Kevin L. de Keijzer

ORCID: 0000-0003-1113-164X
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Research Areas
  • Sports injuries and prevention
  • Sports Performance and Training
  • Sport Psychology and Performance
  • Cardiovascular and exercise physiology
  • Musculoskeletal pain and rehabilitation
  • Injury Epidemiology and Prevention
  • Shoulder Injury and Treatment
  • Occupational Health and Performance
  • Sports Dynamics and Biomechanics
  • Muscle activation and electromyography studies
  • Cardiovascular Effects of Exercise

University of Suffolk
2019-2025

Abstract Background Flywheel resistance training has become more integrated within programs in a variety of sports due to the neuromuscular, strength, and task-specific enhancements reported with this training. Objective This paper aimed present consensus reached by internationally recognized experts during meeting on current definitions guidelines for implementation flywheel technology sports. Methods Nineteen from different countries took part process; 16 them were at (18 May 2023) while...

10.1007/s40279-023-01979-x article EN cc-by Sports Medicine 2024-01-04

The aim of this study was to evaluate the post-activation potentiation (PAP) effects following eccentric overload (EOL) and traditional weightlifting (TW) exercise on standing long jump (SLJ), countermovement (CMJ), 5 m sprint acceleration performance. Ten male athletes were involved in a randomized, crossover study. subjects performed 3 sets 6 repetitions EOL or TW half squat followed by SLJ, CMJ, tests at 1 min, min 7 separate sessions using randomized order. Bayes factor (BF10) reported...

10.1371/journal.pone.0222466 article EN cc-by PLoS ONE 2019-09-12

This study investigated the effects of a weekly flywheel resistance training session over 10-week period on U16 soccer players' physical performance with special attention to change direction ability (e.g., deficit [CODdef]). Twenty elite young players were assigned an experimental (EG, n = 10) or control (CG, group. Unilateral countermovement jumps dominant (CMJd) and non-dominant (CMJnd) leg, 10, 20, 30-m linear sprint test in 5 + (COD10) 10 m (COD20) performed before after period....

10.1080/15438627.2020.1870978 article EN Research in Sports Medicine 2021-01-05

Abstract Beato, M, De Keijzer, KL, Leskauskas, Z, Allen, WJ, Dello Iacono, A, and McErlain-Naylor, SA. Effect of postactivation potentiation after medium vs. high inertia eccentric overload exercise on standing long jump, countermovement change direction performance. J Strength Cond Res 35(9): 2616–2621, 2021—This study aimed to evaluate the (PAP) effects an (EOL) vertical horizontal jumps (COD) Twelve healthy physically active male subjects were involved in a crossover study. The performed...

10.1519/jsc.0000000000003214 article EN The Journal of Strength and Conditioning Research 2019-06-22

The aim of this study was to assess the sensitivity accelerometer-derived metrics for monitoring fatigue during an intermittent exercise protocol. Fifteen university students were enrolled in (age 20 ± 1 years). A submaximal intermitted recovery test (Sub-IRT) with a duration 6 min and 30 s (drill 1) performed. In order increase participants' fatigue, after that, repeated sprint protocol (1×6 maximal m sprints) Following participants Sub-IRT 2) evaluate external internal training load (TL)...

10.3389/fphys.2019.00780 article EN cc-by Frontiers in Physiology 2019-06-26

Abstract Beato, M, Wren, C, and de Keijzer, KL. The interunit reliability of global navigation satellite systems Apex (STATSports) metrics during a standardized intermittent running activity. J Strength Cond Res 38(2): e49–e55, 2024—This study aimed to evaluate the (GNSS) STATSports assess which can be used by practitioners for monitoring short-distance activities. Fifty-four male soccer players were enrolled (age = 20.7 ± 1.9 years, body mass 73.2 9.5 kg, height 1.76 0.07 m) in this...

10.1519/jsc.0000000000004613 article EN The Journal of Strength and Conditioning Research 2023-10-06

This study aims to quantify and compare the external internal training load demands of sided-game drills in professional team players during competitive season. Twenty-four male soccer same club were enrolled this study. Drills categorized as large-sided games (LSG): 10vs10 (84 × 60 m or 72 m), Hexagon possession 9vs9 + 3 (36 48 Possession gate 8vs8 2 44 7vs7 (30 32 m) Small-sided (SSG): 6vs6 (48 42 6vs4 m). A total 7 279 individual data points included analysis. Distance covered, high-speed...

