PlayerLoad variables : Sensitive to changes in direction and not related to collision workloads in rugby league match play

Journal article


Hulin, Billy T., Gabbett, Tim J., Johnston, Rich D. and Jenkins, David G.. (2018). PlayerLoad variables : Sensitive to changes in direction and not related to collision workloads in rugby league match play. International Journal of Sports Physiology and Performance. 13(9), pp. 1136-1142. https://doi.org/10.1123/ijspp.2017-0557
AuthorsHulin, Billy T., Gabbett, Tim J., Johnston, Rich D. and Jenkins, David G.
Abstract

Purpose: To determine (1) how change-of-direction (COD) workloads influence PlayerLoad (PL) variables when controlling total distance covered and (2) relationships among collision workloads and PL variables during rugby league match play. Methods: Participants completed 3 protocols (crossover design) consisting of 10 repetitions of a 60-m effort in 15 s. The difference between protocols was the COD demands required to complete 1 repetition: no COD (straight line), 1° × 180° COD, or 3° × 180° COD. During rugby league matches, relationships among collision workloads, triaxial vector-magnitude PlayerLoad (PLVM), anteroposterior + mediolateral PL (PL2D), and PLVM accumulated at locomotor velocities below 2 m·s−1 (ie, PLSLOW) were examined using Pearson correlations (r) with coefficients of determination (R2). Results: Comparing 3° × 180° COD to straight-line drills, PLVM·min−1 (d = 1.50 ± 0.49, large, likelihood = 100%, almost certainly), PL2D·min−1 (d = 1.38 ± 0.53, large, likelihood = 100%, almost certainly), and PLSLOW·min−1 (d = 1.69 ± 0.40, large, likelihood = 100%, almost certainly) were greater. Collisions per minute demonstrated a distinct (ie, R2 < .50) relationship from PLVM·min−1 (R2 = .30, r = .55) and PL2D·min−1 (R2 = .37, r = .61). Total distance per minute demonstrated a very large relationship with PLVM·min−1 (R2 = .62, r = .79) and PL2D·min−1 (R2 = .57, r = .76). Conclusions: PL variables demonstrate (1) large increases as COD demands intensify, (2) separate relationships from collision workloads, and (3) moderate to very large relationships with total distance during match play. PL variables should be used with caution to measure collision workloads in team sport.

Keywordstraining load; monitoring; sport medicine
Year2018
JournalInternational Journal of Sports Physiology and Performance
Journal citation13 (9), pp. 1136-1142
PublisherHuman Kinetics, Inc.
ISSN1555-0273
Digital Object Identifier (DOI)https://doi.org/10.1123/ijspp.2017-0557
Scopus EID2-s2.0-85056279505
Open accessPublished as green open access
Page range1136-1142
Research GroupSports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre
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Open
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Output statusPublished
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Online2018
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