Table 2. Estimation of Peak Oxygen Consumption Using the Incremental Shuttle Walk Test

Author	Subjects	VO²peak or max (mL/kg/min)	ISWD (m)	Regression equation to predict oxygen consumption	Model performance
Author	Subjects	VO²peak or max (mL/kg/min)	ISWD (m)	Regression equation to predict oxygen consumption	r	r²	SEE
Singh et al. (1994) [59]	COPD (n = 19)	14.2 ± 4.1	375 ± 137	4.19 + 0.025 × ISWD (m)	0.88	0.77
Morales et al. (1999) [60]	Chronic heart failure (n = 46)	17.8 ± 4.4	503 ± 150	5.9 + 0.023 × ISWD (m)	0.83	0.69	2.55
Morales et al. (1999) [60]	Chronic heart failure (n = 46)	17.8 ± 4.4	503 ± 150	0.024 × ISWD (m) – 0.06 × weight + 0.06 × age + 6.44	0.86	0.74	2.37
Lewis et al. (2001) [61]	Cardiomyopathy before transplant (n = 25)	15.2 ± 4.4	401 ± 147	6.4 + 0.022 × ISWD (m)	0.73	0.53
Satake et al. (2003) [62]	COPD (n = 12)	13.86 ± 3.62	360.8 ± 155.5	8.0 + 0.02 × ISWD (m)	0.85	0.72
Turner et al. (2004) [63]	COPD (n = 20)	14.2 ± 2.9	339.0 ± 97.2	6.82 + 0.02 × ISWD (m)	0.73	0.53
Fowler et al. (2005) [64]	CABG (n = 39)	21.0 ± 4.5	487 ± 147.6	7.81 + 0.03 × ISWD (m)	0.86	0.74
Struthers et al. (2008) [65]	General surgical setting (n = 50)	18.7 ± 5.1	284 ± 207	13.43 + 0.02 × ISWD (m)	0.75	0.57
Mandic et al. (2013) [53]	Stable CAD (72.3 ± 6.2)	19.8 ± 5.1	Peak speed 6.5 ± 1.8 km/h	3.021 × shuttle speed (km/h) × 0.007	0.717	0.514	3.59
Mandic et al. (2013) [53]	Stable CAD (72.3 ± 6.2)	19.8 ± 5.1	Peak speed 6.5 ± 1.8 km/h	1.546 × shuttle speed (km/h) - 0.219 × body fat (%) + 0.296 × 30-second chair stands (n) + 11.399	0.853	0.728	2.76
Lima et al. (2019) [66]	Healthy woman	30.35 ± 4.81	821.1 ± 118.9	19.793 + 0.02 x ISWD (m) - 0.236 x age	0.51	0.363

VO²: oxygen consumption, ISWD: incremental shuttle walk distance, SEE: standard error of estimate, COPD: chronic obstructive pulmonary disease, CABG: coronary artery bypass graft, CAD: coronary artery disease