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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Ward T. E. 1, Hart C. L. 2, McKeown B. C. 2, Kras J. 3
1 Department of Health and Physical Education, Texas A&M University-Commerce, Commerce, Texas, USA;
2 Department of Health Exercise and Sport Studies, University of Texas at Arlington, Arlington, USA;
3 Department of Health, Physical Education and Dance, Utah State University, Logan, UT, USA
Objective. To investigate heart rate (HR) and relative oxygen consumption (V.O2) measures during two modes (walking or running stage four) of the Bruce treadmill protocol.
Participants. Male volunteers (n=27), ranging in age from 25 to 56 years (M=39.1±10.7 yrs).
Experimental design. S’s performed to volitional fatigue on the two randomly assigned treadmill tests.
Measures. HR and V.O2 were taken each minute and at point of exhaustion.
Results. Dependent “t”-tests revealed a significant (p≤0.05) difference between the protocols at 11 minutes (running= 46.7±3.9 > walking=44.6±3.7 ml[kg.min-1]) and at 12 minutes (running=49.3±4.1 > walking=47.6±3.5 ml[kg.min-1]) on the V.O2 values. A significant differences was noted on HR at 11 minutes (running=158.1±13.5 > walking=156.0±13.0 bpm) and at 12 minutes (running=160.4±11.0 > walking=157.8±11.4 bpm) between the protocols. The two-way ANOVA technique revealed no significant differences or interactions on V.O2 or HR between younger (<45 yrs) and older (≥45 yrs) subjects during either protocol. A one-way ANCOVA indicated no significant differences between taller and shorter subjects on V.O2 during the fourth stage of the Bruce protocol. The correlations, between the two protocols, for HR were strong but were weaker and inconsistent for V.O2. The repeated measures ANOVA indicated significant within subject variability between test administrations.
Conclusions. When testing endurance trained males, modality, age and height are not factors in differences of V.O2 values during the 4th stage of the Bruce treadmill test but learning effect could be.