title: The effects of strength training and centrifuge exposure on +Gz tolerance.
abstract: Weight training (WT) as a countermeasure to +Gz intolerance seems to be an accepted modality, but lacks convincing support in the research literature. This study examines factors associated with WT in an operational environment as a countermeasure to +Gz intolerance. Fourteen naval aviators were assigned to a WT group (n = 7) and a non-weight-trained control (NWT) group (n = 7). All subjects were tested before and after a 10-week training period for aerobic capacity (VO2max), dynamic muscular strength (Cybex II), body fat, gradual onset rate (GOR) for +Gz at a rate of +1 G.15 s-1, and finally a simulated air combat maneuver (SACM) consisting of 15 s at +4.5 Gz and +7 Gz alternating challenges to exhaustion. The results indicate the following: 1) no significant differences in any of the centrifuge variables measured between WT and NWT groups while both groups showed a time or learning effect in SACM from 175 +/- 109 to 239 +/- 110 s (grouped data df = 16, t = 2.97, p < 0.09); 2) no improvement in SACM time for subjects achieving a 300-s SACM pretest value (n = 4); and 3) for SACM times below 300 s, the WT subjects showed a greater improvement than NWT subjects (n = 11, F = 9.12, p < 0.02). The data suggest that although some subjects showed considerable strength gains, WT in a naval aviation operational setting may not provide a universal desired effect.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Naval Aerospace Medical Research Laboratory, Pensacola, FL.
authors.forename: R
authors.initials: R
authors.lastname: Bulbulian
authors.forename: R P
authors.initials: RP
authors.lastname: Crisman
authors.forename: M L
authors.initials: ML
authors.lastname: Thomas
authors.forename: L G
authors.initials: LG
authors.lastname: Meyer
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D000337:Aerospace Medicine; D000704:Analysis of Variance; D002498:Centrifugation; D005240:Feasibility Studies; D006112:Gravitation; D006801:Humans; D009132:Muscles / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D012107:Research Design; D014891:Weight Lifting / Q000502:physiology*