Study on the Propulsion Efficiency of Working Ro-Scull based on the Energy Expenditure

The Japanese boat “Wasen” uses “Ro-Scull” as a human-powered propulsionsystem. These traditional boats and propulsionsystem are almost vanished in Japan due to decrease in material Wood, and boat-builder’s aging. “Ro-Scull” is thought to be effective propulsivemethod compared to other human-poweredboat such as canoe and cutter boat. In this study, the authors evaluate propulsive efficiencyof “Ro-Scull” based on active metabolic rate (MR). The authors measured MR and metabolic equivalents(Mets) during “Ro-Scull”, walking, and joggingexercise by using indirect calorimeter. MR and Mets during “Ro-Scull” exercise were nearly equal to walking ones. Energy conversion efficiencyof “Ro-scull” was 12.3%. These suggest that propulsion efficiencyof “Ro-Scull” is efficient, and its exercise can be done for a prolonged time as well as walking. “Ro-Scull” exercise seems to be useful way to become familiar with maritime activities and seamanship.