The comparison of protocol design for the purpose of eliciting peak physiological
Cardiff Metropolitan University
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The aim of this research was to establish whether using a single protocol for testing metabolic thresholds and peak physiological responses does in fact invalidate the data produced for these physiological parameters. The study presents data comparing peak physiological responses including; oxygen consumption (VO2peak), carbon dioxide production (VCO2peak), power output [PO (W)], Wpeak (W), respiratory exchange ratio (RERpeak), heart rate (HRpeak), breath frequency (BFpeak), ventilation (VEpeak) and central and peripheral rating of perceived exertion (RPE), between two incremental protocols of 1-minute and 3-minute stage duration. These parameters at ventilatory threshold 1 (VT1) and ventilatory threshold 2 (VT2)/ respiratory compensation point (RCP) were also reported during both protocols. Seven moderately active collegiate males took part in the research [mean (±SD) height 182 (6.3) cm, weight 90 (15.4) kg and age 20 (1) yrs]. The participants completed three arm crank ergometry (ACE) protocols, initially a familiarisation test to determine VO2peak, and create relative working intensity’s during the latter two incremental tests. Both incremental protocols began at an intensity of 20% of the Wpeak established via the familiarisation protocol with 10% increments every 1 or 3 minutes dependant on protocol. Breath-by-breath analysis via computer system was used to analyse inspired and expired gases. Results reported test time(s) was highest during the 3- min protocol compared to the 1-min protocol [1689 (85) vs 928 (31), P<0.05], however the 1-min protocol produced the highest Wpeak (W) [173 (34) vs 144 (31), P<0.05] and RERpeak compared to the 3-min protocol [1.22 (0.07) vs 1.13 (0.04), P<0.05]. Analysis also reported that VT2 occurred at a significantly lower absolute PO during the 3-min protocol when compared to the 1-min [113 (19), 124 (22), P<0.05]. However VT2 occurred at a significantly higher relative PO (% of Wpeak) during the 3-min protocol when compared to the 1-min protocol [80 (7), 72 (4), P<0.05]. Nevertheless, no significant difference (P>0.05) was stated for VO2, relative VO2, HR or relative HR at the same breakpoint defined as VT2. It was unfeasible to determine VT1 during the 3-minute protocol via the V-slope method. Data from the research suggested that it is possible to test peak physiological responses, VT1 and VT2 during a single 1-minute incremental protocol. This finding can be applied to future research and allow simultaneous calculation of peak physiological responses and metabolic thresholds using a single incremental protocol.
DEGREE OF BACHELOR OF SCIENCE (HONOURS) SPORT AND EXERCISE SCIENCE
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