Table 1.

Half-sarcomere lengths before and after stretch in a myofibril of six sarcomeres. Note that half-sarcomeres before stretch were non-uniform. The difference in length between long (L) and short (S) half-sarcomeres in a sarcomere is reduced after stretch. In most half-sarcomeres, the elasticity modulus (E) of long half-sarcomeres is higher than that of the short ones. This might be explained by differences in the proportion of two coexisting titin isoforms in half-sarcomeres.

	sarcomere 1		sarcomere 2		sarcomere 3		sarcomere 4		sarcomere 5		sarcomere 6
	L	S	L	S	L	S	L	S	L	S	L	S
before stretch	1.26	1.00	1.22	0.97	1.39	0.97	1.20	0.95	1.01	0.99	1.13	1.10
after stretch	1.68	1.58	1.69	1.57	1.74	1.61	1.72	1.61	1.70	1.65	1.72	1.71
E (kN m−2)	233.6	134.7	204.6	124.1	310.7	116.0	180.6	112.7	113.8	118.2	151.9	140.6