. Author manuscript; available in PMC: 2017 Jun 1.

Published in final edited form as: J Phys Act Health. 2016 Jun;13(6 Suppl 1):S29–S34. doi: 10.1123/jpah.2015-0728

Table 3.

Oxygen uptake (VO₂) and youth METs during treadmill walking.

Treadmill Speed	n	Absolute VO₂ (L/min)			Min-Max	Mass-specific VO₂ (ml/kg/min)			Min-Max	MET_y1			Min-Max	MET_y2			Min-Max
13.4 m/min
6-9y	19	0.40	±	0.11^a	0.27-0.70	12.54	±	2.55^a	8.26-17.58	1.62	±	0.28	1.18-2.30	2.38	±	0.33	1.88-3.05
10-12y	18	0.48	±	0.08^ab	0.39-0.68	10.25	±	2.06^ab	7.25-14.07	1.86	±	0.25	1.61-2.63	2.43	±	0.35	1.80-3.13
13-15y	23	0.52	±	0.13^ab	0.26-0.91	7.96	±	1.65^b	3.72-10.14	1.96	±	0.34	1.31-2.55	2.19	±	0.37	1.15-2.78
16-18y	17	0.56	±	0.14^b	0.35-0.95	8.46	±	1.19^b	6.28-10.64	1.94	±	0.37	1.34-2.77	2.38	±	0.29	1.89-3.05
26.8 m/min
6-9y	27^†	0.45	±	0.12^a	0.28-0.86	13.76	±	2.73^a	8.11-18.55	1.85	±	0.34^a	1.25-2.82	2.62	±	0.37	1.85-3.48
10-12y	19	0.56	±	0.10^ab	0.42-0.82	11.45	±	2.23^ab	8.23-15.84	2.13	±	0.31^ab	1.66-2.97	2.77	±	0.40	2.05-3.52
13-15y	23	0.62	±	0.14^b	0.44-1.10	9.48	±	1.56^b	6.20-12.25	2.27	±	0.38^ab	1.52-3.07	2.58	±	0.30	1.99-3.27
16-18y	20	0.66	±	0.16^b	0.39-1.09	9.60	±	1.89^b	6.16-12.52	2.32	±	0.50^b	1.54-3.33	2.72	±	0.42	2.12-3.55
40.2 m/min
6-9y	22^†	0.52	±	0.14^a	0.34-0.96	15.12	±	2.58^a	10.17-19.23	2.09	±	0.37^a	1.36-3.13	2.94	±	0.32	2.32-3.73
10-12y	17	0.63	±	0.12^ab	0.46-0.92	12.49	±	1.99^ab	9.55-15.78	2.33	±	0.34^ab	1.79-3.08	3.08	±	0.36	2.38-3.72
13-15y	22	0.71	±	0.18^ab	0.48-1.33	10.78	±	1.91^b	7.26-13.93	2.58	±	0.51^ab	1.66-3.72	2.95	±	0.40	2.33-3.97
16-18y	21	0.76	±	0.20^b	0.47-1.37	11.30	±	2.07^b	7.59-15.87	2.68	±	0.56^b	1.99-3.98	3.19	±	0.47	2.53-4.21
53.6 m/min
6-9y	22^†	0.58	±	0.11^a	0.39-0.78	17.77	±	3.34^a	12.62-24.07	2.37	±	0.38^a	1.49-3.02	3.40	±	0.42	2.75-4.18
10-12y	19	0.72	±	0.13^ab	0.56-1.12	14.77	±	2.24^ab	10.47-17.63	2.72	±	0.49^ab	1.95-3.82	3.55	±	0.38	2.77-4.36
13-15y	23	0.81	±	0.20^b	0.55-1.45	12.37	±	2.08^b	8.85-15.78	2.95	±	0.56^ab	1.88-4.06	3.43	±	0.48	2.65-4.61
16-18y	21	0.86	±	0.24^b	0.52-1.56	12.50	±	1.98^b	9.71-15.73	3.05	±	0.69^b	2.34-5.19	3.54	±	0.45	2.89-4.46
67.1 m/min
6-9y	21	0.65	±	0.14^a	0.46-0.90	19.77	±	3.48^a	14.83-27.03	2.69	±	0.51^a	1.74-3.59	3.82	±	0.48	3.08-4.70
10-12y	19	0.85	±	0.17^ab	0.63-1.29	17.62	±	2.80^ab	12.64-24.35	3.24	±	0.70^ab	2.21-4.53	4.24	±	0.54	3.51-5.52
13-15y	24	0.97	±	0.22^b	0.66-1.66	14.68	±	2.16^b	10.46-18.18	3.53	±	0.66^b	2.27-4.68	4.04	±	0.50	3.18-5.00
