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Experimental study on the effectiveness of the PCM cooling vest in persons with paraplegia of varying levels
Journal of Thermal Biology ( IF 2.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jtherbio.2020.102634
Farah Mneimneh 1 , Charbel Moussalem 2 , Nesreen Ghaddar 1 , Kamel Ghali 1 , Ibrahim Omeis 2
Affiliation  

Persons with paraplegia (PA) from thoracic spinal cord injury (T1-T12) are prone to thermal stress during exercise due to impaired thermoregulation. This study evaluates the effectiveness of phase change material (PCM) cooling vests on persons with PA of different levels of injury during exercise in hot exposure. Sixteen participants were recruited and divided to three groups based on injury level; high-thoracic T1-T3, mid-thoracic T4-T8, and low thoracic T9-T12 to perform a 30-min arm-crank exercise at a 30 °C room condition. Two types of PCM vests at melting temperature of 20 °C were tested: i) V1 with PCM covering the trunk of 3.4 kg overall vest mass and ii) V2 with PCM covering chest and upper back of 2.17 kg overall vest mass. High thoracic and low-thoracic groups performed NV and V1 tests; whereas, mid-thoracic group performed NV, V1, and V2 tests. Heart rate, core, and skin temperatures were monitored during 15-min preconditioning, 30-min exercise, and 15-min recovery. In addition, thermal comfort, sensation, skin wettedness, and perceived exertion were recorded during exercise only. The main findings were that the effectiveness of the cooling vest was dependent on injury level and portion of sensate skin of trunk covered by the PCM packets. Rise in core temperature (ΔTcr) was reduced significantly for the low-thoracic group during exercise and recovery (ΔTcr=0.41°C, 0.26°C for NV and V1; respectively, p<0.05). For the mid-thoracic group, both V1 (p = 0.001) and V2 (p = 0.008) were effective in reducing ΔTcr compared to the NV test at the end of the recovery period (0.74°C,0.42°C,0.56°C, for NV, V1 and V2; respectively). For the high-thoracic group, V1 was not effective in reducing core temperature (p>0.05). For the mid-thoracic group, V2 at 36% lower mass significantly improved thermal comfort (p = 0.0004) compared to the NV test and was as effective compared to V1 in reducing core temperature.

中文翻译:

PCM降温背心对不同程度截瘫患者效果的实验研究

由于体温调节受损,胸脊髓损伤 (T1-T12) 导致截瘫 (PA) 的人在运动过程中容易受到热应激。本研究评估了相变材料 (PCM) 冷却背心对热暴露运动期间不同程度损伤的 PA 患者的有效性。招募了 16 名参与者,并根据受伤程度分为三组;高胸椎 T1-T3、中胸椎 T4-T8 和低胸椎 T9-T12 在 30 °C 的室内条件下进行 30 分钟的臂曲柄运动。测试了熔化温度为 20°C 的两种类型的 PCM 背心:i) V1,PCM 覆盖了 3.4 kg 总背心质量的躯干和 ii) V2,PCM 覆盖了胸部和上背部,总背心质量为 2.17 kg。高胸组和低胸组进行NV和V1测试;而中胸组进行 NV、V1、和 V2 测试。在 15 分钟预处理、30 分钟运动和 15 分钟恢复期间监测心率、核心和皮肤温度。此外,仅在运动期间记录热舒适度、感觉、皮肤湿润度和感知用力。主要发现是冷却背心的有效性取决于受伤程度和被 PCM 包覆盖的躯干感觉皮肤部分。在运动和恢复期间,低胸组的核心温度 (ΔTcr) 升高显着降低(ΔTcr=0.41°C,NV 和 V1 分别为 0.26°C;p<0.05)。对于中胸组,与恢复期结束时的 NV 测试(0.74°C、0.42°C、0.56°C)相比,V1(p = 0.001)和 V2(p = 0.008)均能有效降低 ΔTcr ,分别为 NV、V1 和 V2;)。对于高胸组,V1 不能有效降低核心温度(p>0.05)。对于中胸组,与 NV 测试相比,V2 质量降低 36% 显着提高了热舒适性(p = 0.0004),并且与 V1 相比在降低核心温度方面同样有效。
更新日期:2020-07-01
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