Table 3

Regression analysis between heart rate responses (beats/min) and age (years) for national and club standard orienteers, and combined groups

Factor	Group	Heart rate correlation with age	r² Value	p Value
Peak heart rate (HR_PEAK)	Combined	HR_PEAK = −0.256 age + 191	0.131	0.140
	National	HR_PEAK = −0.333 age + 197	0.193	0.276
	Club	HR_PEAK = −0.281 age + 190	0.166	0.243
Mean heart rate (HR_MEAN)	Combined	HR_MEAN = −0.079 age + 166	0.008	0.732
	National	HR_MEAN = −0.412 age + 190	0.274	0.183
	Club	HR_MEAN = −0.020 age + 159	<0.001	0.950
Within race heart rate SD (HR_SD)	Combined	HR_SD = −0.091 age + 13	0.137	0.131
	National	HR_SD = −0.015 age + 7	0.014	0.777
	Club	HR_SD = −0.059 age + 14	0.212	0.180
HR_PEAK as % of 220−age	Combined	% predicted HR_max = 0.468 age + 82	0.593	<0.001
HR_MEAN as % of 220−age	Combined	% predicted HR_max = 0.517 age + 71	0.492	<0.002