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The Journal of Sports Medicine and Physical Fitness 2021 Apr 19

DOI: 10.23736/S0022-4707.21.12281-9

Copyright © 2021 EDIZIONI MINERVA MEDICA

lingua: Inglese

The effects of free weights and iso-inertial resistance during semi-squatting exercise on amateur soccer players’ physical performance indicators: a randomized controlled study

Andreas FOUSEKIS 1, Konstantinos FOUSEKIS 2, Georgios FOUSEKIS 2, Vasiliki MANOU 3, Yiannis MICHAILIDIS 1 , Charalambos ZELENITSAS 4, Thomas METAXAS 1

1 Laboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Thessaloniki, Greece; 2 Therapeutic Exercise and Sports Rehabilitation Laboratory, hysiotherapy Department, University of Patra, Patra, Greece; 3 Department of Human Performance, School of Physical Education and Sport Science, Aristotle University of Thessaloniki, Thessaloniki, Greece; 4 Section of Sport Medicine and Biology of Exercise, School of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, Greece


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BACKGROUND: The aim was to compare the effects of two lower extremity strengthening programs using iso-inertial resistance or free weights on amateur soccer players’ physical performance indicators.
METHODS: Thirty-five amateur soccer players (average age 22.6±5.1 years) were randomly assigned to iso-inertial group (n=11) or free-weight group (n=11), or control group (n=13). The groups performed two training sessions per week for six weeks. Before and after the strengthening implementation, physical performance indicators were evaluated, including the isokinetic knee extensors and flexors’ strength, power, speed, and agility. The significance level was set at p<0.05.
RESULTS: The iso-inertial training resistance led to an increase in the hamstrings’ eccentric strength at 60°/s and 150°/s (p<0.05) compared to the free-weight resistance (p>0.05) and the controls (p>0.05). No other significant adaptations were observed in the other isokinetic strength, power, speed (10-m, p=0.052) and agility measurements (Illinois agility test, p=0.059). In ratio (knee flexors/knee extensors) the only differences observed was at 150 o/s for iso-inertial group (p<0.05).
CONCLUSIONS: Iso-inertial resistance training during semi squatting can enhance the hamstrings’ eccentric performance andthe soccer players’ speed and agility compared to the classic free-weight training program, which should considered when designing strength and injury prevention programs.


KEY WORDS: Iso-inertial load; Free weight; Resistance training; Soccer

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