Myosin Isoforms and Contractile Properties of Single Fibers of Human Latissimus Dorsi Muscle

Table 1

Comprehensive table of LDM fibers analysis. Significance between male and female is shown.

	Total; (mean ± SEM)	Male; (mean ± SEM)	Female; (mean ± SEM)	Male versus female
Single fibers characteristics
CSA μm^2	4654.81±273.08	6157.12±495.86	3478.01±187.96	𝑃<0.0001
𝐹0 mN	0.61±0.04	0.85±0.06	0.43±0.03	𝑃<0.0001
𝑃0 mN/mm^2	143.39±7.74	160.54±13.48	129.96±8.59	n.s.
Densitometry (% of MyHC)
MyHC 1	32.84±1.30	30.16±2.06	35.21±1.27	𝑃<0.05
MyHC 2A	41.29±2.06	45.81±3.04	37.28±2.15	𝑃<0.05
MyHC 2X	24.89±1.88	24.03±2.27	25.66±3.04	n.s.
% of number of fibers
MyHC 1	28.36±0.05	21.09±0.07	35.64±0.05	𝑃<0.0001
MyHC 2A	30.24±0.05	29.58±0.07	30.91±0.08	𝑃<0.0001
MyHC 2X	3.65±0.04	0.00±0.00	7.27±0.07	𝑃<0.0001
MyHC 2A2X	30.97±0.07	43.88±0.10	18.06±0.05	𝑃<0.0001
MyHC 1 2A	5.21±0.02	5.45±0.04	4.97±0.02	𝑃<0.0001
MyHC 1 2A 2X	1.58±0.01	0.00±0.00	3.15±0.02	𝑃<0.0001
MyHC 1 2X	0.00±0.00	0.00±0.00	0.00±0.00	//