The fit matters: Influence of accelerometer fitting and training drill demands on load measures in rugby league players

Journal article

McLean, Blake D., Cummins, Cloe, Conlan, Greta, Duthie, Grant and Coutts, Aaron J.. (2018). The fit matters: Influence of accelerometer fitting and training drill demands on load measures in rugby league players. International Journal of Sports Physiology and Performance. 13(8), pp. 1083 - 1089. https://doi.org/10.1123/ijspp.2017-0729
AuthorsMcLean, Blake D., Cummins, Cloe, Conlan, Greta, Duthie, Grant and Coutts, Aaron J.
Abstract

Purpose: To determine the relationship between drill type and accelerometer-derived loads during various team-sport activities and examine the influence of unit fitting on these loads. Methods: Sixteen rugby league players were fitted with microtechnology devices in either manufacturer vests or playing jerseys before completing standardized running, agility, and tackling drills. Two-dimensional (2D) and 3-dimensional (3D) accelerometer loads (BodyLoad™) per kilometer were compared across drills and fittings (ie, vest and jersey). Results: When fitted in a vest, 2D BodyLoad was higher during tackling (21.5 [14.8] AU/km) than during running (9.5 [2.5] AU/km) and agility (10.3 [2.7] AU/km). Jersey fitting resulted in more than 2-fold higher BodyLoad during running (2D = 9.5 [2.7] vs 29.3 [14.8] AU/km, 3D = 48.5 [14.8] vs 111.5 [45.4] AU/km) and agility (2D = 10.3 [2.7] vs 21.0 [8.1] AU/km, 3D = 40.4 [13.6] vs 77.7 [26.8] AU/km) compared with a vest fitting. Jersey fitting also produced higher BodyLoad during tackling drills (2D = 21.5 [14.8] vs 27.8 [18.6] AU/km, 3D = 42.0 [21.4] vs 63.2 [33.1] AU/km). Conclusions: This study provides evidence supporting the construct validity of 2D BodyLoad for assessing collision/tackling load in rugby league training drills. Conversely, the large values obtained from 3D BodyLoad (which includes the vertical load vector) appear to mask small increases in load during tackling drills, rendering 3D BodyLoad insensitive to changes in contact load. Unit fitting has a large influence on accumulated accelerometer loads during all drills, which is likely related to greater incidental unit movement when units are fitted in jerseys. Therefore, it is recommended that athletes wear microtechnology units in manufacturer-provided vests to provide valid and reliable information.

Keywordsexternal load; team sport; monitoring; inertial measurement
Year2018
JournalInternational Journal of Sports Physiology and Performance
Journal citation13 (8), pp. 1083 - 1089
PublisherHuman Kinetics, Inc.
ISSN1555-0265
Digital Object Identifier (DOI)https://doi.org/10.1123/ijspp.2017-0729
Scopus EID2-s2.0-85054558727
Open accessPublished as green open access
Page range1083 - 1089
Research GroupSports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre
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Accepted author manuscript version reprinted, by permission, from International Journal of Sports Physiology and Performance, 2018, 13 (8), pp. 1083 - 1089, https://www.doi.org/10.1123/ijspp.2017-0729 © Human Kinetics, Inc.

