An Evaluation of the Predictive Validity and Reliability of Ventilatory Threshold

Amann, Markus; Subudhi, Andrew W.; Walker, Jim; Eisenman, Patricia A.; Shultz, Barry B.; Foster, Carl

doi:10.1249/01.mss.0000142305.18543.34

Cited by 72 publications

(62 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Another useful index for aerobic endurance in sports, like triathlon and cycling, is the VT (Bentley & McNaughton, 2003) and this can distinguish aerobic fitness when expressed in relation to %VO 2 max (Loftin & Warren, 1994). The ability to sustain high aerobic intensity exercise during an endurance exercise appears to be related to VT relative to %VO 2 peak (Amann et al, 2004;Roels et al, 2005). VT increased significantly for the SMAT showing an improvement in the cardiorespiratory function in addition to the improvement of the VO 2 peak reached.…”

Section: Aerobic Capacitymentioning

confidence: 99%

XP-Antarctik Expedition: The Effect of a Month-Long Expedition in Antarctica on Physiological Performance

Parent¹,

Martín²,

Morales³

et al. 2018

Journal of Human Performance in Extreme Environments

View full text Add to dashboard Cite

Antarctica is a challenging habitat for humans. A group of 6 explorers (3 women and 3 men) participated in an expedition in Antarctica. The objective was to observe the physiological acclimatization of the explorers using the following strategies: physical preparation, highcaloric nutritional intake, and the latest physiological monitoring and outdoor equipment. Anthropometric measures (dual x-ray absorptiometry), specific maximal aerobic test, maximal aerobic running speed test, submaximal aerobic cold testing, strength tests (grip strength, leg press and chin up), and endurance tests (bar suspension and chair position) were conducted pre-and post-expedition. Due to the sample size, a paired t-test was used for normally distributed data and non-parametric (Wilcoxon) to compare values pre-and post-expedition. Effect sizes are presented as Cohen's d. The lean mass for the women was significantly higher after the expedition (45.4 ¡ 4.4 vs. 47.1 ¡ 4.1 kg; p 5 0.040, d 5 1.86); however, no significant difference was observed for the men (66.7 ¡ 7.3 vs. 66.0 ¡ 5.7 kg; p 5 0.581, d 5 0.11). Pre-and post-expedition values were significantly different for the specific maximal aerobic test, where the VO 2 peak was 40.8 ¡ 4.2 vs. 46.9 ¡ 7.4 ml/kg/min, respectively (p 5 0.027, d 5 1.01), but no significant difference was observed for the other aerobic tests. The muscular testing did not change significantly, except for the left leg one maximal repetition (295 ¡ 110 vs. 364 ¡ 135 lb, preand post-expedition respectively, p 5 0.031, d 5 20.56). The overall preparation for the expedition appears to be a key aspect in order to countermeasure the physical ability decay during an Antarctica expedition. However, further studies will need to be developed to discern the importance of the preparation components.

show abstract

Section: Aerobic Capacitymentioning

confidence: 99%

XP-Antarctik Expedition: The Effect of a Month-Long Expedition in Antarctica on Physiological Performance

Parent¹,

Martín²,

Morales³

et al. 2018

Journal of Human Performance in Extreme Environments

View full text Add to dashboard Cite

show abstract

“…O primeiro limiar, conhecido como limiar aeróbio, reflete a intensidade do exercício correspondente ao início do acúmulo de lactato sanguíneo, e também pode ser chamado de primeiro limiar ventilatório (LV 1 ). O segundo limiar é considerado o ponto de compensação respiratória 6 ou segundo limiar ventilatório (LV 2 ), definido como a intensidade de esforço acima da qual a produção de lactato supera sua própria remoção, provocando hiperventilação, necessária para a diminuição da pressão parcial de dióxido de carbono (PCO 2 ) venosa e para o restabelecimento das concentrações de bicarbonato (HCO 3-), aumentando o pH plasmático [7][8] . Estas duas variáveis (VO 2max e LV 2 ) são consideradas parâmetros fundamentais na definição da capacidade aeróbia de um indivíduo 9 e, embora testes de campo possam ser empregados para estimação de tais variáveis metabólicas, a ergoespirometria consiste em um confiável método não-invasivo capaz de determinar com considerável precisão o VO 2max e o LV 2 pela quantificação das trocas gasosas realizadas pelo avaliado durante o exercício 1 .…”

unclassified

Estudo descritivo-comparativo de parâmetros de desempenho aeróbio de atletas profissionais de futebol e futsal. DOI: 10.5007/1980-0037.2011v13n3p170

Baroni

Couto

Leal-Junior

2011

Rev. Bras. Cineantropom. Desempenho Hum.

