Influence of Second Generation Oral Contraceptive Use on Adaptations to Resistance Training in Young Untrained Women.

Autor:	Dalgaard LB; Department of Public Health, Aarhus University, Aarhus C, Denmark., Jørgensen EB; Department of Public Health, Aarhus University, Aarhus C, Denmark., Oxfeldt M; Department of Public Health, Aarhus University, Aarhus C, Denmark., Dalgaard EB; Department of Clinical Medicine, Diagnostic Center, Silkeborg Regional Hospital, Silkeborg, Denmark., Johansen FT; Department of Public Health, Aarhus University, Aarhus C, Denmark., Karlsson M; Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark ; and., Ringgaard S; The MR Research Center, Aarhus University, Aarhus N, Denmark., Hansen M; Department of Public Health, Aarhus University, Aarhus C, Denmark.
Jazyk:	angličtina
Zdroj:	Journal of strength and conditioning research [J Strength Cond Res] 2022 Jul 01; Vol. 36 (7), pp. 1801-1809. Date of Electronic Publication: 2020 Jul 20.
DOI:	10.1519/JSC.0000000000003735
Abstrakt:	Abstract: Dalgaard, LB, Jørgensen, EB, Oxfeldt, M, Dalgaard, EB, Johansen, FT, Karlsson, M, Ringgaard, S, and Hansen, M. Influence of second generation oral contraceptive use on adaptations to resistance training in young untrained women. J Strength Cond Res 36(7): 1801-1809, 2022-The study purpose was to determine effects of using second generation oral contraceptives (OC) on muscle adaptations to resistance training in young untrained women. Twenty users and 18 nonusers of OC completed a 10-week supervised progressive resistance training program. Before and after the intervention, muscle cross-sectional area (mCSA) of the quadriceps was measured using magnetic resonance imaging and muscle fiber CSA (fCSA) was determined by immunohistochemistry. In addition, body composition (DXA, fat mass/fat-free mass), maximal isometric muscle strength (dynamometry), 5 repetition maximum (5RM) leg press strength, counter movement jump (CMJ) height, and average power using a modified Wingate test were determined. Serum hormone analysis ensured OC compliance and 4-day food records documented dietary intake. After the training period, quadriceps mCSA (OC: 11.0 ± 6.0% vs. non-OC: 9.2 ± 5.0%, p = 0.001), type II fCSA (OC: 19.9 ± 7.9% vs. non-OC: 16.6 ± 7.2%, p = 0.05), muscle strength (knee extension, knee flexion and 5RM, p < 0.001), and functional power (CMJ, AP, p < 0.001) were significantly increased with no significant difference between the groups. However, a tendency toward a greater increase in fat-free mass (FFM) in the OC group was observed (OC: 3.7 ± 3.8% vs. non-OC: 2.7 ± 3.5%, p = 0.08). Collectively, use of second generation OCs in young untrained women did not significantly improve adaptations to 10 weeks of resistance training compared with nonusers. The trend toward greater gains in FFM in the OC group warrant future studies. (Copyright © 2020 National Strength and Conditioning Association.)
Databáze:	MEDLINE
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