Sprint Training in Soccer is a determinant component in performance therefore ATP-PCr energy system has a critical role in the competition for high intensity actions. Its suggest ATP-PCr energy system should be trained with the highest specificity for correct adaptation and support sprint performance.
PURPOSE: To determine an effective rest time for repeated sprint ability training without decreased in performance (speed) during bout’s sequence.
METHODS: 15 male soccer’s players (17.7±0.5 years) performed 2 sprint of 4 sets (4 rep. x 30-m) all-out bouts, in 2 different days, with 5-days rest between bouts. Sprint protocols were: a)- 4 sets (4 reps. x 30-m) with 60-second and 3-minutes rest, between reps and sets, respectively (ATP-PCr1); b)- 4 sets (4 reps. x 30-m) with 30-second and 3-minutes rest, between reps and sets, respectively (ATP-PCr2). We register time of each rep. (sec., measured by photocells), blood lactate levels (La) and heart rate (HR), at the end of the set. A two-way repeated measurement ANOVAs was performed to determine statistical differences (SD) at p < 0.05. When we detect SD in any ANOVA analysis, we apply Tuckey Test to determine which variables are different.
RESULTS: We find no SD between 1-2-3-4 set’s speed (m/sec) in ATP-PCr1 or ATP-PCr2, respectively. However, exists SD (p<0,05) between ATP-PCr1 vs. ATP-PCr2 in speed (7.017±0.448 vs. 6.820±0.225 m/sec., respectively); La (5.96±1.62 vs. 5.30±1.44 mMol/l., respectively); and HR (166.43±11.41 vs. 170.35±11.35 bpm, respectively).
Additionally, we find a low correlation coefficient (r) between La and HR values in each test (ATP-PCr1: r=0,50; ATP-PCr2: r=0,52).
CONCLUSION: The main conclusions of the present study are three-fold: 1) Decrease speed’s performance in ATP-PCr2, influenced by shorter rest time, hypothetically for less PCr rephosphorylate rate; 2) La level is higher in ATP-PCr1 for significant high speed (assuming more elevated glycolitic rate); 3) Evidence for low r between La vs. HR, showing that HR is not a valid and reproducible variable to control intensity of sprint training.