The purpose of this multi-site prospective study is to assess validity of a new step test called Functional-Incremental Stepping-in-place- Test (F-IST) compared to gold-standard cardiopulmonary exercise testing (CPET) and to physical function and health perception, respectively. The investigators will also assess test-retest reliability of the F-IST. The investigators hypothesize that the F-IST will have high validity and test-retest reliability to be used in field testing environments such as the ICU.
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Modified Bruce Treadmill VO2 Peak
Timeframe: Upon enrollment at baseline (day 0-7)
F-IST VO2 Peak
Timeframe: Upon enrollment at baseline (day 0-7)
F-IST VO2 Peak Reliability
Timeframe: Approximately 1-2 weeks following baseline (day 14-21)