Reference Equations for the Six-Minute Walk Distance in the Healthy Chinese Han Population, Aged 18–30 Years

BMC Pulmonary Medicine

Table 2 6MWT results for the study subjects

Characteristic	Females (n = 176)	Males (n = 179)	p-value*	Total (n = 355)
Activity	624.9 ± 49.01	659.2 ± 43.02	<0.001	646.1 ± 48.27
Non-activity	597.9 ± 49.72	631.3 ± 47.79	<0.001	611.6 ± 51.52
Resting HR, bpm	76.2 ± 7.28	73.6 ± 8.38	0.002	74.9 ± 7.95
Resting SpO₂, %	98.7 ± 0.97	97.9 ± 1.06	<0.001	98.4 ± 1.08
Resting SBP, mmHg	110.8 ± 8.51	114.2 ± 6.77	<0.001	112.5 ± 7.86
Resting DBP, mmHg	71.4 ± 8.27	72.0 ± 6.88	NS	71.7 ± 7.60
6MWD₁, m	586.8 ± 50.85	627.8 ± 46.26	<0.001	607.5 ± 52.69
6MWD₂, m	601.3 ± 51.63	639.2 ± 48.87	<0.001	620.4 ± 53.67
Best 6MWD, m	607.4 ± 51.00	646.9 ± 47.15	<0.001	627.3 ± 52.88
Borg after the 6MWT	0.23 ± 0.43	0.22 ± 0.44	NS	0.22 ± 0.44
HR after the 6MWT, bpm	118.7 ± 22.45	112.8 ± 24.06	0.017	115.7 ± 23.43
% mHR after the 6MWT	60.5 ± 11.13	57.5 ± 12.0	0.015	59.0 ± 11.64
Difference in HR, bpm	42.5 ± 21.52	39.2 ± 22.71	NS	40.8 ± 22.16
SpO₂ after the 6MWT, %	98.3 ± 1.01	97.6 ± 1.13	<0.001	98.0 ± 1.10
Change in SpO₂, %	−0.43 ± 0.66	−0.35 ± 0.73	NS	−0.38 ± 0.71
SBP after the 6MWT, mmHg	125.6 ± 10.22	133.3 ± 12.33	<0.001	129.5 ± 11.97
DBP after the 6MWT, mmHg	79.6 ± 7.34	81.7 ± 8.60	0.011	80.7 ± 8.06

Values are expressed as the mean ± SD
6MWT Six-minute walking test, 6MWD Six-minute walking distance, HR Heart rate, SpO ₂ Oxygen saturation
%mHR Percentage of the predicted maximum heart rate, SBP Systolic blood pressure, DBP Diastolic blood pressure
*p-value between males and females

ISSN: 1471-2466