View full text Add to dashboard Cite

show abstract

“…On the other hand, the AT reliability has been already demonstrated in apparently healthy individuals (27). Apart from that, every volunteer did a 3-minute adaptation period to treadmill and gases analyzer equipment on both tests.…”

Section: Resultsmentioning

confidence: 87%

Short-term daily steps increment enhances submaximal exercise tolerance in healthy insuficiently active men

Porto

Fontana

Molina

et al. 2014

Rev Bras Ativ Fis Saude

View full text Add to dashboard Cite

Short AbstrActThe 10000 steps/day message has been proposed as a minimum steps/day target for healthy adults. Nevertheless, this target does not seem feasible as an initial goal for inactive adults. New strategies to progressively increase daily steps should be evaluated. The study evaluated the effectiveness of increase a pedometer-measured 3500 steps/day on physical performance at anaerobic threshold (AT). Nineteen healthy insufficiently active men, 19-46 yrs, wore a pedometer for 2 weeks to quantify their habitual daily steps at baseline. Afterwards, subjects were instructed to increase 3500 steps/day above baseline during 3 weeks (intervention). Cardiopulmonary exercise stress tests (CPX) were performed before and after the intervention. Submaximal exercise tolerance was analyzed by the heart rate at AT (HR-AT), the oxygen uptake at AT (VO2-AT), the time spent on CPX until AT onset and the reached distance. Nonparametric statistics were applied, expressing the results as median and minimum and maximum values. The variables were pair-wised compared by the Wilcoxon test. The differences were considered statistically significant when a two-tailed P-value was less than 5%. At baseline, median (min-max) of daily steps was 7295 (4700-14752 steps), whereas it was 11772 (8998-18620 steps) after the intervention (p=0.0001). On CPX, time until AT onset was higher after (359s; 179-521s) than before daily steps improvement (340s; 208-436s) (p=0.027). Similarly, the distance attained at AT was higher after (398.6m; 165.6-637.5m) than before the intervention (372.2m; 197.8-528.8m) (p=0.014). The increment of 3500 steps/day above baseline, during three weeks, was effective for improving exercise tolerance at AT. KeywordsWalking; Pedometer; Physical activity; Inactivity; Health promotion. (398.6m; 165.6-637.5m), comparativamente a antes da intervenção (372.2m; 197.8-528.8m) (p=0.014). O incremento de 3500 passos por dia acima do padrão habitual, durante três semanas, foi eficaz para aumentar a tolerância ao exercício no LA. resumo A mensagem dos 10000 passos diários tem sido proposta como meta mínima de passos para adultos saudáveis. Entretanto, esta meta parece não ser factível como objetivo inicial para homens inativos. Novas estratégias de aumento progressivo nos passos diários devem ser avaliadas. Este estudo avaliou a eficácia do incremento de 3500 passos por dia, medidos por pedômetro, no desempenho físico no limiar anaeróbi-co (LA). Dezenove homens saudáveis insuficientemente ativos, 19-46 anos, usaram um pedômetro por 2 semanas para quantificar o padrão habitual de passos diários. Em seguida, foram orientados a aumentarem 3500 passos/dia acima do padrão usual, durante 3 semanas (intervenção

show abstract

An Evaluation of the Predictive Validity and Reliability of Ventilatory Threshold

Abstract: The high test-retest reliability and consistent ability to accurately predict athletes' 40K(avgwatts) across a competitive season indicated that VE/VO2 was superior to the other evaluated methods.

Cited by 72 publications

References 24 publications

XP-Antarctik Expedition: The Effect of a Month-Long Expedition in Antarctica on Physiological Performance

XP-Antarctik Expedition: The Effect of a Month-Long Expedition in Antarctica on Physiological Performance

Estudo descritivo-comparativo de parâmetros de desempenho aeróbio de atletas profissionais de futebol e futsal. DOI: 10.5007/1980-0037.2011v13n3p170

Short-term daily steps increment enhances submaximal exercise tolerance in healthy insuficiently active men

Contact Info

Product

Resources

About