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Indexed/Abstracted in: BIOSIS Previews, EMBASE, Scopus, Emerging Sources Citation Index
Online ISSN 1827-1812
Lehnert M. 1, Psotta R. 2, Botek Z. 3
1 Department of Sports, Faculty of Physical Culture, Palacky University, Olomouc, Czech Republic;
2 Department of Natural Sciences in Kinanthropology, Faculty of Physical Culture, Palacky University, Olomouc, Czech Republic;
3 Department of Sports, Faculty of Physical Culture, Palacky University, Olomouc, Czech Republic
Aim. The aim of this study was to compare the training effects of high-resistance versus plyometric training of the lower extremities in adolescent soccer players used in a preseason period.
Methods. Elite soccer (football) players (N.=16, age 17.8±1.7 years) were randomly assigned to a high-resistance training group (HRG) and a plyometric training group (PG). The strength training in the HRG consisted of half-squats on a multipress with 85-90% 1 RM, while in the PG various types of jump exercises were used. Within a five-week program, strength training was included in 13 of the 35 training units. The following pre- and post-measurements were completed: unilateral concentric strength of knee flexors and extensors on an isokinetic dynamometer, 10-m and 30-m running sprint tests, counter-movement jump with arms and arms fixed at shoulders on a dynamometric platform.
Results. Significant positive changes after the intervention were only observed in the average work produced during a knee flexion by the dominant leg (150.3±25 J versus 180.0±26.6 J; P<0.05) and the ratio of dominant/non-dominant-leg peak torque during knee extensions in the PG (0.93±0.18 vs. 1.02±0.20; P<0.05). Some training-induced changes in mechanical work during isokinetic flexion and extension in the PG were not accompanied by significant improvement of counter movement jumps and sprint performance.
Conclusion. Both high resistance and plyometric exercises applied in adolescent soccer players 2 to 3 times a week during the 5-week training did not induce significant improvement in isokinetic leg strength, jump and sprint performance.