Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2020) 19, 213 - 223

Research article
Isoinertial Eccentric-Overload Training in Young Soccer Players: Effects on Strength, Sprint, Change of Direction, Agility and Soccer Shooting Precision
Giovanni Fiorilli1, Intrieri Mariano1, Enzo Iuliano3, Arrigo Giombini2, Antonello Ciccarelli2, Andrea Buonsenso1, Giuseppe Calcagno1, Alessandra di Cagno2, 
Author Information
1 Department of Medicine and Health Sciences, University of Molise, Campobasso, Italy
2 Department of Movement, Human and Health Sciences, Italian University of Sport and Movement of Rome “Foro Italico”, Rome, Italy
3 Faculty of Psychology, eCampus University, Novedrate, Italy

Alessandra di Cagno
✉ University of Sport and Movement of Rome “Foro Italico”, 00197 Rome, Italy
Publish Date
Received: 22-01-2019
Accepted: 21-12-2019
Published (online): 24-02-2020
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The isoinertial training method owes its efficacy to an accommodated resistance and optimal individualized eccentric overload. The aim of this study was to assess the effects of a 6-week isoinertial eccentric-overload training program - using a flywheel inertial device during the execution of specific soccer exercises - on explosive and reactive strength, sprint ability, change of direction (COD) performance and soccer shooting precision. Thirty-four junior soccer players were randomly assigned to a plyometric training group (PT) (n = 16, aged 13.36 ± 0.80), which underwent a six-week traditional soccer training program, and a flywheel eccentric overload group (FEO) (n = 18, aged 13.21 ± 1.21), which received additional training consisting of two inertial eccentric-overload training sessions per week. Pre and post intervention tests were carried out to assess explosive and reactive strength, sprint ability, COD ability, agility using the Y-agility test (YT) and soccer shooting precision. The FEO showed significantly higher values than the PT in squat jump height (SJh) (p = 0.01), drop jump height (DJh) (p = 0.003), 7 repeated hop test heights (p = 0.001), the Illinois test (ILL) (p = 0.001), and the Loughborough Soccer Shooting Test (SHOT) (p = 0.02). Finally, the FEO showed significant between-group differences in DJh (p = 0.007), ILL (p = 0.0002), YT (p = 0.002), a linear sprint test (SPRINT) (p = 0.001), and SHOT (p = 0.003). These results confirmed the positive effect of isoinertial training. The use of an isoinertial device to overload multidirectional movements in specific sport conditions leads to greater performance improvements than conventional soccer training. The absence of knowledge of the eccentric overload applied by the isoinertial device, which is different in any exercise repetition, may stimulate the athlete’s neural adaptations, improving their soccer skills and in particular their soccer shooting precision.

Key words: Gravity-independent flywheel device, multidirectional speed, unknown overload, eccentric strength training

           Key Points
  • The iso-inertial eccentric training evoked greater improvements than traditional soccer training.
  • The soccer shooting precision, significantly improved after iso-inertial training.
  • The iso-inertial device allows to overload multidirectional movements in specific soccer conditions.
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