Table 1
Effect of age on physiologic parameters in field test of endurance horses

Items	Group	Experimental conditions (M ± SD)				Sig.
Items	Group	T0	T1	T2	T3	Sig.
Heart Rate	G1	44.00^Aa ± 0.72	139.4^Ab ± 17.24	78.00^Ac ± 12.06	61.20^Ac ± 13.52	***
	G2	46.00^Aa ± 3.70	138.43^Ab ± 13.05	90.29^Ab ± 9.95	71.43^Ab ± 7.43	***
	G3	45.14^Aa ± 3.53	124.00^Ab ± 23.31	71.00^Bb ± 14.32	55.43^Ba ± 9.93	***
Lactate	G1	0.72^Aa ± 0.11	11.08^Ab ± 4.69	5.06^Aa ± 4.01	2.68^Aa ± 2.32	***
	G2	1.09^Aa ± 0.15	9.76^Ab ± 1.07	3.81^Ab ± 1.65	2.43^Aa ± 1.20	***
	G3	1.10^Aa ± 0.38	9.71^Ab ± 3.55	3.23^Aa ± 1.76	1.74^Aa ± 0.78	***