Acute Effects of a Fatiguing Protocol on Peak Force and Rate of Force Development of the Hamstring Muscles in Soccer Players
Francesco Bettariga, Chris Bishop, Luca Martorelli, Anthony Turner, Stefano Giuseppe Lazzarini, Cristiano Algeri, Luca Maestroni
Acute Effects of a Fatiguing Protocol on Peak Force and Rate of Force Development of the Hamstring Muscles in Soccer Players
Hamstring strain injuries (HSI) represent a significant burden in soccer. High-speed running is one of the most common HSI mechanism, in particular during match congested periods. Peak force and rate of force development (RFD) of the hamstring muscles tested at long muscle length have shown reductions following fatiguing tasks. However, no study has used a meticulous fatiguing protocol nor reliability scores have been provided. Hamstring peak force, RFD50−100 and RFD100 −150 were assessed at long muscle length in 19 soccer players (26.0 ± 4.1 years) before and after the repeated sprint ability (RSA) test. We aimed to calculate reliability scores for both limbs before and after the fatiguing task, and to compare peak force, RFD50−100 and RFD100−150 following the RSA test to baseline values. Peak force displayed “excellent” reliability scores before and after the RSA test, whereas RFD ICC showed “good” values in both time points, but CV scores were not acceptable (i.e. > 10%). Significant moderate to large decreases were found in peak force (g = − 1.11 to − 0.90), RFD50−100 (g = − 1.37 to − 1.11) and RFD100−150 (g = − 0.84 to − 0.69) in both dominant and non-dominant limbs. Maximal isometric peak force, RFD50−100 and RFD100−150 of the hamstrings tested at long muscle length reduced following the RSA test. However, only peak force displayed “excellent” reliability scores, whereas RFD measures could not be considered acceptable owing to their lower reliability scores. Thus, practitioners can be confident about peak force changes, whilst caution should be used when examining such changes in RFD.
Football / Posterior chain / Rapid muscle contraction / Strength
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