10.3389/fspor.2023.1150461 article EN cc-by Frontiers in Sports and Active Living 2023-04-04

Purpose : To investigate the postactivation potentiation (PAP) effects of different eccentric overload (EOL) exercise volumes on countermovement-jump (CMJ) and standing-long-jump (LJ) performance. Methods In total, 13 male university soccer players participated in a crossover design study following familiarization period. Control (no PAP) CMJ LJ performances were recorded, 3 experimental protocols performed randomized order: 1, 2, or sets 6 repetitions flywheel EOL half-squats (inertia =...

10.1123/ijspp.2019-0411 article EN International Journal of Sports Physiology and Performance 2020-02-28

The aim of this study was to evaluate the influence time-of-day on intrinsic modifiable hamstring injury risk factors in football (soccer) referees. Twenty-eigth semi-professional referees (28.6 ± 4.8 years) performed a neuromuscular test battery assess at three different time points during day (09:00 h, 14:00 and 19:00 h). tests included dynamic balance (Y-Balance), range joint motion (ROM) (straight leg raise test, ankle dorsiflexion, gluteus maximus test), muscle strength (isometric knee...

10.1080/07420528.2025.2490494 article EN Chronobiology International 2025-04-30

Physical tests and subjective measures, such as readiness wellness, aid in optimising training recovery, however, many tools lack proper validation, risking inaccurate conclusions. This study explores physical testing practices female football. A cross-sectional web-based survey was conducted among practitioners working with footballers. The survey, consisting of five sections 24 questions, examined three key areas: testing, readiness. total 51 from professional, semi-professional, academy...

10.1177/17479541251340283 article EN International Journal of Sports Science & Coaching 2025-05-21

The present study investigated the post-activation performance enhancement (PAPE) of isokinetic quadriceps and hamstrings torque after flywheel (FW)-squat vs. FW-deadlift in comparison to a control condition. Fifteen male athletes were enrolled this randomised, crossover study. Each protocol consisted 3 sets 6 repetitions, with an inertial load 0.029 kg.m2. Isokinetic (knee extension) flexion) concentric peak (60º/s) hamstring eccentric (-60º/s) measured 5 min experimental or conditions. A...

10.1080/14763141.2020.1810750 article EN Sports Biomechanics 2020-10-28

This study investigated the effect of flywheel moment inertia (0.029, 0.061, and 0.089 kg·m2) on concentric eccentric peak power eccentric:concentric ratio during unilateral leg curl hip extension exercises. Moreover, inter-session reliability was analyzed both Twenty amateur male soccer athletes attended five visits-performing three sets eight repetitions either or (all moments inertias) each visit. For curl, there were no differences in any measure between (p = 0.479) but a higher than for...

10.3389/fspor.2022.898649 article EN cc-by Frontiers in Sports and Active Living 2022-06-10

It remains unknown if flywheel-assisted squats can be reliably utilized to increase power outputs and such are related.To compare assisted unassisted flywheel squat peak outputs, determine their reliability, analyze the relationship of delta difference between during squats.Twenty male athletes attended laboratory 6 times-performing 3 sets 8 repetitions 2 familiarization sessions then experimental (2 for in randomized order, respectively).Concentric eccentric were significantly greater (both...

10.1123/ijspp.2022-0349 article EN International Journal of Sports Physiology and Performance 2023-03-02

Flywheel (isoinertial) resistance training is a valid strength method that has been incorporated in sport for decades, yet little known about how therapists working apply flywheel training. We aimed to describe and understand current application perception of amongst sport. Seventy- three (13 ± 10 years experience) started part this survey with 52 completing the entire electronic questionnaire. Nine multiple choice questions on perceptions (prerequisites, use technology, barriers, upper-...

10.3389/fspor.2023.1141431 article EN cc-by Frontiers in Sports and Active Living 2023-04-12

Citation: Perna P, de Keijzer KL and Beato M (2024) Flywheel resistance training in football: a useful rehabilitation tool for practitioners. Front. Sports Act. Living 6:1434995. doi: 10.3389/fspor.2024.1434995

10.3389/fspor.2024.1434995 article EN cc-by Frontiers in Sports and Active Living 2024-07-05

Purpose : This preregistered trial investigated how 6 weeks of unilateral flywheel leg-curl and hip-extension training impact isokinetic, isometric, strength power outcomes. Methods The study involved 11 male university athletes (age 22 [2] y; body mass 77.2 [11.3] kg; height 1.74 [0.09] m) with one leg randomly allocated to control. Unilateral eccentric isometric knee-flexion torque peak were tested. Training intensity volume (3–4 sets + 2 repetitions) progressively increased. Results...

10.1123/ijspp.2023-0035 article EN International Journal of Sports Physiology and Performance 2023-10-14
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