Authors
Mimi Guo, Muhamad Hafiz Bin Ismail, Diyana Zulaika Binti Abdul Ghani, Qi Liang, Yifei Gao
Published in
Journal of applied biomechanics. Pages 1-8. Aug 21, 2026. Epub Aug 21, 2026.
Abstract
The rumba turning sequence is technically demanding, but the repeatability of continuous kinematic waveforms during repeated performance remains unclear. This study examined trial-to-trial repeatability and curve-level reliability of rotational-progress-aligned kinematic waveforms during the primary 360° rotation in a standardized rumba turning sequence, corresponding to the initial spiral turn. Fifteen high-level adolescent female Latin dancers completed 5 valid trials at 76 beats per minute. Kinematic data were collected using a 10-camera Vicon 3-dimensional motion capture system (100 Hz). Support-foot progression angle, pelvic obliquity, and thorax-pelvis relative frontal-plane angle were analyzed across 101 rotational-progress points. Whole-waveform similarity, point-by-point SD, integrated intraclass correlation coefficient(A,1), integrated standard error of measurement, and key-event reliability were calculated. All variables showed high whole-waveform similarity (r = .932-.944). Integrated intraclass correlation coefficient(A,1) ranged from .545 to .675. Integrated standard error of measurement was smallest for pelvic obliquity (3.98°) and largest for support-foot progression angle (10.55°). Variability hotspots occurred in specific rotational-progress regions, and magnitude-related key events generally showed smaller absolute error than timing-related events. These findings indicate that continuous kinematic variables differ in reliability and measurement error and should be selected cautiously for repeated technical assessment.
PMID:
42632627
Bibliographic data and abstract were imported from PubMed on 23 Aug 2026.
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