Table 1.

Biometrics, when tested for swimming, of males used in the experimental response to exercise and controls. (Mean±1 s.e.)

	sib pairs (n=13)			non-sib controls (n=13)
	GG	PG	paired t-test	GG	PG	paired t-test
SL (mm)	42.07±0.93	42.19±0.94	t=0.11, p=0.92	43.11±0.99	43.79±1.64	t=0.48, p=0.64
TL (mm)	73.69±1.71	74.22±1.57	t=0.23, p=0.82	73.61±1.66	77.24±3.13	t=1.35, p=0.20
mass (g)	1.451±0.115	1.551±0.116	t=0.75, p=0.47	1.739±0.144	1.819±0.234	t=0.35, p=0.73