Bruijn, J. de (2016) The Influence of Substitution Duration on Physical Output during International Field Hockey Matches: Is Longer Better? thesis, Sport Sciences.
Full text available on request.Abstract
Research has shown that physical output may decrease during competitive matches in intermittent sports. In elite field hockey, players perform at a very high intensity during blocks of play that are interspersed with bouts of rest like breaks and substitutions. The main purpose of this study was therefore to determine the effect of the duration of a recovery bout on players’ subsequent physical output. Seventeen elite field hockey players (Age: 25.6 ± 2.76; Body Mass: 79.5 ± 5.26; Fat %: 11.1 ± 2.13; VO2max: 59.6 ± 5.06) belonging to a world-class national hockey team participated in this study. Heart rate and GPS data were collected during four matches against the same international opponent. All data points were arranged to include a preceding playing block, a period of rest and a following playing block. Physical output was quantified using four parameters: distance per minute, percentage of high-speed running, TRIMPMOD per minute and efficiency index. Influence of substitution duration, player position, preceding load and total preceding playing time were modelled using multilevel analysis. On average, players played 65.4% of a match and substitutions lasted 4.5 minutes. Substitution duration was found to be a significant predictor of distance per minute and player efficiency (p<0.05). Physical output of attackers improved most with increasing substitution times. No relationship was found between total preceding playing time and physical output. To conclude, the results suggest that players produce a better physical performance after increasing substitution durations. This indicates that substitutions of sufficient length can be used to enable players to maintain physical output. It is therefore recommended for coaches to carefully consider the duration of substitutions in designing their substitution strategy.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | Brink, dr. M.S. and Doeven, S.H. |
| Faculty: | Medical Sciences |
| Date Deposited: | 20 Apr 2022 10:11 |
| Last Modified: | 20 Apr 2022 10:11 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3125 |
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