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CC BY-NC-ND 4.0 · Sports Med Int Open 2018; 02(06): E185-E190
DOI: 10.1055/a-0770-4699
Training & Testing
Eigentümer und Copyright ©Georg Thieme Verlag KG 2018

Unilateral Conditioning Contractions Enhance Power Output in Elite Short Track Speed Skaters

Philippe Gimenez
1   Laboratoire C3S (EA 4660), Université de Bourgogne-Franche-Comté, Besançon, France
2   École de kinésiologie et des sciences de l'activité physique, Université de Montréal, Montréal, Canada
,
Evelyne Chicoine
2   École de kinésiologie et des sciences de l'activité physique, Université de Montréal, Montréal, Canada
,
David Amarantini
3   ToNIC, Toulouse NeuroImaging Center, Université de Toulouse, Inserm, UPS, France
,
Fabien Dal Maso
4   École de kinésiologie et des sciences de l'activité physique, laboratoire de simulation et modélisation du mouvement, Université de Montréal, Montréal, Canada
,
Jonathan Tremblay
2   École de kinésiologie et des sciences de l'activité physique, Université de Montréal, Montréal, Canada
5   Institut National du Sport du Québec, Montréal, Canada
› Author Affiliations
Further Information

Publication History

received  18 January 2018
revised  16 October 2018

accepted  19 October 2018

Publication Date:
15 November 2018 (online)

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Abstract

The objective of the present study was to assess the effect of unilateral lower-body-conditioning muscle contractions during multiple sets of fatiguing repeated jumps in elite athletes. Five elite short-track speed-skating athletes performed 9 sets of 6 maximal consecutive jumps on 2 separate occasions: with (COND) and without (CTRL) preliminary voluntary conditioning contractions (CC) 5 min before the beginning of the sets. The CC consisted of 2 consecutive 3 s maximal unilateral isometric squats against a fixed bar, resulting in a 6 s overall isometric contraction per leg. For each set, power output (PO) was measured using a linear position transducer and averaged over the 6 corresponding repeated jumps. The results showed that PO was significantly greater during the test in COND than in CTRL (p<0.01). PO significantly decreased with sets, by 19.4±4.7  and 15.2±7.6% (p<0.001) between the first and last set in COND and CTRL, respectively. A 2×3 s maximal unilateral isometric CC, performed 5 min before unloaded repeated jumps, significantly increased mean PO. These results suggest that unilateral conditioning contractions can enhance performance in subsequent bilateral repeated jumps.

Key words

exercise - post activation potentiation - fatigue - power
 

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