External cueing influences drop jump performance in trained young soccer players
Lippincott, Williams and Wilkins
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Drop jump (DJ) characteristics provide insight on power production and injury risk. The purpose of this study was to investigate the effect of external cueing on drop jump characteristics in young male soccer players. Fourteen academy soccer players performed DJs with four different conditions, control (CONT), contact cue (CC), height cue (HC), and quiet cue (QC). Performance measures were reactive strength index (RSI), jump height, ground contact time (GCT), and take-off impulse, with injury risk reflected by impact peak, impact timing and landing impulse. CC showed a very large significant reduction in GCT (ES > 2.0, p<0.05), and moderate to large increase in RSI, landing impulse, and push off impulse (ES 0.70-1.55, p<0.05) compared to all other conditions. CC also moderately increased impact peak when compared to HC and QC (ES ≥ 0.78, p<0.05). HC led to a significant increase in jump height that was moderately greater than other external cues (ES ≥ 0.87, p<0.05), but with only a small non-significant increase compared (ES 0.54, p >0.05) to CONT. The data showed that all cues provided a specific response; CC reduced GCT and increased RSI, HC increased jump height and QC reduced outcomes associated with injury risk. HC may be advantageous for young soccer players with a low training age as it shows a small to moderate increase in jump height without increasing injury risk. Young players may need to be safely progressed to be able to use a CC to facilitate high reactive strength without being exposed to undue injury risk.
Journal of Strength and Conditioning Research;
Oliver, J.L., Barillas, S.R.; Lloyd, R.S., Moore, I. and Pedley, J. (2019) ‘External cueing influences drop jump performance in trained young soccer players’, Journal of Strength and Conditioning Research.
Article published in Journal of Strength and Conditioning Research on 22 January 2019 (online), available at: https://doi.org/10.1519/JSC.0000000000002935. The author’s post-print will be made available in this repository from 22 January 2020.
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
- Sport Research Groups 
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