Bhambhani Y N, Holland L J, Steadward R D
Faculty of Rehabilitation Medicine, University of Alberta, Edmonton, Canada.
Arch Phys Med Rehabil. 1993 Mar;74(3):305-11.
This study examined the validity and reliability of the anaerobic threshold (AT) using blood lactate (ATLa) and respiratory gas exchange (ATg) criteria during cycle ergometry (CE) and wheelchair ergometry (WE) in athletes with spastic cerebral palsy (CP). Eleven subjects attempted a discontinuous incremental test protocol, two minutes work interspersed with one minute rest, twice each on the CE and WE. Only five out of the 11 subjects were able to complete the CE tests, whereas all the subjects were able to complete the WE test. Inadequate hip flexion due to muscle spasticity was the primary limiting factor during the CE tests. Although the maximal aerobic power using this protocol was reliable during WE (r = 0.89, p < .05), the validity and reliability of the AT identified by two independent evaluators using these two techniques was questionable. Evaluator 1 was able to identify ATLa and ATg in seven out of the 11 cases, whereas evaluator 2 was successful in five and seven cases, respectively. It is unclear from these results whether the poor validity and reliability of the AT was due to the discontinuous test protocol used, or whether it was due to inconsistencies in the rate of lactate diffusion from the muscle into the blood due to variations in muscle spasticity during the test.
本研究在痉挛型脑瘫（CP）运动员进行周期测力法（CE）和轮椅测力法（WE）期间，使用血乳酸（ATLa）和呼吸气体交换（ATg）标准检验了无氧阈（AT）的有效性和可靠性。11名受试者尝试了一种间断递增测试方案，即两分钟运动穿插一分钟休息，在CE和WE上各进行两次。11名受试者中只有5人能够完成CE测试，而所有受试者都能完成WE测试。CE测试期间，由于肌肉痉挛导致的髋关节屈曲不足是主要限制因素。尽管使用该方案测得的最大有氧功率在WE期间具有可靠性（r = 0.89，p < .05），但两名独立评估者使用这两种技术识别出的AT的有效性和可靠性存疑。评估者1在11例中有7例能够识别出ATLa和ATg，而评估者2分别在5例和7例中成功识别。从这些结果尚不清楚AT的有效性和可靠性差是由于所采用的间断测试方案，还是由于测试期间肌肉痉挛的变化导致乳酸从肌肉扩散到血液中的速率不一致。
