长、疲劳性腰椎伸展运动后股四头肌的抑制情况。
设计
采用2×3析因、重复测量、时间序列设计，自变量为组别（有腰痛病史的人、对照组）和时间（基线、运动后第1组、运动后第2组）。
地点
大学研究实验室。
患者或其他参与者
25名有腰痛病史的受试者与25名健康对照受试者按性别、身高和体重进行匹配。
干预措施
在受试者进行2组等长腰椎伸展运动时，通过肌电图中位频率指标来评估腰椎旁肌肉疲劳情况。受试者持续运动，直至第一组中位频率下降15%，第二组下降25%。
主要观察指标
在受试者进行等长最大股四头肌收缩时测量膝关节伸展力。在最大用力过程中，对股四头肌施加经皮电刺激，使力输出产生短暂的、超最大幅度的增加。我们用这两种力的比值来估计股四头肌的抑制情况。在最大收缩过程中记录股四头肌的肌电活动，以比较不同时间的中位频率。
结果
与基线时（9.6%±9.3%）相比，两组在运动后第1组（12.6%±10.0%，P<.001）和第2组（15.2%±9.7%，P<.001）后股四头肌抑制均显著增加。然而，两组之间的股四头肌抑制情况没有差异。
结论
有腰痛病史的人在进行疲劳性腰椎伸展运动后，股四头肌抑制的易感性似乎并无差异。
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