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Blood lactate reduction at three recovery intensities following severe rowing excercise

University of British Columbia

The purpose of this study was to observe the differences in rates of blood lactate reduction (BLR) at three recovery intensities (40% VO₂max, 60% V02max, and combined recovery ) when subjects are highly trained and aerobically fit. Eight well-trained oarsmen (age = 23.2 yr, Ht = 189.6 cm, Wt = 85.3 kg, VO₂max = 5.2 1 / min or 61.6 ml / kg min⁻¹) were tested in one pre-experimental procedure and three experimental treatments. The pre-experimental procedure involved the determination of VO₂max, and the loads at which 40 -, 50 -, and 60% VO₂max occurred from a progressive load VO₂max. The three experimental treatments each involved three one minute maximal load intervals on the rowing ergometer to elevate blood lactate, followed by a 30 minute randomly assigned recovery on the rowing ergometer at either 40% VO₂max (40R), 60% VO₂max (60R), or combined recovery (CR). Blood samples, from an indwelling catheter placed in the cephalic vein, were taken at t=0,1, 2, 3, 4, 5, 6, 9,12,15,18, 21, 24, 27, and 30 min of recovery. Analysis of plasma samples revealed a mean resting blood lactate concentration ( [ Bla ] ) of 1.2 mM and a mean peak [ Bla ] following maximal exercise of 16.3 mM. ANOVA indicated that no significant differences occurred between the rates of lactate reduction for the three treatments (p<.055). With p<.055 and an effect size of eta=.31, further testing using a post-hoc multicomparison analysis revealed a significantly faster (p<.05) rate of BLR during the 60R treatment when compared to the rate of BLR for 40R. No further differences were revealed between any of the other comparisons (40R vs CR, or 60R vs CR). The significant differences between the rate of BLR for 60R compared to 40R may be due to the subjects' high aerobic fitness, the specific nature of both their training and the recovery task, and physiological adaptations related to a high fitness level.

Text

2010-07-12

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http://hdl.handle.net/2429/26348

Physical Education

University of British Columbia

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