title: Step testing as an assessment of physical fitness on Polaris submarines.
authors.forename: J
authors.initials: J
authors.lastname: Berth-Jones
authors.forename: D J
authors.initials: DJ
authors.lastname: Smith
mesh_terms: D000293:Adolescent; D000328:Adult; D015444:Exercise; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008889:Military Personnel; D010101:Oxygen Consumption; D010809:Physical Fitness; D013366:Submarine Medicine