Affiliation:
1. State Key Laboratory of Tribology, Department of Mechanical Engineering Tsinghua University Beijing China
2. Peimonte Ski Instructor College Turin Italy
Abstract
AbstractPurposePara‐alpine sit skiers face unique challenges in balance control due to their disabilities and the use of sit skis. This study assessed their multi‐joint coordination before and after slackline training.MethodsNine alpine sit skiers (6 M/3 F; 27 ± 8 years; height: 168.3 ± 6.0 cm; body mass: 55.4 ± 6.9 kg) with different disabilities (LW10‐LW12) volunteered for the experiment. All subjects performed slackline training for 5 weeks (20 sessions). Joint kinematics were captured by vision‐based markerless motion analysis. Root mean square (RMS) amplitude, mean velocity and mean power frequency (MPF) were evaluated.ResultsAfter training, performance improved significantly with an increase in balance time (1041%, p = 0.002), and a decrease in joint angular velocities and RMS amplitude of the sit ski foot (p < 0.05). Joint synergies were developed through in‐ or anti‐phase movements between joint pairs, particularly involving the hip joints (continuous relative phase angles ~0° or 180°, p < 0.001). Multi‐joint coordination shifted from large‐RMS amplitude of elbows to low‐MPF large‐RMS amplitude of the hip and shoulders (p < 0.05), with a significant increase of hip weighting (77.61%, p = 0.031) in the principal component analysis. The coordination was maintained with the change of slackline tension (p < 0.05). Athletes with severe trunk disabilities (LW10) had shorter balance time and poorer coordination than athletes with full trunk functions (LW12).ConclusionsOur findings showed the development of joint coordination involving better control of the hip and sit skis during the challenging slackline training task.
Funder
National Natural Science Foundation of China
Subject
Physical Therapy, Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献