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Does Maximal Strength or Speed-Strength Have Stronger Associations with Performance Indicators in the Rugby Football

Lachlan P James1, Vincent G Kelly2, Jonathon Weakley3,4,5

  • 1Sport, Performance, and Nutrition Research Group, Department of Dietetics, Nutrition and Sport, School of Allied Health, Human Services, and Sport, La Trobe University, Melbourne, VIC, Australia. l.james@latrobe.edu.au.

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Summary
This summary is machine-generated.

Maximal strength, not speed-strength, is more strongly linked to key performance indicators in rugby. This finding helps guide resistance training for rugby union and rugby league players.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Maximal strength and speed-strength are distinct physical qualities crucial for rugby union and rugby league.
  • Understanding their association with game performance aids resistance training program design.

Purpose of the Study:

  • To systematically review and meta-analyze the literature comparing maximal strength and speed-strength associations with in-game KPIs in rugby.
  • To explore if KPI type moderates the strength-speed association.

Main Methods:

  • Systematic literature search (PRISMA guidelines) of Web of Science, PubMed, and SportDiscus up to December 2024.
  • Meta-analysis of correlation coefficients converted to Fisher's z-transformed effect sizes.
  • Multivariate meta-analysis framework with subgroup analysis for KPI type.

Main Results:

  • Six studies with 41 comparisons and 134 players were included.
  • Overall pooled effect favored maximal strength (0.24 [0.11: 0.37]).
  • KPI type was a significant moderator (p=0.038), with maximal strength showing stronger associations.

Conclusions:

  • Within-game KPIs in rugby typically show stronger links to maximal strength than to speed-strength.
  • The advantage of maximal strength may not universally apply to all KPIs or future contexts due to significant variability.