Biology of Sport
eISSN: 2083-1862
ISSN: 0860-021X
Biology of Sport
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3/2019
vol. 36
 
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abstract:
Original paper

Effects of in-season enhanced negative work-based vs traditional weight training on change of direction and hamstrings-to-quadriceps ratio in soccer players

Giuseppe Coratella
1
,
Marco Beato
2
,
Emiliano Cè
1, 3
,
Raffaele Scurati
1
,
Chiara Milanese
4
,
Federico Schena
4
,
Fabio Esposito
1, 3

1.
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy
2.
Faculty of Health and Science, Department of Science and Technology, University of Suffolk, Ipswich, UK
3.
IRCSS Istituto Ortopedico Galeazzi, Milano, Italy
4.
Department of Neurological, Biomedical and Movement Sciences, Università degli Studi di Verona, Italy
Biol Sport. 2019;36(3):241–248.
Online publish date: 2019/08/14
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The present study investigated the effects of in-season enhanced negative work-based training (ENT) vs weight training in the change of direction (COD), sprinting and jumping ability, muscle mass and strength in semi-professional soccer players. Forty male soccer players participated in the eight-week, 1 d/w intervention consisting of 48 squat repetitions for ENT using a flywheel device (inertia=0.11 kg·m-2) or weight training (80%1 RM) as a control group (CON). Agility T-test, 20+20 m shuttle, 10 m and 30 m sprint, squat jump (SJ) and countermovement jump (CMJ), lean mass, quadriceps and hamstrings strength and the hamstrings-to-quadriceps ratio were measured. Time on agility T-test and 20+20 m shuttle decreased in ENT (effect-size =-1.44, 95% CI -2.24/-0.68 and -0.75, -1.09/-0.42 respectively) but not in CON (-0.33, -0.87/0.19 and -0.13, -0.58/0.32). SJ and CMJ height increased in both ENT (0.71, 0.45/0.97 and 0.65, 0.38/0.93) and CON (0.41, 0.23/0.60 and 0.36, 0.12/0.70). Overall, quadriceps and hamstrings strength increased in both ENT and CON (0.38/0.79), but the hamstrings-to-quadriceps ratio increased in ENT (0.31, 0.22/0.40) but not in CON (0.03, -0.18/0.24). Lean mass increased in both ENT (0.41, 0.26/0.57) and CON (0.29, 0.14/0.44). The repeated negative actions performed in ENT may have led to improvements in braking ability, a key point in COD performance. Semiprofessional soccer players may benefit from in-season ENT to enhance COD and the negative-specific adaptations in muscle strength and hamstrings-to-quadriceps ratio.
keywords:

Football, Team sport, Flywheel, Isokinetic strength, Sprint ability, Jump performance, Eccentric exercise

 
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