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Article

Effects of Adding Inter-Set Static Stretching to Flywheel Resistance Training on Flexibility, Muscular Strength, and Regional Hypertrophy in Young Men

1
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata 950-3198, Japan
2
Central Sports Co., Ltd, 1-21-2 Shinkawa, Chuo-ku, Tokyo 104-8255, Japan
3
Department of Physical Therapy, Faculty of Rehabilitation, Kobe International University, Hyogo 658-0032, Japan
4
Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina 86050-070, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Paul B. Tchounwou
Int. J. Environ. Res. Public Health 2021, 18(7), 3770; https://doi.org/10.3390/ijerph18073770
Received: 11 March 2021 / Revised: 30 March 2021 / Accepted: 31 March 2021 / Published: 4 April 2021
(This article belongs to the Special Issue Muscle Responses and Adaptation in Exercise, Sport and Health)
Performing static stretching (SS) during resistance training (RT) rest periods is posited to potentiate muscular adaptations, but the literature is scarce on the topic. Thus, the purpose of this study was to investigate the effects of adding inter-set SS to a lower-limb flywheel RT program on joint flexibility, muscular strength, and regional hypertrophy. Sixteen untrained male adults (21 ± 1 y) completed the study, where they performed progressive flywheel bilateral squatting twice a week for 5 weeks. One leg of each participant was randomly allocated to perform SS during the inter-set rest period (RT+SS), while the other leg served as control (RT only). Before and after the intervention, knee flexion range of motion; knee extension isometric, concentric, and eccentric peak torque; 1-repetition maximum; and muscle thickness of the lower-limb muscles were assessed. Following the training period, additional effects were observed for the inter-set SS side on increasing joint flexibility (p < 0.05), whereas the average increase in strength measures was 5.3% for the control side, and 10.1% for the inter-set SS side, however, SS intervention induced significantly greater gains only for knee extension isometric strength, but not for dynamic 1-RM, concentric, and eccentric tests. Hamstrings and gluteus maximus did not hypertrophy with training; increases quadriceps muscle thickness depended on the site/portion analyzed, but no significant difference was observed between legs (average: RT = 7.3%, RT+SS = 8.0%). The results indicate that adding inter-set SS to RT may provide large gains in flexibility, slightly benefits for muscular strength (especially for isometric action), but do not impact muscle hypertrophy in untrained young men. View Full-Text
Keywords: ultrasound; maximal voluntary isometric contraction; concentric strength; eccentric strength; muscle thickness; advanced techniques ultrasound; maximal voluntary isometric contraction; concentric strength; eccentric strength; muscle thickness; advanced techniques
MDPI and ACS Style

Nakamura, M.; Ikezu, H.; Sato, S.; Yahata, K.; Kiyono, R.; Yoshida, R.; Takeuchi, K.; Nunes, J.P. Effects of Adding Inter-Set Static Stretching to Flywheel Resistance Training on Flexibility, Muscular Strength, and Regional Hypertrophy in Young Men. Int. J. Environ. Res. Public Health 2021, 18, 3770. https://doi.org/10.3390/ijerph18073770

AMA Style

Nakamura M, Ikezu H, Sato S, Yahata K, Kiyono R, Yoshida R, Takeuchi K, Nunes JP. Effects of Adding Inter-Set Static Stretching to Flywheel Resistance Training on Flexibility, Muscular Strength, and Regional Hypertrophy in Young Men. International Journal of Environmental Research and Public Health. 2021; 18(7):3770. https://doi.org/10.3390/ijerph18073770

Chicago/Turabian Style

Nakamura, Masatoshi, Hirotaka Ikezu, Shigeru Sato, Kaoru Yahata, Ryosuke Kiyono, Riku Yoshida, Kosuke Takeuchi, and João Pedro Nunes. 2021. "Effects of Adding Inter-Set Static Stretching to Flywheel Resistance Training on Flexibility, Muscular Strength, and Regional Hypertrophy in Young Men" International Journal of Environmental Research and Public Health 18, no. 7: 3770. https://doi.org/10.3390/ijerph18073770

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