Comparison between concentric‑only, eccentric‑only, and concentric–eccentric resistance training of the elbow flexors for their effects on muscle strength and hypertrophy

Abstract

Purpose: This study compared concentric–eccentric coupled (CON-ECC), concentric-only (CON), and eccentric-only (ECC) resistance training of the elbow flexors for their effects on muscle strength and hypertrophy. Methods: Non-resistance-trained young adults were assigned to one of the four groups: CON-ECC (n = 14), CON (n = 14) and ECC (n = 14) training groups, and a control group (n = 11) that had measurements only. The training group participants performed dominant arm elbow flexor resistance training in extended elbow joint angles (0°–50°) twice a week for 5 weeks. The total training volume (dumbbell weight × number of contractions) in CON-ECC (5745 ± 1020 kg) was double of that in CON (2930 ± 859 kg) and ECC (3035 ± 844 kg), because 3 sets of 10 contractions were performed for both directions in CON-ECC. Maximum voluntary isometric (MVC-ISO), concentric (MVC-CON), and eccentric contraction (MVC-ECC) torque of the elbow flexors and biceps brachii and brachialis muscle thickness (MT) were measured at baseline, and 3–9 days post-last training session. Results: No significant changes in any measures were evident for the control group. The CON-ECC and ECC groups showed increases (P < 0.05) in MVC-ISO (12.0 ± 15.7% and 11.3 ± 10.8%, respectively) and MVC-ECC torque (12.5 ± 18.3%, 16.2 ± 11.0%) similarly. Increases in MVC-CON torque (P < 0.05) were evident for the CON-ECC (17.5 ± 13.5%), CON (10.5 ± 12.8%), and ECC (14.2 ± 10.4%) groups without a significant difference among groups. MT increased (P < 0.01) after CON-ECC (10.6 ± 5.4%) and ECC (9.7 ± 7.2%) similarly, but not significantly after CON (2.5 ± 4.8%). Conclusions: ECC training increased muscle strength and thickness similarly to CON-ECC training, despite the half training volume, suggesting that concentric contractions contributed little to the training effects.

Document Type

Journal Article

Date of Publication

1-1-2022

Publication Title

European Journal of Applied Physiology

Publisher

Springer

School

School of Medical and Health Sciences / Centre for Human Performance

RAS ID

46953

Funders

Yamaha Motor Foundation for Sports (Japan)

Comments

Sato, S., Yoshida, R., Murakoshi, F., Sasaki, Y., Yahata, K., Kasahara, K., ... & Nakamura, M. (2022). Comparison between concentric-only, eccentric-only, and concentric–eccentric resistance training of the elbow flexors for their effects on muscle strength and hypertrophy. European Journal of Applied Physiology, 122, 2607-2614. https://doi.org/10.1007/s00421-022-05035-w.

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Link to publisher version (DOI)

10.1007/s00421-022-05035-w.