Maltais Désirée, Wilk Boguslaw, Unnithan Viswanath, Bar-Or Oded
Children's Exercise and Nutrition Centre, Department of Pediatrics, McMaster University, Hamilton, Canada.
Med Sci Sports Exerc. 2004 Oct;36(10):1674-81. doi: 10.1249/01.mss.0000142312.43629.d8.
When metabolic rate during arm-cranking in the heat is equated between children and adolescents with cerebral palsy (CP) and matched controls (CON), there are no relevant intergroup differences in heat strain. The metabolic rate, however, is known to be higher in CP during treadmill walking. The purpose of this study was to determine if during treadmill walking in the heat, the higher oxygen uptake (VO2), and thus greater metabolic heat production in those with CP would result in greater heat strain compared with able-bodied, matched CON.
Ten boys and girls (10.3-16.3 yr) with spastic CP and 10 individually matched (age, body size, biological maturity, gender, race) healthy CON performed 3 x 10-min treadmill walking bouts in 35 degrees C, 50% RH. Body mass, metabolic variables, heart rate (HR), body temperatures, and rating of perceived exertion (RPE) were periodically measured. Individuals within each CP-CON pair walked at the same speed and slope (0.9 +/- 0.4 m x s(-1), 3.3 +/- 0.6%).
Steady-state VO2 during walking, body temperatures, and HR were all higher in the CP group compared with CON. VO2 was on average 40% higher, rectal temperature was 0.4 degrees C (99% CI = 0.1-0.6 degrees C) higher and HR (during the final minute of each exercise bout) was 37 beats x min(-1) (99% CI = 19-56 beats x min(-1)) higher. There were no differences between the groups in sweating rate (as inferred from body mass changes corrected for fluid intake and output) or in RPE.
The subjects with CP demonstrated greater thermal strain than CON during treadmill walking where they require more metabolic energy and thus produce more metabolic heat than CON.
当脑瘫（CP）儿童和青少年与匹配的对照组（CON）在热环境中进行手摇曲柄运动时的代谢率相等时，热应激方面不存在相关的组间差异。然而，已知CP患者在跑步机行走时代谢率更高。本研究的目的是确定在热环境中进行跑步机行走时，CP患者较高的摄氧量（VO2），进而更高的代谢产热，与健全的匹配对照组相比，是否会导致更大的热应激。
10名患有痉挛性CP的男孩和女孩（10.3 - 16.3岁）以及10名个体匹配（年龄、体型、生物成熟度、性别、种族）的健康CON在35摄氏度、50%相对湿度下进行3次10分钟的跑步机行走试验。定期测量体重、代谢变量、心率（HR）、体温和主观用力程度分级（RPE）。每个CP - CON配对中的个体以相同的速度和坡度行走（0.9 +/- 0.4米×秒⁻¹，3.3 +/- 0.6%）。
与CON相比，CP组在行走过程中的稳态VO2、体温和HR均更高。VO2平均高40%，直肠温度高0.4摄氏度（99%置信区间 = 0.1 - 0.6摄氏度），HR（在每次运动试验的最后一分钟）高37次/分钟（99%置信区间 = 19 - 56次/分钟）。两组在出汗率（根据液体摄入和排出校正后的体重变化推断）或RPE方面没有差异。
在跑步机行走过程中，CP患者比CON表现出更大的热应激，因为他们比CON需要更多的代谢能量，从而产生更多的代谢热。
