Early-Phase Satellite Cell and Myonuclear Domain Adaptations to Slow-Speed vs. Traditional Resistance Training Programs

摘要: The purpose of this investigation was to identify adaptations in satellite cell (SC) content and myonuclear domain (MND) after 6-week slow-speed vs. �normal-speed� resistance training programs. Thirty-four untrained females were divided into slow speed (SS), traditional strength (TS), muscular endurance (TE), nontraining control (C) groups. Three sets each leg press, squat, knee extension performed 2 days per week for the first 3 following 5 weeks. SS group 6�10 repetition maximum (6�10RM) set with 10-second concentric (con) 4-second eccentric (ecc) contractions repetition. Traditional TE 6�10RM 20�30RM, respectively, at �normal� (1�2 seconds con ecc contractions). trained same intensity (40�60% 1RM), whereas TS 80�85% 1RM. Pretraining posttraining muscle biopsies analyzed fiber cross-sectional area, type, SC content, number, MND. Satellite type I, IIA, IIAX, IIX fibers significantly increased TS. However, only IIAX SS, there no change or C. Myonuclear number did not any group. TS, MND IIA In conclusion, more than a similar normal speed. high-intensity normal-speed produced greatest degree adaptation variable.