Comparison of Blood Lactate Concentrations Obtained During Incremental and Constant Intensity Exercise

Foxdal, P; Sjödin, Anders; Sjödin, B.

doi:10.1055/s-2007-972861

Cited by 48 publications

(51 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Collectively, the present studies provide a significant contribution to a limited body of recommendation for accurately determining LT2 is consistent with others [16,283,284] , and supported by the results of this thesis that show LT2 elicited a V O2, heart rate, [La -] and (albeit inconsistently) power output that was similar 279 to those elicited during 40 km cycling time trials. Thus, its validity for establishing a performance intensity was confirmed.…”

Section: Practical Implicationssupporting

confidence: 89%

“…The study of Bishop et al [10] reported stage durations of 3 min, 162 however it has been concluded that stages shorter than 5 min may over-predict LT2. and therefore an accurate determination of LT2 [282][283][284] . The study of Fell [18] reported a larger variation in LT2 power output (260 ± 42 W) than the present study (238 ± 28 W), and larger variation is known to result in stronger relationships with endurance performance [1] .…”

Section: Correlations With 40 Km Time Trial Performancementioning

confidence: 99%

See 1 more Smart Citation

Sex differences and training adaptations in relation to the lactate threshold and endurance exercise performance

Fisher¹

View full text Add to dashboard Cite

The second lactate threshold (LT2) has long been associated with endurance performance in trained endurance athletes. In Australia, the state institutes and academies of sport utilise the modified maximum deviation (D-max) method to determine LT2 in endurance athletes for the purpose of establishing training intensities and indicating whether athletes are appropriately adapting to training loads. For LT2 methods to be considered valid, it had been suggested that strong associations with simulated endurance performance and the maximal lactate steady-state (MLSS) are required. Although research has established a strong relationship between the modified D-max and endurance performance, there are gaps in the literature which this thesis aims to investigate. iii appropriate measurement of ovarian hormones. Therefore, the second study extended study one, to explore the same experimental aims, in endurance-trained women (n = 12) whilst controlling for ovarian hormone concentrations through the use of hormonal contraceptives. When comparing to the men's results from study one, power output and V O2 at LT2 were also found to be significantly correlated with 40 km cycling performance in endurance-trained women. Additionally, combining maximal (peak power output and V O2max) and fractional utilisation (V O2 and power output at LT2) variables produced the strongest prediction of performance in women (r 2 = 0.87) and men (r 2 = 0.95). In women, VT2 was significantly higher than LT2 for all variables measured, despite no differences observed for the men. More women (73%) than men (50%) completed 30 min of cycling and elicited a steady-state [La -] at their LT2 power output, despite LT2 being significantly higher than the self-selected power output during a 40 km cycling time trial in women.The final study examined the sensitivity of the modified D-max LT2 to adapt to a brief highintensity interval training (HIIT) intervention in already-endurance trained men (n = 9) and women (n = 8). Although not significant, women (but not men) showed a trend towards LT2 power output improvement (2.2%; p = 0.08) post-HIIT. Mean 40 km time trial performance significantly improved in both men (-1.7%) and women (-2.6%), with no difference in the magnitude of change between sexes. Furthermore, although LT2 power output explained 77% of the improvement in 40 km cycling performance in women, none of the measured variables explained the performance improvement in men, suggesting that mechanisms other than those responsible for the LT2 were involved. The LT2-performance relationship was intensity-dependent in both men and women, shown by significant correlations at post-HIIT but not baseline. Some of the sex-related differences may, at least in part, be explained by the influence of oestradiol, perhaps by the exacerbation of the sex-based differences in substrate metabolism and subsequent effects on [La -] and fatigue, and/or greater cardiovascular stress in men than women.Collectively, these studies improve understanding of the modifie...

show abstract

Section: Practical Implicationssupporting

confidence: 89%

Section: Correlations With 40 Km Time Trial Performancementioning

confidence: 99%

Sex differences and training adaptations in relation to the lactate threshold and endurance exercise performance

Fisher¹

View full text Add to dashboard Cite

show abstract

“…Níveis elevados de lactato no sangue são evidentes após o exercício de resistência de alta intensidade 8 . O lactato do sangue normalmente retorna aos níveis de repouso aproximadamente uma hora após o término do exercício 8 . A força tem-se mostrado reduzida até quatro horas após o término do exercício de resistência 2 .…”

Section: Discussionunclassified

Influência aguda de uma aula de mini-trampolim no agachamento

Lemos

Simão

Miranda³

2007

Fit Per J

View full text Add to dashboard Cite

, 943/103 Jardim Cidade Universitária, João Pessoa/PB CEP: 58052-270 RESUMO -As aulas realizadas no mini-trampolim representam mais uma das opções de treino aeróbico oferecidas nas academias com capacidade de promover melhora no condicionamento físico geral. O treino combinado de aeróbica e força tem gerado muitas discussões sobre o efeito deletério que o primeiro pode produzir no segundo, quando praticado de forma subseqüente. Sendo assim, o objetivo deste estudo foi verificar a influência aguda de uma aula de 40 minutos no mini-trampolim sobre o número de repetições alcançados no agachamento. Participaram 12 mulheres praticantes de ambas as atividades (força e mini-trampolim) há pelo menos seis meses. O estudo envolveu quatro dias de testes com intervalo de 48 horas entre os mesmos. No primeiro dia foi realizado um teste de 10RM no exercício de agachamento. No segundo dia foi realizado um re-teste para verificar a reprodutibilidade das cargas. O terceiro dia envolveu a aula no mini-trampolim e em seguida o exercício de agachamento com as cargas pré-determinadas. No quarto dia, as voluntárias realizaram somente o exercício de agachamento com as cargas obtidas para 10RM. Na análise dos dados foi utilizada ANOVA de duas entradas com medidas repetidas, seguida do teste post-hoc de Tukey (p<0,05). Após os testes realizados, verificou-se que a aula no mini-trampolim provocou significativo decréscimo do número de repetições no exercício agachamento, quando comparado ao desempenho deste exercí-cio sem realização prévia da aula de mini-trampolim. Pode-se concluir que a aula no mini-trampolim traz como efeito agudo a influência negativa no desempenho da força em mulheres treinadas.Lemos A, Simão R, Miranda F, Novaes J. Influência aguda de uma aula de mini-trampolim no agachamento. Fit Perf J.2007;6(2):76-81.

show abstract

“…Alguns protocolos manipulam a duração de cada estágio incremental, a inclinação ou os intervalos entre cada estágio incremental. Na literatura verificam-se estudos que compararam protocolos com diferentes durações dos está-gios de corrida incremental 5,10 , e protocolos com incrementos distintos -velocidade e inclinação da esteira 11 . No entanto, faz-se necessária a realização de estudos que comparem os efeitos de diferentes intervalos entre os estágios de velocidade de protocolos incrementais de corrida na determinação de limiares.…”

Section: Introductionunclassified