Place of publicationUnited States of America
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Delaney, Jace A., Thornton, Heidi R., Scott, Tannath J., Ballard, David A., Duthie, Grant, Wood, Lisa G. and Dascombe, Ben. (2016). Validity of skinfold-based measures for tracking changes in body composition in professional rugby league players. International Journal of Sports Physiology and Performance. 11(2), pp. 261 - 266. https://doi.org/10.1123/ijspp.2015-0244
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Delaney, Jace A., Scott, Tannath J., Ballard, David A., Duthie, Grant M., Hickmans, Jeremy A., Lockie, Robert G. and Dascombe, Ben J.. (2015). Contributing factors to change-of-direction ability in professional rugby league players. Journal of Strength and Conditioning Research. 29(10), pp. 2688 - 2696. https://doi.org/10.1519/JSC.0000000000000960
Contributing factors to change-of-direction ability in professional Rugby League players
Delaney, Jace A., Scott, Tannath J., Ballard, David A., Duthie, Grant M., Hickmans, Jeremy A., Lockie, Robert G. and Dascombe, Ben J.. (2015). Contributing factors to change-of-direction ability in professional Rugby League players. Journal of Strength and Conditioning Research. 29(10), pp. 2688 - 2696. https://doi.org/10.1519/JSC.0000000000000960
Establishing duration-specific running intensities from match-play analysis in rugby league
Delaney, Jace A., Scott, Tannath J., Thornton, Heidi R., Bennett, Kyle J. M., Gay, David, Duthie, Grant M. and Dascombe, Ben J.. (2015). Establishing duration-specific running intensities from match-play analysis in rugby league. International Journal of Sports Physiology and Performance. 10(6), pp. 725 - 731. https://doi.org/10.1123/ijspp.2015-0092
Comparison of anthropometry, upper body strength and lower body power characteristics in different levels of Australian Football players
Bilsborough, Johann, Greenway, Kate, Opar, David, Livingstone, Steuart, Cordy, Justin, Bird, S. and Coutts, Aaron. (2015). Comparison of anthropometry, upper body strength and lower body power characteristics in different levels of Australian Football players. Journal of Strength and Conditioning Research. 29(3), pp. 826 - 834. https://doi.org/10.1519/JSC.0000000000000682
Reliability and Usefulness of the 30-15 Intermittent Fitness Test in Rugby League
Scott, Tannath J., Delaney, Jace A., Duthie, Grant M., Sanctuary, Colin E., Ballard, David A., Hickmans, Jeremy A. and Dascombe, Ben J.. (2015). Reliability and Usefulness of the 30-15 Intermittent Fitness Test in Rugby League. Journal of Strength and Conditioning Research. 29(7), pp. 1985 - 1990. https://doi.org/10.1519/JSC.0000000000000846
Establishing duration-specific running intensities from match-play analysis in rugby league
Delaney, Jace A., Scott, Tannath J., Thornton, Heidi R., Bennett, Kyle J. M., Gay, David, Duthie, Grant M. and Dascombe, Ben J.. (2015). Establishing duration-specific running intensities from match-play analysis in rugby league. International Journal of Sports Physiology and Performance. 10(6), pp. 725 - 731. https://doi.org/10.1123/ijspp.2015-0092
Reliability and usefulness of the 30-15 intermittent fitness test in Rugby League
Scott, Tannath J., Delaney, Jace A., Duthie, Grant M., Sanctuary, Colin E., Ballard, David A., Hickmans, Jeremy A. and Dascombe, Ben J.. (2015). Reliability and usefulness of the 30-15 intermittent fitness test in Rugby League. Journal of Strength and Conditioning Research. 29(7), pp. 1985 - 1990. https://doi.org/10.1519/JSC.0000000000000846
The accuracy and precision of DXA for assessing body composition in team sport athletes
Bilsborough, Johann, Greenway, Kate, Opar, David, Livingstone, Steuart, Cordy, Justin and Coutts, Aaron. (2014). The accuracy and precision of DXA for assessing body composition in team sport athletes. Journal of Sports Sciences. 32(19), pp. 1821 - 1828. https://doi.org/10.1080/02640414.2014.926380
Do physical capacity and interchange rest periods influence match exercise-intensity profile in Australian football?
Mooney, Mitchell, Cormack, Stuart, O'Brien, Brendan and Coutts, Aaron. (2013). Do physical capacity and interchange rest periods influence match exercise-intensity profile in Australian football? International Journal of Sports Physiology and Performance. https://doi.org/10.1123/ijspp.8.2.165
International field hockey players perform more high-speed running than national-level conterparts
Jennings, Denise, Cormack, Stuart, Coutts, Aaron and Aughey, Robert. (2012). International field hockey players perform more high-speed running than national-level conterparts. Journal of Strength and Conditioning Research. 26(4), pp. 947 - 952. https://doi.org/10.1519/JSC.0b013e31822e5913
Rugby league players
Gabbett, Tim and Duthie, Grant M.. (2012). Rugby league players. In In R. Tanner and C. Gore (Ed.). Physiological Tests for Elite Athletes pp. 371 - 378 Human Kinetics Publishers.
GPS Analysis of an International Field Hockey Tournament
Jennings, Denise, Cormack, Stuart, Coutts, Aaron and Aughey, Robert. (2012). GPS Analysis of an International Field Hockey Tournament. International Journal of Sports Physiology and Performance. 7(3), pp. 224 - 231. https://doi.org/10.1123/ijspp.7.3.224
The relationship between physical capacity and match performance in elite Australian football :A mediation approach
Mooney, Mitchell, O'Brien, Brendan, Cormack, Stuart, Coutts, Aaron, Berry, Jason and Young, Warren. (2011). The relationship between physical capacity and match performance in elite Australian football :A mediation approach. Journal of Science and Medicine in Sport. 14(5), pp. 447 - 452. https://doi.org/10.1016/j.jsams.2011.03.010
The Validity and Reliability of GPS Units for Measuring Distance in Team Sport Specific Running Patterns
Jennings, Denise, Cormack, Stuart, Coutts, Aaron, Boyd, Luke and Aughey, Robert. (2010). The Validity and Reliability of GPS Units for Measuring Distance in Team Sport Specific Running Patterns. International Journal of Sports Physiology and Performance. 5(3), pp. 328 - 341. https://doi.org/10.1123/ijspp.5.3.328
Variability of GPS units for measuring distance in team sport movements
Jennings, Denise, Cormack, Stuart, Coutts, Aaron, Boyd, Luke and Aughey, Robert. (2010). Variability of GPS units for measuring distance in team sport movements. International Journal of Sports Physiology and Performance. 5(4), pp. 565 - 569. https://doi.org/10.1123/ijspp.5.4.565
Neuromuscular, endocrine, and perceptual fatigue responses during different length between-match microcycles in professional rugby league players
McLean, Blake, Coutts, Aaron, Kelly, Vincent, McGuigan, Michael and Cormack, Stuart. (2010). Neuromuscular, endocrine, and perceptual fatigue responses during different length between-match microcycles in professional rugby league players. International Journal of Sports Physiology and Performance. 5(3), pp. 367 - 383. https://doi.org/10.1123/ijspp.5.3.367
Factors associated with the selection of freely chosen cadence in non-cyclists
Whitty, Anthony Gerard, Murphy, Aron J., Coutts, Aaron J. and Watsford, Mark L.. (2009). Factors associated with the selection of freely chosen cadence in non-cyclists. European Journal of Applied Physiology. 106(5), pp. 705 - 712. https://doi.org/10.1007/s00421-009-1071-0