http://www.canberra.edu.au/researchrepository/items/04454bad-cbdb-461a-bf25-6784c5fd65cd/1/
Copyright:
©2016 National Strength & Conditioning Association
Version:This is the non-final version of an article that was accepted for publication in the Journal of Strength and Conditioning Research, which has been published at http://doi.org/10.1519/JSC.0000000000001188 . Changes resulting from the publishing process may not be reflected in this document.
ABSTRACTThis study determined whether body composition, strength and power changes that occur during pre-season can be maintained during an international rugby sevens season. Fourteen male international rugby sevens players (age 21.4 ± 2.2 y; mean ± SD) were categorized as a forward (n=7) or back (n=7), and assessed for height, mass (M), skinfolds (S) (∑7), upper body (UB) strength, lower body (LB) strength and LB power. Bench press, back squat and a countermovement jump were used to measure strength and power at three time points: initial, early season and late season. Forwards were taller (185 ± 4cm), heavier (95 ± 6kg) and possessed a greater lean body mass (55.5 ± 4.0 M·S -0.14 ) than backs (181 ± 8cm, 88.5 ± 5.5kg, 51.9 ± 3.4 M S -0.14 ). Over the full season, small (~5% ± 5%; mean ± 90% confidence limits) positive changes occurred in body composition. LB strength gained during the pre-season decayed in-season, whereas UB strength increased moderately (~10% ± 3%) across the season. Power showed inconsistencies between measured variables with a moderate positive change across the season in mean velocity and relative peak power. Forwards showed a small decrease in peak power (relative and absolute). Moderate changes were observed in mean power over the season, forwards decreasing (~6% ± 6%) and backs increasing (~8% ± 6%). Rugby sevens forwards in this study found it difficult to maintain and improve power qualities in-season.Training loads of forwards and backs should be differentiated to maximize strength and power inseason.
KEY WORDSPre-season, in-season, back squat, bench press, countermovement jump