Table 1. Respiratory exchange ratio (RER) and heart rate (HR) responses due to loading and vibratory conditions. Data are means (SD). 0%-50H 0%-35L 0%-NV 20%-50H 20%-35L 20%-NV 40%-50H 40%- 35L 40%-NV RER HR RER HR RER HR RER HR RER HR RER HR RER HR RER HR RER HR Resting .85 60.0 .86 61.0 .84 60.5 .86 58.8 .86 62.1 .86 60.4 .85 63.3 .83 59.1 .84 59.9 (.03) (8.3) (.05) (8.4) (.04) (8.3) (.05) (8.1) (.05) (5.2) (.06) (6.4) (.03) (8.1) (.04) (8.5) (.05) (9.4) Exercise .84 76.3 .84 77.3 .83 77.6 .85 80.7 .85 73.9 .84 77.8 .86 92.3 .85 88.9 .84 76.1 (.04) (7.4) (.05) (7.8) (.05) (9.5) (.06) (8.9) (.05) (25.6) (.03) (5.8) (.06) (8.6) (.05) (9.8) (.05) (25.5) Recovery .88 63.0 .88 63.9 .87 63.6 .89 63.5 .90 66.9 .90 63.4 .91 68.5 .90 65.4 .90 64.1 (.05) (9.4) (.07) (9.0) (.05) (10.0) (.05) (7.5) (.06) (6.5) (.06) (6.3) (.07) (8.8) (.03) (9.9) (.05) (11.4)