A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Step vs. Two-Phase Gradual Volume Reduction Tapering Protocols in Strength Training : Effects on Neuromuscular Performance and Serum Hormone Concentrations (2022)

Seppänen, S., & Häkkinen, K. (2022). Step vs. Two-Phase Gradual Volume Reduction Tapering Protocols in Strength Training : Effects on Neuromuscular Performance and Serum Hormone Concentrations. Journal of Strength and Conditioning Research, 36(10), 2771-2779. https://doi.org/10.1519/JSC.0000000000003939

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Seppänen, Stina; Häkkinen, Keijo

Lehti tai sarja: Journal of Strength and Conditioning Research

ISSN: 1064-8011

eISSN: 1533-4287

Julkaisuvuosi: 2022

Volyymi: 36

Lehden numero: 10

Artikkelin sivunumerot: 2771-2779

Kustantaja: Lippincott Williams & Wilkins; National Strength and Conditioning Association

Julkaisumaa: Yhdysvallat (USA)

Julkaisun kieli: englanti

DOI: https://doi.org/10.1519/JSC.0000000000003939

Julkaisun avoin saatavuus: Ei avoin

Julkaisukanavan avoin saatavuus: 

Tiivistelmä

This study assessed effects of 2 reduced volume tapering protocols on neuromuscular performance and serum hormone concentrations in 14 recreationally strength-trained men (21-30 years). After an 8-week strength training period subjects were divided to the step (54% volume reduction immediately) and 2-phase gradual (38% reduction for the first week and 70% for the second week) tapering groups for 2 weeks. One repetition maximum (1RM) squat, maximal isometric bilateral leg press force (leg press MVIC), electromyography (EMG) of vastus lateralis (VL) and vastus medialis, cross-sectional area of VL, serum testosterone, cortisol, and sex hormone-binding globuline (SHBG) concentrations were measured before and repeatedly during training and tapering periods. Both tapering protocols led to significant increases (p < 0.01) in squat 1RM. However, the increase in the step group (3.4 ± 2.1%) was higher (p < 0.05) than in the gradual group (1.7 ± 0.9%). The maximal integrated EMG of VL increased (p < 0.05) during tapering in the step group. Serum testosterone concentration increased (p < 0.05) and T/SHBG ratio reached the highest level after 1-week tapering in the step group. In the gradual group, T/SHBG ratio was (p < 0.05) higher after the taper than after the training period. Individual changes in T/SHBG ratio in the total group correlated positively (p < 0.05) with individual changes in leg press MVIC during the taper. These results suggest that reducing training volume can be an effective way to peak maximal strength. However, a higher volume reduction rate at the beginning of taper seems to lead to more favorable changes in maximal strength accompanied by positive changes in the neuromuscular system and serum hormone concentrations when taper follows an overreaching period.

YSO-asiasanat: voimaharjoittelu; harjoitusvaste; lihasvoima; hormonaaliset vaikutukset

Vapaat asiasanat: maximal strength; peaking phase; mechanisms

Liittyvät organisaatiot

OKM-raportointi: Kyllä

Raportointivuosi: 2023

JUFO-taso: 1