生物谐振规律对步行效率影响的前驱研究

关键词：生物谐振  步态分析  氧价  小儿麻痹后遗症

Keywords:bio-resonance  gait analysis  oxygen cost  poliomyelitis sequela

摘要：

      目的：通过下肢软瘫模型研究生物谐振对步行效率的影响。方法：下肢软瘫并导致步行障碍的男性小儿麻痹后遗症患者12名(17±1岁，身高1.68±4.6m，体重52.5±5.4kg)与同龄健康青年12名匹配对照。采用三维步态分析系统获取步态参数，采用便携式气体分析系统测定氧价，作为能量效率的指标。评测状态为自然步行、80%自然步频以及120%自然步频，即100%、80%、120%自然步频。结果：儿麻患者在100%、80%、120%自然步频的条件下步速分别为（65.45±8.71、53.04±5.92、74.47±9.49）m/s，步速和步频密切相关（r=0.96, P<0.01）；耗氧量分别为（15.17±3.56、20.76±4.31、21.48±6.16）ml/min/kg， 慢速与快速步频的耗氧量均显著高于自然步频 (P<0.01)；氧价分别为（0.231±0.043、0.294±0.061、0.288±0.072）ml/m/kg，和同龄正常人比较自然、慢速与快速步频下的氧价均明显增加（P<0.01）。慢速与快速步频的氧价亦显著高于自然步频 (P<0.05)。结论：儿麻患者自然步频的能量效率最高，步频加速或者减慢均降低此效率，提示肌肉固有谐振规律的作用。

Abstract:

      Objective: To explore the internal walking bio-resonance essence in the patient with poliomyelitis sequela so as to discover ideal walking state of lowest energy expenditure. Method：Twelve young male students with poliomyelitis sequela were involved in this study (age 17.25±1ys, height 1.68±4.6m and weight 52.5±5.4kg). Another 12 healthy students were matched as control. The time-space parameters were collected with Motion Analysis System and oxygen cost was obtained with a Cosmed K4b2 portable gas analysis system. The self-selected, comfortable walking frequency was recorded through three dimensional gait analysis system. The participants walked according to 80% and 120% comfortable walking frequency. Result: The comfortable walking frequency in poliomyelitis was 101.3±8.5 steps/min. Low speed and high speed walking frequency were 80.42±8.5 steps s/min and 121.1±10.0steps/min (P<0.001). The walking speed (m/min) was 65.45±8.71, 53.04±5.92 and 74.47±9.49(P<0.01). The comparison of oxygen consumption in three conditions were significantly different (P<0.01), and the oxygen cost was lowest(0.231±0.043ml/m/kg) in natual walking frequency (P<0.05). Meanwhile, the oxygen cost of patients with poilomyelitis were higher than normal subjects(P<0.01). Conclusion: The ideal walking state in the patients with poliomyelitis sequela is in a natual, self-selected, comfortable walking rhythm and energy consumption and oxygen cost are lowest. The change of walking rhythm may result in increase of energy expenditure and decrease of work efficiency.