Effects of oral contraceptive use on muscle strength, muscle thickness, and fiber size and composition in young women undergoing 12 weeks of strength training: a cohort study

Table 3 Microscopic muscle parameters in young women before and after 12 weeks of submaximal strength training

		non-OC (n = 14)		OC (n = 12)		Non-OC versus OC		G × T
Variables	Testing	Type 1	Type 2	Type 1	Type 2	^ap	^bp	G × T
NO (%)	Pre	42.67 ± 12.52	57.33 ± 12.52	44.12 ± 15.00	55.88 ± 15.00	0.729	0.729	¹0.840
	Post	40.81 ± 12.61	59.19 ± 12.61	35.95 ± 13.37	60.05 ± 13.37	0.762	0.747	²0.840
	P	0.305	0.283	0.156	0.156
	Δ	− 1.86 ± 6.49	+ 1.86 ± 6.49	− 4.17 ± 9.48	− 4.17 ± 9.48	0.158	0.169
MFT (μm)	Pre	53.43 ± 6.51	46.24 ± 7.67	53.45 ± 6.33	51.83 ± 6.79	0.771	0.784	¹0.432
	Post	56.83 ± 6.51	53.39 ± 6.63	54.29 ± 5.95	55.90 ± 8.87	0.563	0.345	²0.432
	P	0.100	0.003	0.723	0.158
	Δ	+ 3.41 ± 7.19	+ 7.15 ± 7.50	+ 0.84 ± 800	+ 4.07 ± 9.30	0.876	0.435
N/F ratio	Pre	3.04 ± 0.63		3.20 ± 0.65		0.912		0.258
	Post	3.65 ± 1.02		3.35 ± 0.77		0.400
	P	0.044		0.597
	Δ	+ 0.61 ± 1.02		+ 0.15 ± 0.97		0.866

^aType 1 fibers, ^btype 2 fibers. Non-OC, women not receiving oral contraceptives; OC, women receiving oral contraceptives; G × T, group × time interaction; Pre, pre-training; Post, post-training; NO, muscle fiber ratio; MFT, muscle fiber thickness; N/F ratio, nucleus/fiber ratio

ISSN: 1472-6874