Danaher Patrick, Tanaka Kunihiko, Hargens Alan R
University of California, San Diego, Department of Orthopedic Surgery, San Diego, CA 92103-8894, USA.
Aviat Space Environ Med. 2005 Apr;76(4):381-4.
An elastic mechanical counter pressure (MCP) glove for spacesuits is under development. In this study we compared handgrip and pinch grip strength levels for the MCP glove and the current extravehicular mobility unit (EMU) gas-pressurized glove.
We employed handgrip and pinch grip dynamometers to assess strength levels and von Frey monofilaments to evaluate hand sensitivity. Tests were conducted with the gloved hand inserted in an evacuation chamber at 200 mmHg below atmospheric pressure to simulate conditions in space.
Average bare hand strength was 463 N and decreased to 240 N for EMU and 250 N for MCP. Pinch grip and key grip testing showed no difference among conditions. However, there was a significant decrease in palmar grip strength from 111 N barehanded to 67 N in both gloves. Barehanded endurance time was 160 s and dropped to 63 and 69 s for EMU and MCP, respectively. Sensitivity was significantly better for MCP compared with the EMU.
The MCP glove improved hand sensitivity when compared with the EMU glove and performed as well as the EMU glove in terms of overall handgrip strength, endurance at 25% of maximum handgrip strength, pinch grip, palmar grip, and key grip tests. Improvements in fabric composition and glove design may further improve ergonomic and other functional parameters of the MCP glove.
一种用于太空服的弹性机械反压（MCP）手套正在研发中。在本研究中，我们比较了MCP手套和当前舱外活动装置（EMU）气加压手套的握力和捏力强度水平。
我们使用握力计和捏力计来评估强度水平，并用冯·弗雷单丝来评估手部敏感度。测试时将戴手套的手插入一个低于大气压200 mmHg的真空室中，以模拟太空环境。
裸手平均力量为463 N，EMU手套条件下降至240 N，MCP手套条件下降至250 N。捏力和钥匙抓握测试在不同条件下未显示出差异。然而，两种手套的手掌握力均从裸手时的111 N显著降至67 N。裸手耐力时间为160 s，EMU手套和MCP手套分别降至63 s和69 s。与EMU手套相比，MCP手套的敏感度明显更高。
与EMU手套相比，MCP手套提高了手部敏感度，并且在整体握力强度、最大握力强度25%时的耐力、捏力、手掌握力和钥匙抓握测试方面表现与EMU手套相当。织物成分和手套设计的改进可能会进一步改善MCP手套的人体工程学和其他功能参数。
