Validity and reliability of combining three methods to determine ventilatory threshold

Gaskill, Steven E.; Ruby, Brent C.; Walker, A. J.; Sánchez, Otto A.; Serfass, R. C.; Leon, Arthur S.

doi:10.1097/00005768-200111000-00007

Cited by 326 publications

(302 citation statements)

References 25 publications

Supporting

Mentioning

278

Contrasting

Unclassified

Order By: Relevance

“…Exercise variables were measured and averaged in 30-s intervals throughout each test stage and at peak exercise; peak exercise was defined as the last 30 s of loaded exercise. The ventilatory threshold (VTh) was detected individually using the Vslope method (4) and verified by combining three methods (19). Relationships between VT and ventilation (V E) were examined, and a point of inflection was determined for each subject (22).…”

Section: Cardiopulmonary Exercise Testingmentioning

confidence: 99%

Sex differences in the perceived intensity of breathlessness during exercise with advancing age

Ofir

Laveneziana²,

Webb³

et al. 2008

Journal of Applied Physiology

View full text Add to dashboard Cite

prevalence of activity-related breathlessness increases with age, particularly in women, but the specific underlying mechanisms have not been studied. This novel cross-sectional study was undertaken to examine the effects of age and sex, and their interaction, on the perceptual and ventilatory responses to incremental treadmill exercise in 73 healthy participants (age range 40 -80 yr old) with normal pulmonary function. Age-related changes at a standardized oxygen uptake (V O2) during exercise included significant increases in breathlessness ratings (Borg scale), ventilation (V E), ventilatory equivalent for carbon dioxide, and the ratio of tidal volume (VT) to dynamic inspiratory capacity (IC) (all P Ͻ 0.05). These changes were quantitatively similar in women (n ϭ 39) and in men (n ϭ 34). For the group as a whole, exertional breathlessness ratings increased as resting static inspiratory muscle strength diminished (P ϭ 0.05), as exercise ventilation increased relative to capacity (P ϭ 0.013) and as the VT/IC ratio increased (P ϭ 0.003) during exercise. Older women (60 -80 yr old, n ϭ 23) reported greater (P Ͻ 0.05) intensity of exertional breathlessness at a standardized V O2 and V E than age-matched men (n ϭ 16), despite similar age-related changes in ventilatory demand and dynamic ventilatory mechanics. These increases in breathlessness ratings in older women disappeared when sex differences in baseline maximal ventilatory capacity were accounted for. In conclusion, although increased exertional breathlessness with advancing age is multifactorial, contributory factors included higher ventilatory requirements during exercise, progressive inspiratory muscle weakness, and restrictive mechanical constraints on VT expansion related to reduced IC. The sensory consequences of this age-related respiratory impairment were more pronounced in women, who, by nature, have relatively reduced maximal ventilatory reserve. dyspnea; aging; inspiratory capacity CARDIOVASCULAR FACTORS are widely accepted as a proximate limit to maximal oxygen uptake (V O 2 ) during weight-bearing exercise in healthy humans (42,48). By contrast, the respiratory system is regarded as relatively "overbuilt" and less likely to contribute to exercise limitation except in elite athletes at very high power outputs (15, 21). However, it is recognized that in sedentary older individuals, intolerable exertional breathlessness may contribute to exercise limitation even before physiological maxima are attained (39). A number of studies have reported that more than 30% of the elderly (Ͼ65 yr) experience breathlessness during activities of daily living (23,24,30,47). The nature and mechanisms of exertional breathlessness in older healthy humans are poorly understood.While the physiological effects of aging on the respiratory system are well established (14,25,40), the interaction between these changes in respiratory system compliance, muscle function, and ventilation/perfusion (V /Q ) matching and the perceptual responses to physical exertion is largely unknow...

show abstract

Section: Cardiopulmonary Exercise Testingmentioning

confidence: 99%

Sex differences in the perceived intensity of breathlessness during exercise with advancing age

Ofir

Laveneziana²,

Webb³

et al. 2008

Journal of Applied Physiology

View full text Add to dashboard Cite

show abstract

“…AT detection by ventilatory methods is considered valid 5,14,16,25 and in healthy subjects and athletes, it has proven to be highly reproducible 5,25 . In HF patients, the validity of ventilatory methods is questioned, because of difficulties in detecting AT 1,6,12,14,26 in this population, and because of the inherent subjectivity of the visual analysis.…”

Section: Discussionmentioning

confidence: 99%

“…In both methods, the AT was assessed in charts with eight-breath moving average 15 . In the visual-graphic method, AT was defined as the point at which there was a break in the linearity of the response of VCO 2 compared to VO 2 , as a function of time 15 ; and in the V-slope method, AT was determined as the point from which there was a change in the slope of the curve 1,5,[12][13][14] . To evaluate reproducibility, three investigators with prior training in both methods determined the AT independently.…”

Section: Experimental Protocolmentioning

confidence: 99%

“…The VO 2 max is affected by age, gender, medical condition, or medication use [2][3][4] . In HF, this plateau is rarely reached, and the peak exercise oxygen consumption achieved without reaching a plateau (VO 2peak ) is used to determine the functional capacity 1,2,5,6 .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a ventilatory threshold coincident with the AT 13,14 , which is detected by gas analysis using spirometry. 15 Both VO 2peak and AT determined by the ventilatory method are considered valid and reproducible in healthy subjects 1,5,14,16 . However, as the determination of maximum stress can be subjective in individuals with HF 1,16 , AT can be an alternative option comparable to the VO 2peak to predict aerobic performance 1,8,13,[16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reprodutibilidade da determinação do limiar anaeróbico em pacientes com insuficiência cardíaca

Vieira

Ribeiro-Samora

Lopes

et al. 2010

Arq. Bras. Cardiol.

View full text Add to dashboard Cite

show abstract

Aerobic exercise training programmes for improving physical and psychosocial health in adults with Down syndrome

Andriolo

Dib

Ramos

et al. 2005

Cochrane Database of Systematic Reviews

View full text Add to dashboard Cite

Validity and reliability of combining three methods to determine ventilatory threshold

Abstract: The combined method to determine VT is valid and reliable across a wide fitness range in healthy individuals and improves the determination rate and accuracy of VT determination over the use of single methods.

Cited by 326 publications

References 25 publications

Sex differences in the perceived intensity of breathlessness during exercise with advancing age

Sex differences in the perceived intensity of breathlessness during exercise with advancing age

Reprodutibilidade da determinação do limiar anaeróbico em pacientes com insuficiência cardíaca

Aerobic exercise training programmes for improving physical and psychosocial health in adults with Down syndrome

Contact Info

Product

Resources

About