. 2024 Nov 4;25(11):392. doi: 10.31083/j.rcm2511392

Table 1.

Grading of different intensities exercise.

	Human								Animal
	Absolute exercise intensity (METs) in adults (age in years)				Relative exercise intensity				Mouse	Rat
Classification	20–39 yr	40–64 yr	65–79 yr	80+ yr	%VO_2max	%HR_max	%HRR	%1 RM	Running speed (m/min)
Low intensity	2.4–4.7	2.0–3.9	1.6–3.1	1.1–1.9	$<$ 40	35–54	20–39	30–50	$<$ 10	$<$ 16
Moderate intensity	4.8–7.1	4.0–5.9	3.2–4.7	2.0–2.9	40–60	55–69	40–59	51–70	10–20	16–24
High intensity	7.2–10.1	6.0–8.4	4.8–6.7	3.0–4.25	$>$ 60	70–89	60–84	71–85	$>$ 20	$>$ 24

METs, metabolic equivalents; yr, year; VO_2max, maximal oxygen uptake; HR_max, maximal heart rate; HRR, heart rate reserve; 1 RM, one repetition maximum.