Table 5.

Work and power generation of Drosophila jump muscles measured using the work loop technique

	Pi, mM	Work, J/m3	Power, W/m3	Frequency, Hz	n
Control	0	−5.7 ± 0.7	−202.9 ± 32.4	35.6 ± 3.7	9
	8	−4.0 ± 1.0	−127.8 ± 31.2*	31.9 ± 5.2	8
	16	−1.7 ± 0.3*	−46.5 ± 6.9*	27.3 ± 6.7	7
IFI	0	−7.5 ± 0.7#	−328.6 ± 42.9#	43.9 ± 4.5	9
	8	−3.2 ± 0.2*	−60.5 ± 18.9*	17.8 ± 4.8*	9
	16	−2.0 ± 0.2*	−33.5 ± 12.6*	16.7 ± 4.9*	9

Values are means ± SE. n, no. of fibers; work, power and frequency at which the maximal work and power was generated for 0.5% strain.

^*Statistically significant compared with 0 mM Pi, P < 0.05 (Student’s t-test). Measurements were made at pCa 5.0 and 15°C.

^#Statistically significant compared with the control value at the given Pi concentration, P < 0.05 (Student’s t-test).