Elsevier

Physical Therapy in Sport

Volume 45, September 2020, Pages 56-62
Physical Therapy in Sport

Original Research
Biomechanical quantification of deadbug bridging performance in competitive alpine skiers: Reliability, reference values, and associations with skiing performance and back overuse complaints

https://doi.org/10.1016/j.ptsp.2020.05.013Get rights and content
Under a Creative Commons license
open access

Highlights

  • Our approach to quantify athletes’ rear-chain stabilization capacity during DBB is objective, reliable, and relevant.

  • It could potentially be used for monitoring athletic long-term development and screening injury-relevant athletic deficits.

  • However, its predictive validity needs to be further investigated by longitudinal studies.

Abstract

Objectives

(1) To study the reliability of quantifying rear-chain stabilization capacity during deadbug bridging (DBB), (2) to provide reference values for competitive alpine skiers, and (3) to study associations with age, anthropometrics, maturation, skiing performance and back overuse complaints.

Design

Cross-sectional.

Setting

Biomechanical field experiment including questionnaires.

Participants

12 healthy subjects (reliability experiment); 133 skiers of the U16 category and 38 of the elite category (main experiment).

Main outcome measures

DBB performance was quantified using 3D motion capture as the maximum amplitude of the relative vertical displacement of two pelvis markers (DBBdisplacement). Additionally, in U16 skiers, age, anthropometrics, maturation, skiing performance, and back overuse complaints were assessed.

Results

The reliability experiment revealed an ICC(3,1) and 95% CI of 0.81 [0.61, 0.93]. Within-subject SEM was 3.89 mm [3.16 mm, 5.12 mm]. Depending on sex and category, medians of DBBdisplacement in skiers ranged between 29 mm and 45 mm. DBBdisplacement differed between elite and U16 skiers (p < 0.001), but not between sexes. In U16 skiers, DBBdisplacement was independent of age, anthropometrics, and biological maturation, however, associated with skiing performance and back overuse complaints (p < 0.05).

Conclusion

The proposed approach may be considered an adequate method to quantify athletes’ rear-chain stabilization capacity.

Keywords

Stabilization
Athletes
Biological maturity
Performance
Injury

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