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Paper Abstract and Keywords
Presentation 2026-01-23 14:50
Development and Evaluation of a Four-Limb External Force Estimation System for Bouldering Climbing
Hyuuga Ishisaki, Daigo Takakuwa, Nao Ito (Toyama KOSEN) CAS2025-79 ICTSSL2025-57
Abstract (in Japanese) (See Japanese page) 
(in English) Bouldering route grades are often determined subjectively, which can lead to inconsistencies between the assigned grade and the actual difficulty of the route. Such inconsistencies may hinder skill development and increase the risk of injury. To address this issue, we have proposed a four-limb external force estimation system using a motion capture tool and a physics engine, aiming to support objective grade estimation based on climbing motion. In this study, the accuracy of the proposed system was evaluated using a jumping motion as a fundamental experiment. The vertical external force estimated by the proposed method was compared with the ground reaction force measured by a single-axis force plate. Sampling-rate differences were adjusted using linear interpolation, and the estimation accuracy was quantitatively evaluated using the root mean square error (RMSE), correlation coefficient, and coefficient of determination. The results showed that, although the error in estimating the absolute magnitude of external forces was large, a certain level of correlation was observed in the temporal variation trends. These findings indicate that, while the proposed system is not suitable for precise force measurement, it has potential as a feature extraction method for representing motion characteristics in bouldering grade estimation.
Keyword (in Japanese) (See Japanese page) 
(in English) Bouldering / External Force Estimation / Motion Analysis / Motion Capture / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 321, CAS2025-79, pp. 127-130, Jan. 2026.
Paper # CAS2025-79 
Date of Issue 2026-01-15 (CAS, ICTSSL) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF CAS2025-79 ICTSSL2025-57

Conference Information
Committee ICTSSL CAS  
Conference Date 2026-01-22 - 2026-01-23 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CAS 
Conference Code 2026-01-ICTSSL-CAS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Development and Evaluation of a Four-Limb External Force Estimation System for Bouldering Climbing 
Sub Title (in English)  
Keyword(1) Bouldering  
Keyword(2) External Force Estimation  
Keyword(3) Motion Analysis  
Keyword(4) Motion Capture  
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1st Author's Name Hyuuga Ishisaki  
1st Author's Affiliation National Institute of Technology, Toyama College (Toyama KOSEN)
2nd Author's Name Daigo Takakuwa  
2nd Author's Affiliation National Institute of Technology, Toyama College (Toyama KOSEN)
3rd Author's Name Nao Ito  
3rd Author's Affiliation National Institute of Technology, Toyama College (Toyama KOSEN)
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Speaker Author-1 
Date Time 2026-01-23 14:50:00 
Presentation Time 15 minutes 
Registration for CAS 
Paper # CAS2025-79, ICTSSL2025-57 
Volume (vol) vol.125 
Number (no) no.321(CAS), no.322(ICTSSL) 
Page pp.127-130 
#Pages 4 
Date of Issue 2026-01-15 (CAS, ICTSSL) 

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