Does the Gas Exchange Anaerobic Threshold Occur at a Fixed Blood Lactate Concentration of 2 or 4 m<i>M</i>?

Ja, Davis; Vj, Caiozzo; Lamarra, N.; Jf, Ellis; Vandagriff, R.; Ca, Prietto; Wc, McMaster

doi:10.1055/s-2008-1026018

Cited by 44 publications

(29 citation statements)

References 6 publications

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“…It has, however, also been reported that some athletes never reach 4 mmol.l-1 blood lactate concentration and it has been proposed that 2 mmol.1-1 might be a more appropriate criterion value for OBLA (Davis et al, 1983). However, this has not been related to practical training levels.…”

Section: Resultsmentioning

confidence: 99%

An holistic approach to recovery from an overuse injury in a games player.

Nimmo¹,

McLean²,

Mutrie

et al. 1986

Br J Sports Med

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The management of a chronic injury to an international squash player is described. By good physiotherapeutic management and the involvement of an interdisciplinary team it was possible to make gains in the non-playing period. The rehabilitation period included physiological assessment on the basis of which a training programme was devised with target goals set throughout the period. Mental rehearsal of skills was included at all stages. As a result, the player's confidence was maintained and fitness levels improved. The long term prognosis has been good. The model could be applied to any sports injury.

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Section: Resultsmentioning

confidence: 99%

An holistic approach to recovery from an overuse injury in a games player.

Nimmo¹,

McLean²,

Mutrie

et al. 1986

Br J Sports Med

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“…Although such pH differences could have been somewhat minimized by having the exercise load as a constant percentage above the Tvcnl (in stead of 90% of VG,max) [II], there are still likely to be interindividual differences in the observed pH readings [3].…”

Section: Discussionmentioning

confidence: 99%

Role of Lactic Acidosis in the Ventilatory Response to Heavy Exercise

Jeyaranjan

Goode²,

Duffin³

1989

Respiration

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The purpose of this study was to determine the role of lactic acidosis in the ventilatory response to heavy exercise above anaerobic threshold. Seven subjects ingested either NaHCO₃ or CaCO₃ at a dose of 300 mg/kg body weight and ran on a motor-driven treadmill at a work load corresponding to 90% of V_O2max and above anaerobic threshold for a period of 5 min while minute ventilation and Pet_Co were recorded breath by breath. A total of 10 runs, 5 with CaCO₃ and 5 with NaHCO₃ in a randomized and blind order, were done in each subject. Statistical analyses of the effects of the chemicals on minute ventilation during the 15 s between min 4.75 and 5 of exercise showed that the differences in ventilation did not reach statistical significance (p > 0.05) in 5 of the 7 subjects. Venous pH measurements at the end of exercise revealed a significant increase with NaHCO₃ (p « 0.05). It is concluded that lactic acidosis is not an essential determinant of ventilatory response to heavy exercise above anaerobic threshold in the majority of the subjects.

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“…Inspired ventilation was measured by a Parkinson-Cowan dry gas meter (Instrumentation Associates, Inc., New York, NY, USA). The Haldane equation was used to transform inspired ventilation to expired ventilation (Davis et al 1983). A 120-l Tissot spirometer (W. E. Collins, Inc., Braintree, MA, USA) was used to calibrate the dry gas meter.…”

Section: Exercise Testingmentioning

confidence: 99%

Lactate threshold at the same fat-free mass and age is larger in men than women

et al. 2008

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The lactate threshold (LT) represents the onset of a metabolic acidosis during graded exercise testing (GXT). It is typically measured as an oxygen uptake (VO(2)) but then ratio scaled by body mass or VO(2) peak to make comparisons among subjects. Theoretical considerations and empirical evidence suggest that this type of ratio scaling is not valid. A method that allows a dependent variable to be compared between groups at that same value of one or more covariates is analysis of covariance (ANCOVA). Our purpose was to compare the LT, estimated non-invasively by gas exchange (LT(GE)), at the same fat-free mass (FFM) and age in 203 sedentary subjects (102 men) aged 20-70 years. Each subject underwent cycle ergometer GXT with LT(GE) measured by the V-slope method. In model development, we discovered an interaction term between sex and age. As dimensional analysis predicts a log-linear relationship between LT(GE) and FFM, two of the model terms were ln LT(GE) and ln FFM. The ANCOVA model was then as follows: dependent variable = ln LT(GE), fixed factor = sex, covariates = ln FFM, age, and sex x age. Sex made a significant contribution to the model (F = 30.7, P < 0.001). At the mean FFM (56.32 kg) and age (44.01 years) of both sexes combined, the LT(GE) was 29% larger in males (1,307 ml min(-1) versus 1,011 ml min(-1)). The model's interaction term resulted in larger differences at younger ages and smaller differences at older ages. We conclude that LT(GE) at the same FFM and age is larger in sedentary men compared to sedentary women.

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Does the Gas Exchange Anaerobic Threshold Occur at a Fixed Blood Lactate Concentration of 2 or 4 mM?

Cited by 44 publications

References 6 publications

An holistic approach to recovery from an overuse injury in a games player.

An holistic approach to recovery from an overuse injury in a games player.

Role of Lactic Acidosis in the Ventilatory Response to Heavy Exercise

Lactate threshold at the same fat-free mass and age is larger in men than women

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