2007, Piran, Slovenia

Environmental Ergonomics XII
Igor B. Mekjavic, Stelios N. Kounalakis & Nigel A.S. Taylor (Eds.), © BIOMED, Ljubljana 2007
Figure 3. Mean heart rate data for subjects across the three wave conditions (N=19).
Figure 4. Mean CO2 production for the 3 wave conditions, 3SEM included (N=20).
DISCUSSION
Given there was a significant increase in VCO2 in the perpendicular compared to
resting condition we reject our null hypothesis. However, it is clear that the increases
in mean carbon dioxide production with motion in the present investigation were
small (0.055-0.09 L.min -1 ) and therefore the data from this study supports the
assumption of a 200W metabolic rate and consequent 487mL.min -1 per diver of
carbon dioxide production (8,415L in 24h) is sufficient for a HES, if the motion
profiles outlined approximate the condition likely to occur over a 24hr period and the
subjects recruited are a representative sample, both of which are believed to be true.
72
Heart Rate (b.min-1)
100
95
90
85
80
75
70
65
60
55
VCO 2 (L.min -1 ) 50
0 5 10 15 20 25
0.500
0.450
0.400
0.350
0.300
0.250
0.200
0.150
0.100
0.050
0.000
Rest Longitudinal waves Perpendicular waves
Time (min)
Rest Longitudinal Waves Perpendicular Waves