Naslov
DIFFERENCES IN ACUTE NEUROMUSCULAR RESPONSES TO HIGH-INTENSITY INTERVAL TRAINING PRESCRIBED WITH TWO DIFFERENT AEROBIC FIELD TESTS

Autori
Bok, Daniel ; Ambruš, Paula

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings book of 2022 NSCA national conference / - : National Strength and Conditioning Association, 2022, 1-1

Skup
2022 NSCA National Conference

Mjesto i datum
New Orleans (LA), Sjedinjene Američke Države, 06.07.2022. - 09.07.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
training prescription ; acute reaction ; aerobic training

Sažetak
High-intensity interval training (HIIT) is the optimal training program for enhancing cardiorespiratory and metabolic function as it enables athletes to spend several minutes per session at ≥ 90% of maximal oxygen uptake (VO2max). As various field aerobic fitness tests are used for HIIT prescription, the acute reactions to training sessions can be different due to the significant differences in end-test speeds which are subsequently used for training prescription. Although acute cardiorespiratory and metabolic reactions are of primary importance for HIIT, the acute neuromuscular reaction is also important in the context of scheduling HIIT within the training microcycle. PURPOSE: The purpose of this study was to investigate the differences in acute neuromuscular responses between two HIIT sessions prescribed through 20-m Shuttle Run Test (20mSRT) and the 30-15 Intermittent Fitness Test (30-15IFT). METHODS: Fifteen young soccer players at the age of 17.8 ± 0.5 years participated in this study. All players were tested with the 20mSRT and the 30-15IFT and subsequently performed two 10-minute HIIT sessions comprised of 15 s work and 15 s recovery intervals. The intensity for the HIIT sessions prescribed by 30-15IFT (HIITIFT) and 20mSRT (HIITSRT) were 95% and 110% of their end- test velocities, respectively. To imitate the testing procedure as closely as possible, the HIITIFT and HIITSRT were performed on a 40 and 20 m courses, respectively. Heart rate (HR), blood lactate concentration (La) and ratings of perceived exertion (RPE) were used to assess the acute cardiorespiratory, metabolic and perceptual responses to HIIT. To assess the acute neuromuscular responses, the countermovement jump (CMJ), 25 m sprint (S25m) and repeated sprint test (RST), comprised of 6 × 25 m sprints with departure every 25 s, were performed before and immediately after the HIIT sessions. Analysis of variance for repeated measures (2 × 2) was used for the analysis of differences in assessed acute variables between the sessions. RESULTS: HRmean (173.7 ± 5.9 vs 160.8 ± 5.8 bpm), HRpeak (187.5 ± 7.9 vs 174.1 ± 6.4 bpm), time > 90% HRmax (357.5 ± 76 svs 76.7 ± 147.4 s), La (7.9 ± 2.1 vs 2.2 ± 1.8 mmol/l), and RPE (9.5 ± 0.6 vs 6.7 ± 0.7) were all significantly higher (p < .05) in HIITIFT in comparison to HIITSRT. CMJ (7.4% vs 7.3%) significantly improved, while 25 m sprint (1.9% vs 2.2%) and mean sprint time of the RST (2.1% vs 2.4%) significantly decreased (p < .05) after HIITIFT and HIITSRT, respectively, but with no significant differences between the HIIT sessions in either variable. CONCLUSIONS: HIIT sessions induce significant acute increase in jumping performance and significant acute decreases in sprinting and repeated sprinting performances. The HIITSRT induced identical acute neuromuscular responses to HIITIFT, but with significantly lower cardiorespiratory stimulus which is insufficient to induce optimal VO2max enhancement. To provide identical cardiorespiratory stimulus as HIITIFT, the intensity of the HIITSRT should be increased. However, that may also elicit greater acute neuromuscular performance decrements when compared to the HIITIFT. PRACTICAL APPLICATIONS: HIIT sessions can be used as potentiating activity to acutely enhance jumping performance, but sprinting activities will be compromised. If neuromuscular capacities need to be preserved following HIIT session, the strength and conditioning coaches should use HIIT prescribed through 30-15IFT.

Izvorni jezik
Engleski

Znanstvena područja
Kineziologija

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