Human-in-the-loop optimization (HILO) has maximized the benefits of using wearable robots. Although all previous HILO studies have shown promising results, the majority have been validated in laboratory settings. The factor restricting HILO from real-world applications is its optimization time. Therefore, this study focused on developing a swift HILO strategy targeting its outdoor applications. We validate the proposed HILO strategy in two phases during incline walking with a portable hip extension exosuit. The first phase was conducted on an instrumented treadmill, followed by an outdoor case study in community settings. During the first phase, the optimization converged in 7 min reducing the metabolic energy by 10.5 ± 1.3% compared to walking without assistance. After redesigning the HILO based on indoor results, we achieved a 16.2% metabolic reduction in 3 min 24 s of optimization while walking outdoors, making it the fastest HILO strategy to date.




  Funding Information
*  Institute of Civil m Military Technology Cooperation funded by the Defense Acquisition Program Administration and Ministry of Trade,Industry
    and Energy of Korean government (Grant/Award Numbers: 9991008623 23-SF-RO-10)
*  Korea Medical Device Development Fund grant funded bythe Korea government (the Ministry of Science and ICT, the Ministry of Trade, Industry
    and Energy, the Ministry of Health & Welfare, the Ministry of Food and Drug Safety), (Grant/Award Numbers: 1711174527 RS-2022-00140621)
*  Korea Health Technology R&D Project through the Korea Health IndustryDevelopment Institute (KHIDI), funded by the Ministry of Health & Welfare,
    Republic of Korea, (Grant/Award Number: RS-2023-KH141196)
*  IndustrialStrategic Technology Development Program funded by the Ministry of Trade, Industry, & Energy (MOTIE, Korea),
  (Grant/Award Number: 20007058)