Blood Lactate Threshold Differences Between Arterialized and Venous Blood

Robergs, Robert A.; Chwalbińska-Moneta, J; Mitchell, Jermaine B.; Pascoe, David D.; Houmard, Joseph A.; Costill, David L.

doi:10.1055/s-2007-1024835

Cited by 37 publications

(12 citation statements)

References 14 publications

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“…The LT 4 is highly infl uenced by the levels of lactate, which can vary widely and can be induced by many factors, including nutrition, prior stress and muscle fi ber distribution [5,20] . In addition, the site (e. g., earlobe and fi ngertip) as well as the method (e. g., venous, arterial and capillary) of blood sampling may also aff ect the test result [9,10,11,19] . The Dmax is a robust method in which the most important factor is the lactate-intensity curve shape and not the lactate levels themselves.…”

Section: Discussion ▼mentioning

confidence: 99%

The Dmax is Highly Related to Performance in Middle-Aged Females

Machado¹,

Moraes²,

Peserico³

et al. 2011

Int J Sports Med

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The present study examined whether the running speed at the lactate threshold estimated by the maximal deviation method (LT (Dmax)) is highly correlated and in agreement with 10-km road race performance (S (10 km)) in middle-aged female runners. Additionally, the LT (Dmax) was compared with the visual detection of the inflection point (LT (Visual)), the fixed lactate level of 4 mmol.L (-1) (LT (4)) and the peak speed (S (peak)) in relation to performance. Sixteen middle-aged, recreational female runners performed a discontinuous, incremental treadmill test. The initial speed was set at 7 km.h (-1), and this speed was increased every 3 min by 1 km.h (-1) with a 30-s rest between the stages used for earlobe capillary blood sample collection. All of the participants took part in the same local 10-km road race, and S (10 km) mean speed was calculated. The speeds (mean ± SD) were 10.5 ± 1.0 (S (10 km)), 10.5 ± 1.0 (LT (Visual)), 10.9 ± 0.9 (LT (Dmax)), 11.4 ± 1.3 (LT (4)) and 13.5 ± 1.1 km.h (-1) (S (peak)). The LT (Dmax) had the narrowest limits of agreement (0.3 ± 0.4 km.h (-1)) and was the most highly correlated with the S (10 km) ( R=0.98), followed by the S (peak) ( R=0.95), LT (4) ( R=0.85) and LT (Visual) ( R=0.81). In conclusion, the LT (Dmax) should be more widely used to estimate long-distance performance and to verify improvements in training.

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Section: Discussion ▼mentioning

confidence: 99%

The Dmax is Highly Related to Performance in Middle-Aged Females

Machado¹,

Moraes²,

Peserico³

et al. 2011

Int J Sports Med

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“…The above computing procedures were performed by a designed computer program. Repeated measures ANOVA and Pearson correlation analyses were used to assess the differences and the relationships between the thresholds determined by the Dmax method in each test according to plasma lactate (Dmax-La), Ve (Dmax-Ve), Bf (Dmax-Bf), VCO2 (Dmax-'c/C02), linear regression method (Lin-Eq02; according to Eq02 [12] and Lin-Vslope; according to the slope of VCO2 [3]), and OBLA (at venous blood 2.8 mmol/l [15]). Paired t-tests were used to assess the differences between the two tests.…”

Section: Mathematical and Statistical Methodsmentioning

confidence: 99%

A New Approach for the Determination of Ventilatory and Lactate Thresholds

Cheng¹,

Kuipers²,

Snyder³

et al. 1992

Int J Sports Med

300

223

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In order to determine the ventilatory threshold (VT) and the lactate threshold (LT) in a reliable way, a new method is proposed and compared with conventional methods. The new method consists of calculating the point that yields the maximal distance from a curve representing ventilatory and metabolic variables as a function of oxygen uptake (VO2) to the line formed by the two end points of the curve (Dmax method). Male cyclists (n = 8) performed two incremental exercise tests a week apart. Ventilatory/metabolic variables were measured and blood was sampled for later lactate measurement during each workload and immediately after exercise. No statistical differences were observed in the threshold values (expressed as absolute oxygen uptake; VO2) determined by the Dmax method and the conventional linear regression method (according to O2 equivalent; EqO2) and venous blood at the onset of blood lactate (OBLA), while VT assessed with the conventional linear method (according to the slope of CO2 output; Vslope) yielded significantly lower threshold values. Similar results were obtained from the reproducibility test. Thus, the Dmax method appears to be an objective and reliable method for threshold determination, which can be applied to various ventilatory or metabolic variables yet yield similar results. The results also showed that breathing frequency can be used to determine VT.

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“…Venous blood samples for [La A ] b determinations were taken after each exercise intensity, and LT was calculated using the two-segmental linear regression (log [La A ] b vs log exercise intensity) according to Beaver et al (1985). As has been reported by Robergs et al (1990) there is no signi®cant dierence between LT detected by this method based on [La A ] in venous and arterialized blood, despite the diering absolute [La A ] between the two blood compartments.…”

Section: Protocolmentioning

confidence: 96%

Psychomotor performance during prolonged exercise above and below the blood lactate threshold

Chmura¹,

Krysztofiak

Ziemba

et al. 1997

European Journal of Applied Physiology and Occupational Physiol

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Previous investigations from this laboratory have demonstrated that during graded exercise with exercise intensities increasing every 3 min until exhaustion the multiple choice reaction time (RT) decreased until the intensity exceeded the lactate threshold (LT) by approximately 25%, and then rapidly increased. The aim of this study was to follow up changes in RT during prolonged exercise at constant intensities above and below LT and to relate these changes to changes in venous blood lactate [La-]b, and plasma catecholamine [CA]pl concentration responses to the exercise. For this purpose eight young soccer players exercised for 20-min on a cycle ergometer at 10% above LT, and nine exercised for 60 min at an intensity 30% below LT. During both tests RT, heart rate (HR), as well as [La-]b, and [CA]pl were measured. Above LT, RT decreased from the 5th min until the end of exercise, whilst HR, [La-]b, and [CA]pl increased progressively. Significant inverse correlations were ascertained between RT and plasma adrenaline (r = -0.651) and noradrenaline concentrations (r = -0.678). During exercise below LT, RT decreased up to approximately 40 min, then it reached a nadir, and stabilized at this level. This was accompanied by only small changes in [La-]b and [CA]pl. The present findings would indicate that young athletes are able to maintain for a relatively long time, or even increase, their psychomotor performance during endurance exercise both below and above the LT.

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Blood Lactate Threshold Differences Between Arterialized and Venous Blood

Cited by 37 publications

References 14 publications

The Dmax is Highly Related to Performance in Middle-Aged Females

The Dmax is Highly Related to Performance in Middle-Aged Females

A New Approach for the Determination of Ventilatory and Lactate Thresholds

Psychomotor performance during prolonged exercise above and below the blood lactate threshold

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