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1- Human Movement Science Department, Nelson Mandela University, Port Elizabeth, South Africa
2- Human Movement Science Department, Nelson Mandela University, Port Elizabeth, South Africa ,
3- Physical Activity, Sport and Recreation (PhaSRec) Research Focus Area, North West University, Potchefstroom, South Africa
Abstract:   (479 Views)
Background. Reactive abilities of goalkeepers are crucial and may have direct impacts on match results. Research on factors that may enhance goalkeeper performances during diving tasks (DT), and how these factors are mediated would therefore provide valuable information for coaches and goalkeepers. Objectives. The purpose of this investigation was to: (i) assess the impact of caffeine consumption and post-activation performance enhancement (PAPE) on DT ability of goalkeepers and (ii) investigate the potential mechanisms responsible for changes in DT performance. Methods. Purposive sampling was utilised, coupled with a double-blinded cross-over study design. A total of 25 soccer goalkeepers volunteered for the study (age: 22.50 ± 4.32 years; height: 1.67 ± 0.78 m; mass: 66.58 ± 11.30 kg). Players were evaluated for simple reaction time (SRT), dynamic reaction time (RT), jump height (JH), and reactive DT under three treatment conditions: control, caffeine, and PAPE. Results. Improvements in DT are mediated by improvements in RT rather than changes in JH (i.e. explosiveness) when consuming caffeine (β = -0.09, t (48) = -3.17, P =0.002) or performing plyometric drills (β = -0.14, t (48) = -4.47, P <0.001). Both treatments were similarly effective (Mdiff = 0.00 sec, P < 0.994). Conclusion. Caffeine consumption or PAPE are similarly effective in improving goalkeeper DT performances. These improvements may likely be related to changes in dynamic RT thereby implying that faster information processing by the CNS is the likely source for improvements.
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Goalkeeper reactive diving performances (DT) are enhanced by similar mechanisms when ingesting caffeine or completing a PAPE drill. The ergogenic improvements are likely to be transferred to on-field performances on the basis that DT was enhanced within practically meaningful ranges.

Type of Study: Original Article | Subject: Sport Physiology and its related branches
Received: 2021/02/17 | Accepted: 2021/01/12

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