Table 4.
Aerobic fitness metrics
| Fitness category | Fitness sub-category | Fitness metric | Thresholds | Associations/ relationship to performance outcomes |
|---|---|---|---|---|
| Aerobic fitness | Maximal aerobic capacity (VO2peak or VO2max) | Cycle VO2peak (mL/kg/min) | Egress: <20 to 27.5 (Alexander et al.31; Ryder et al.34) | Not associated with egress (Alexander et al.31) |
| Ambulation/transfer: 27.4 (Ryder et al.31) | ||||
| Crew rescue: 27.41 (Ryder et al.31) | ||||
| Hill climb (low and moderate intensity): 26 and 30.5 (100% sensitivity; Sutterfield et al.35); | ||||
| Surface traverse (low and moderate intensity): 26 and 40 (100% sensitivity; Sutterfield et al.35) | ||||
| Rowing VO2peak (mL/kg/min) | Not reported | Not associated with egress (Alexander et al.31) | ||
| Treadmill VO2max (mL/kg/min) | Task circuit (Martian intensity; 50% probability of completion): 38.4 (Ade et al.30) | EVA task circuit: r = −0.43 to −0.74 (Ade et al.28,29) | ||
| Task circuit (Martian intensity; 75% probability of completion): 40.0 (Ade et al.30) | 10 km walkback: r = −0.64 (Ade et al.28) | |||
| Arm crank VO2max (mL/kg/min) | Not reported | EVA task circuit: r = −0.42 to −0.66 (Ade et al.28,29) | ||
| Gas exchange threshold (GET) | Treadmill GET | Not reported | EVA task circuit: r = −0.45 to −0.58 (Ade et al.28,29) | |
| 10 km walkback: r = −0.48 (Ade et al.28) | ||||
| Arm crank GET | Not reported | EVA task circuit: r = −0.34 to −0.51 (Ade et al.28,29) | ||
| Cycle GET (mL/kg/min) | Surface traverse (low and moderate intensity):16 and 28.8 (100% sensitivity; Sutterfield et al.35) | Not reported | ||
| Hill Climb (low and moderate intensity): 14.8 and 18.7 (100% sensitivity; Sutterfield et al.35) | ||||
| Aerobic peak power (PPO) | Cycle PPO (W) | Surface traverse (low and moderate intensity):188 and 238 (100% sensitivity; Sutterfield et al.35) | Not associated with egress (Alexander et al.31) | |
| Hill Climb (low and moderate intensity): 188 (100% sensitivity; Sutterfield et al.35) | ||||
| Rowing PPO (W) | Surface traverse (low and moderate intensity):188 and 262 (100% sensitivity; Sutterfield et al.35) | Associated with egress (r = −0.60) (Alexander et al.31) | ||
| Hill Climb (low and moderate intensity): 188 (100% sensitivity; Sutterfield et al.35) | ||||
| Arm crank PPO | Not reported | EVA task circuit: r = −0.35 to −0.56 (Ade et al.28,29) | ||
| Critical power (CP) | Rowing CP (W) | Surface traverse (low and moderate intensity): 99.7 and 170 (100% sensitivity; Sutterfield et al.35) | Not associated with egress (Alexander et al.31) | |
| Hill climb (low and moderate intensity):124 and 123 (100% sensitivity; Sutterfield et al.35) | ||||
| Arm Crank CP (W) | CP > 70.5 low risk of time in the lowest performance quartile (Ade et al.29) | EVA task circuit: r = −0.61 to −0.70 (Ade et al.28,29) | ||
| CP ≤ 39.8 high risk of time in the lowest performance quartile (Ade et al.29) | ||||
| Critical speed (CS) | Treadmill CS | Not reported | EVA task circuit: r = −0.56 to −0.82 (Ade et al.28,29) | |
| 10 km walkback: r = −0.85 (Ade et al.28) |
Thresholds were identified as specific values determined through regression or receiver operator curves as being related to task performance.
Relationships were reported as r, r2, or Somers’ D values. VO2peak peak aerobic capacity, VO2max maximal aerobic capacity, EVA extravehicular activity, GET gas exchange threshold, PPO peak power output, CP critical power, CS critical speed.