Table 3.

Stretch-activated tension

Species/Solution	ASA	PSA	FSA	Hill coefficient	pCa50
Dros/Swank	9.2 ± 0.8 [12]LS LR	5.7 ± 0.4 [12]LS LR	3.5 ± 0.5 [12]LS LR	1.92 ± 0.24 [9]DR LS LR	6.05 ± 0.05 [9]LS
Leth/Swank	38.8 ± 2.6 [10]DS DR LR	23.0 ± 1.8 [10]DS DR	15.8 ± 1.0 [10]DS DR LR	1.01 ± 0.03 [10]DS	5.60 ± 0.04 [10]DS DR LR
Dros/Reedy	10.8 ± 1.2 [10]LS LR	6.5 ± 0.8 [10]LS LR	4.3 ± 0.6 [10]LS LR	1.29 ± 0.19 [9]DS	6.09 ± 0.14 [9]LS
Leth/Reedy	52.5 ± 1.1 [10]DS DR LS	21.4 ± 0.9 [10]DS DR	31.1 ± 1.1 [10]DS DR LS	1.14 ± 0.03 [10]DS	6.29 ± 0.04 [10]LS

All values are means ± SE. A_SA, total active stretch tension (pCa 5.0); P_SA, passive stretch tension (pCa 8.0); F_SA, corrected active stretch tension (F_SA = A_SA − P_SA). Graphs of the relationship between stretch-activated tension, F_SA, and calcium concentration from individual fibers were fit with the Hill equation to obtain the average Hill coefficient and pCa₅₀ values. Square brackets indicate number of fibers tested. Superscript letters indicate statistical difference between the four sets of fibers based on one-way ANOVA with Holm-Sidak pairwise multiple comparisons, P < 0.05. DS = Drosophila fibers bathed in Swank solutions; DR = Drosophila fibers bathed in Reedy solutions; LS = Lethocerus fibers bathed in Swank solutions; LR = Lethocerus fibers bathed in Reedy solutions.