TABLE 2.

Paired Comparisons Between SPECT Data Recorded in Biker Position and in Either Sitting (n = 40) or Supine (n = 40) Position

Parameter	Biker	Sitting	P	Biker	Supine	P
Longitudinal motion score	1.3 ± 0.6	1.3 ± 0.9	NS	1.6 ± 0.8	2.5 ± 1.6	<0.001
Heart–to–camera-head distance (cm)	18.3 ± 2.3	20.1 ± 2.4	<0.001	18.3 ± 1.6	20.2 ± 2.5	<0.001
Count sensitivity (counts/min/MBq)	586 ± 170	600 ± 173	NS	557 ± 152	609 ± 171	0.001
Defect extent (mean number of segments)
Ischemic pattern	1.58 ± 2.31	1.35 ± 2.23	NS	1.0 ± 1.7	1.2 ± 1.5	NS
Infarction pattern	1.38 ± 2.62	1.40 ± 2.28	NS	0.9 ± 2.0	0.6 ± 1.3	NS
Attenuation artifact pattern	0.75 ± 0.93	1.38 ± 1.60	0.011	1.10 ± 1.00	1.90 ± 1.74	0.010
Inferior attenuation area*	0.70 ± 0.91	1.28 ± 1.43	0.006	0.93 ± 0.94	1.52 ± 1.58	0.046
Anterior and apical attenuation area†	0.05 ± 0.22	0.10 ± 0.30	NS	0.18 ± 0.38	0.38 ± 0.70	0.083

^*Corresponding to segments belonging to inferior attenuation area described at bottom of Figure 2.

^†Corresponding to segments belonging to anterior and apical attenuation area described at bottom of Figure 2.

NS = nonsignificant with P > 0.10. Data are mean ± SD.