16-18y	20	0.94	±	0.26^b	0.56-1.81	14.28	±	2.13^b	10.99-18.26	3.31	±	0.66^ab	2.45-4.71	4.01	±	0.54	3.12-4.93
80.5 m/min
6-9y	16	0.77	±	0.17^a	0.56-1.10	22.68	±	4.17^a	16.88-30.74	3.07	±	0.61^a	1.97-4.23	4.40	±	0.52	3.55-5.34
10-12y	20	0.98	±	0.20^ab	0.70-1.42	20.35	±	3.09^ab	15.71-26.96	3.74	±	0.80^ab	2.49-5.53	4.85	±	0.62	4.05-6.63
13-15y	24	1.16	±	0.25^b	0.75-1.88	17.22	±	2.48^b	12.06-20.73	4.23	±	0.74^b	2.60-5.50	4.81	±	0.55	3.65-5.99
16-18y	19	1.07	±	0.30^ab	0.66-2.16	16.61	±	2.01^b	12.92-20.59	3.86	±	0.83^ab	2.98-5.60	4.61	±	0.52	3.65-5.77
93.9 m/min
6-9y	10	0.85	±	0.17^a	0.67-1.26	28.01	±	4.59^a	23.19-36.26	3.43	±	0.72^a	2.46-4.79	5.26	±	0.57	4.52-6.10
10-12y	20	1.12	±	0.22^ab	0.82-1.71	24.37	±	3.61^ab	18.76-32.37	4.41	±	0.94^ab	3.13-6.43	5.73	±	0.72	4.77-7.85
13-15y	21	1.37	±	0.33^b	0.94-2.29	20.50	±	2.75^b	15.58-24.47	5.03	±	0.85^b	3.26-6.39	5.69	±	0.70	4.13-6.83
16-18y	20	1.31	±	0.36^b	0.85-2.71	20.40	±	2.62^b	15.36-25.22	4.71	±	0.99^ab	3.46-6.87	5.66	±	0.68	4.66-7.01
107.3 m/min
6-9y	4	1.00	±	0.19	0.75-1.16	32.06	±	7.49	26.16-43.03	3.99	±	0.64	3.40-4.88	6.11	±	1.01	5.05-7.47
10-12y	12	1.37	±	0.30	1.03-2.13	28.61	±	3.04	24.06-35.07	5.37	±	1.38	3.61-7.83	6.84	±	0.69	6.09-7.89
13-15y	19	1.61	±	0.40	1.17-2.81	24.41	±	3.96	17.21-32.74	5.95	±	1.01	4.04-7.85	6.73	±	0.83	5.33-8.59
16-18y	16	1.60	±	0.53	1.07-3.46	24.89	±	3.72	18.56-32.33	5.58	±	1.23	4.19-8.75	6.84	±	0.98	5.54-9.16
120.7 m/min
6-9y	0		-		-		-		-		-				-		-
10-12y	2	1.39	±	0.03	1.37-1.41	29.74	±	1.25	28.85-30.62	5.79	±	0.49	5.44-6.14	7.16	±	0.52	6.80-7.52
13-15y	6	2.26	±	0.63	1.75-3.33	32.17	±	2.93	28.60-35.49	7.43	±	1.34	5.44-9.31	8.43	±	0.91	7.50-9.92
16-18y	6	1.70	±	0.28	1.25-1.98	26.28	±	1.14	24.74-28.05	6.31	±	1.22	5.10-8.24	7.65	±	0.37	7.18-8.23

Notes. Values presented as M ± SD. MET_y1 = youth metabolic equivalents calculated as mass-specific VO₂ divided by measured resting mass-specific VO₂. MET_y2 = youth metabolic equivalents calculated as mass-specific VO₂ divided by estimated resting mass-specific VO₂ (using the Schofield equation). Estimated mean resting mass-specific VO₂ values for 6-9, 10-12, 13-15, and 16-18 year-olds were 5.19 ± 0.67, 4.20 ± 0.51, 3.60 ± 0.44, and 3.53 ± 0.43 ml/kg/min, respectively. Mean values with different superscript letters within each treadmill speed are significantly different at p < 0.001.

^†

Sample size is reduced by 1 participant for MET_y1 data due to missing measured resting VO₂.