Table 1. Voluntary running distance, body weight and muscle weight of the plantaris muscle. Values are means (±SD).

	Control group (n = 5)	Training group (n = 12)
Voluntary running distance (m·day-1)		6570 (1773)
Pre-training body weight (g)	133.8 (5.1)	134.7 (7.2)
Post-training body weight (g)	303.9 (16.1)	259.5 (15.0) *
Muscle weight (mg)	300.8 (15.4)	300.6 (20.7)

* Significantly different from control group, p < 0.05.