Evidence map›Paper›PMID 34693813›Full record

ArticleSports health

External Training Load and the Association With Back Pain in Competitive Adolescent Tennis Players: Results From the SMASH Cohort Study.

Fredrik Johansson, Tim Gabbett, Per Svedmark, Eva Skillgate

Abstract read
In one paragraph

Article in Sports health. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

17 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
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  3. Article
  4. Article
  5. Racket Sports-Related Injuries in Youth Athletes: A Narrative Review.International journal of environmental research and public health · 2026
    Review
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  7. Article
  8. Review
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  10. Article
  11. Shoulder Torque Production and Muscular Balance after Long and Short Tennis Points.International journal of environmental research and public health · 2022
    Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Fredrik JohanssonTennis Research and Performance Group, MUSIC, Department of Health Promotion Sciences, Sophiahemmet University, Stockholm, Sweden.
Tim GabbettGabbett Performance Solutions, Brisbane, Clayfield, Queensland, Australia.
Per SvedmarkCenter for Spine Surgery, Stockholm, Stockholm, Sweden.
Eva SkillgateTennis Research and Performance Group, MUSIC, Department of Health Promotion Sciences, Sophiahemmet University, Stockholm, Sweden.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundIn young tennis players, high loads on the spine and high training volumes in relation to age are associated with a high lifetime prevalence of back pain. The primary aim of this study was to investigate if accumulated external workload "spikes" in the acute:chronic workload ratio (ACWR) of tennis training, match play, and fitness training, and if high or low workload/age ratio were associated with back pain events in competitive adolescent tennis players. Additional aims were to report the incidence of back pain stratified by sex and level of play and to describe the characteristics of players with back pain. HYPOTHESIS: Rapid increases in external workload are associated with the incidence of back pain. STUDY

designCohort study of 198 competitive tennis players, 13 to 19 years, with a weekly follow-up for 52 consecutive weeks. LEVEL OF EVIDENCE: Level 3.

methodsAccumulated external workload spikes (uncoupled ACWR >1.3), and the workload/age ratio, were time-varying exposures in Cox regression analyses with the outcome back pain (pain intensity ≥2/10 in the lower back and/or in the upper back/neck with a pain-related disability).

resultsFor each additional workload spike in tennis training/match play, the hazard rate ratio (HRR) was 1.17 (95% CI, 1.06-1.28) for back pain. The corresponding HRR for fitness training was 1.13 (95% CI, 1.05-1.22). Training workload/age ratio was not related to back pain.

conclusionAccumulated external workload spikes of tennis training, match play, and/or fitness training are associated with a higher rate of back pain events in competitive adolescent tennis players. CLINICAL RELEVANCE: Back pain is a troublesome clinical problem that may affect the performance of talented young tennis players. Structuring the training schedule to minimize rapid increases (ie, spikes) of training load on a weekly basis may enhance performance and reduce back pain in adolescent tennis players.

Indexed as

TennisAdolescentBack PainCohort StudiesHumansIncidenceProspective Studiesacute:chronic workload ratio (ACWR)adolescentback paincohort studyinjurytennisworkload

Identifiers

PMID34693813
PMCPMC8655482

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.