A-22: Free Communication/Poster – Exercise Testing: Children and Adolescents, Gadgets: WEDNESDAY, JUNE 1, 2005 9:30 AM - 12:30 PM ROOM: Ryman C1
Blood lactate monitoring is probably the most frequently measured biochemical marker in training and exercise. Advances in biotechnology have made it possible to measure blood lactate concentration via relatively inexpensive and portable handheld lactate analyzers.
To compare blood lactate values obtained from three different lactate analyzers (Lactate-Pro, Lactate-Scout, and Accutrend Lactate) with values measured via wet-chemistry YSI 1500 Lactate Analyzer.
Ten trained male volunteer subjects (age: 30.7±6.5; Ht 68.3±4.0; Wt 73.8±5.8;%fat 11.7±3.5; VO2max 59.3±9.3) participated in this study. Each subject completed a single maximal oxygen consumption exercise (VO2max) test on an electronically braked cycle ergometer. The test started at 40 Watts (W) at 70 rpm and increased by 30 W every 2 min until voluntary exhaustion. Blood samples for lactate analysis (LA) were collected at rest, during the last 10s of each increment, at peak, and at 3 min of recovery from finger stick venopuncture.
Statistical analysis revealed significant difference between Accutrend Lactate and YSI 1500 at 240 W and for Lactate Scout at 270 W and all subsequent stages (p < 0.05). All instruments measured LA slightly above YSI 1500 at rest and lower stages of exercise; however, these differences were not significant. At higher LA concentrations (above 9.0 mmol.l−1), all instruments measured LA below values measured by YSI 1500. Lactate-Pro LA values were not significantly different from YSI 1500.
This study suggest that all three handheld lactate analyzers measured LA concentration very similarly and may be used for assessing lactate accumulation, lactate threshold, and lactate turn points in training or exercise. Higher LA concentrations obtained from Accutrend Lactate and Lactate Scout may somewhat underestimate LA accumulation and should be interpreted with caution.