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Sports Medicine

, Volume 48, Issue 8, pp 1929–1961 | Cite as

The Relationship Between Training Load and Injury in Athletes: A Systematic Review

  • Timothy G. Eckard
  • Darin A. Padua
  • Darren W. Hearn
  • Brett S. Pexa
  • Barnett S. Frank
Systematic Review

Abstract

Background

The relationship between training load and musculoskeletal injury is a rapidly advancing area of research in need of an updated systematic review.

Objective

This systematic review examined the evidence for the relationship between training load and musculoskeletal injury risk in athlete, military, and first responder (i.e. law enforcement, firefighting, rescue service) populations.

Methods

The CINAHL, EMBASE, MEDLINE, SportDISCUS, and SCOPUS databases were searched using a comprehensive strategy. Studies published prior to July 2017 were included if they prospectively examined the relationship between training load and injury risk. Study quality was assessed using the Newcastle–Ottawa Quality Assessment Scale (NOS) and Oxford Centre for Evidence-Based Medicine levels of evidence. A narrative synthesis of findings was conducted.

Results

A total of 2047 articles were examined for potential inclusion. Forty-six met the inclusion criteria and 11 known to the authors but not found in the search were added, for a total of 57 articles. Overall, 47 studies had at least partially statistically significant results, demonstrating a relationship between training load and injury risk. Included articles were rated as poor (n = 15), fair (n = 6), and good (n = 36) based on NOS score. Articles assessed as ‘good’ were considered level 2b evidence on the Oxford Centre for Evidence-Based Medicine Model, and articles assessed as ‘fair’ or ‘poor’ were considered level 4 evidence.

Conclusions

Our results demonstrate that the existence of a relationship between training load and injury continues to be well supported in the literature and is strongest for subjective internal training load. The directionality of this relationship appears to depend on the type and timeframe of load measured.

Notes

Acknowledgements

The authors would like to acknowledge and thank Ms. Rachael Posey and Ms. Chana Kraus Friedberg for their help in developing and executing the search strategy.

Compliance with Ethical Standards

Funding

Timothy Eckard is supported by a Promotional of Doctoral Studies scholarship from the (US) Foundation for Physical Therapy. No other sources of funding were used to assist in the preparation of this article.

Conflicts of Interest

Timothy Eckard, Darin Padua, Darren Hearn and Barnett Frank declare that they have no conflicts of interest relevant to the content of this review.

Supplementary material

40279_2018_951_MOESM1_ESM.docx (44 kb)
Supplementary material 1 (DOCX 43 kb)
40279_2018_951_MOESM2_ESM.pdf (96 kb)
Supplementary material 2 (PDF 96 kb)
40279_2018_951_MOESM3_ESM.docx (22 kb)
Supplementary material 3 (DOCX 22 kb)
40279_2018_951_MOESM4_ESM.docx (55 kb)
Supplementary material 4 (DOCX 54 kb)
40279_2018_951_MOESM5_ESM.xlsx (43 kb)
Supplementary material 5 (XLSX 43 kb)

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Exercise and Sport ScienceUniversity of North Carolina at Chapel HillChapel HillUSA

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