medigraphic.com
Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán

2008, Number 4

<< Back Next >>

Rev Invest Clin 2008; 60 (4)

VT/tI Relationship during steady-state exercise on a treadmill at the intensity close to second ventilatory threshold

Benito PJ, Calderón FJ, Peinado AB, Lorenzo I, Díaz V

Language: Spanish
References: 32
Page: 297-302
PDF size: 119.23 Kb.


ABSTRACT

Introduction. Few works have approached the study of the tidal volumen/inspiratory time (VT/tI) relationship during long and constant load exercise in treadmill. The aim of the present study was to analyze the relationship VT/tI to an intensity corresponding to the mean point among the two ventilatory thresholds. Material and methods. Twenty-four males have participated, carrying out two tests in treadmill: 1) maximal incremental test and 2) a 30 minutes constant load test at the intensity corresponding to the mean point among the two ventilatory thresholds. The respiratory parameters, acid-base parameters and lactate concentration was analysed during the constant load test. Results. The breakpoint of relationship VT/tI during the maximum test was reached at VT 2,886 (465) mL, tI 0.57 (0.10) s and oxygen uptake (VO2) 4,606 (532.9) mL/min. During the effort at constant load the relationships VT/tI and tI/tTOT (inspiratory time/total time) were significantly lower to those corresponding to the breakpoint of Hering-Breuer (PHB). Although the lactate concentration was superior to 4 mmol/L, the parameters of the acid-base state stayed inside the limits that allowed to conclude the whole test. Conclusions. A value of the relationship VT/tI is adopted below the PHB, determinated with a maximum test, during an effort of 30 minutes at an intensity corresponding to the mean point among the two ventilatory thresholds. Both, carbon dioxide pressure end tidal values (Pet CO2) and the acid-base state, stay stable and below the values corresponding to the PHB.


REFERENCES

  1. Clark FJ, von Euler C. On the regulation of depth and rate of breathing. J Physiol 1972; 222: 267-95.

  2. Ellingsen I, Sydnes G, Hauge A, Nicolaysen G. Effects of exercise and CO2 inhalation on the breathing pattern in man. Acta Physiol Scand 1988; 134: 161-73.

  3. Lucia A, Carvajal A, Calderon FJ, Alfonso A, Chicharro JL. Breathing pattern in highly competitive cyclists during incremental exercise. Eur J Appl Physiol Occup Physiol 1999; 79: 512-21.

  4. Benito PJ, Calderon FJ, Garcia-Zapico A, Legido JC, Caballero JA. Response of tidal volume to inspiratory time ratio during incremental exercise. Arch Bronconeumol 2006; 42: 62-7.

  5. Lind F, Hesser CM. Breathing pattern and lung volumes during exercise. Acta Physiol Scand 1984; 120: 123-9.

  6. Dempsey JA, Adams L, Ainsworth DM, Fregosi RF, Gallagher CG, Guz A, et al. Airway, lung and respiratory muscle function during exercise. In: Rowell LB, Shepherd JT (eds.). Handbook of physiology. New York: Oxford University Press; 1996, p. 448-514.

  7. Weissman C, Askanazi J, Rosenbaum SH, Hyman AI, Milic- Emili J, Kinney JM. The effects of posture on the metabolic and ventilatory response to low level steady state exercise. Clin Sci (Lond) 1986; 71: 553-8.

  8. González-García M, Barrero M, Maldonado D. Exercise limitation in patients with chronic obstructive pulmonary disease at the altitude of Bogota (2.640 m). Breathing pattern and arterial gases at rest and peak exercise. Arch Bronconeumol 2004; 40: 54-61.

  9. Beneke R. Maximal lactate steady state concentration (MLSS): experimental and modelling approaches. Eur J Appl Physiol 2003; 88: 361-9.

  10. Billat VL, Sirvent P, Py G, Koralsztein JP, Mercier J. The concept of maximal lactate steady state: a bridge between biochemistry, physiology and sport science. Sports Med 2003; 33: 407-26.

  11. Denadai BS, Ruas VD, Figueira TR. Maximal lactate steady state concentration independent of pedal cadence in active individuals. Eur J Appl Physiol 2006; 96: 477-80.

  12. Macintosh BR, Esau S, Svedahl K. The lactate minimum test for cycling: estimation of the maximal lactate steady state. Can J Appl Physiol 2002; 27: 232-49.

  13. Peinado PJ, Di Salvo V, Pigozzi F, Bermudez AI, Peinado LAB, Calderon MFJ, et al. Steady-state acid-base response at exercise levels close to maximum lactate steady state. Clin J Sport Med 2006; 16: 244-6.

  14. Laplaud D, Guinot M, Favre-Juvin A, Flore P. Maximal lactate steady state determination with a single incremental test exercise. Eur J Appl Physiol 2006; 96: 446-52.

  15. Rietjens GJ, Kuipers H, Kester AD, Keizer HA. Validation of a computerized metabolic measurement system (Oxycon-Pro) during low and high intensity exercise. Int J Sports Med 2001; 22: 291-94.

  16. Foss O, Hallen J. Validity and stability of a computerized metabolic system with mixing chamber. Int J Sports Med 2005; 26: 569-75.

  17. Sun XG, Hansen JE, Garatachea N, Storer TW, Wasserman K. Ventilatory efficiency during exercise in healthy subjects. Am J Respir Crit Care Med 2002; 166: 1443-8.

  18. Gaskill SE, Ruby BC, Walker AJ, Sanchez OA, Serfass RC, Leon AS. Validity and reliability of combining three methods to determine ventilatory threshold. Med Sci Sports Exerc 2001; 33: 1841-8.

  19. Patberg WR. Effect of graded vagal blockade and pulmonary volume on tonic inspiratory activity in rabbits. Pflugers Arch 1983; 398: 88-92.

  20. Cross BA, Guz A, Jain SK, Archer S, Stevens J, Reynolds F. The effect of anaesthesia of the airway in dog and man: a study of respiratory reflexes, sensations and lung mechanics. Clin Sci Mol Med 1976; 50: 439-54.

  21. Sciurba FC, Owens GR, Sanders MH, Costantino JP, Paradis IL, Griffith BP. The effect of obliterative bronchiolitis on breathing pattern during exercise in recipients of heart-lung transplants. Am Rev Respir Dis 1991; 144: 131-5.

  22. Flynn C, Forster HV, Pan LG, Bisgard GE. Role of hilar nerve afferents in hyperpnea of exercise. J Appl Physiol 1985; 59: 798-806.

  23. Ainsworth DM, Smith CA, Johnson BD, Eicker SW, Henderson KS, Dempsey JA. Vagal modulation of respiratory muscle activity in awake dogs during exercise and hypercapnia. J Appl Physiol 1992; 72: 1362-7.

  24. Joyner MJ, Jilka SM, Taylor JA, Kalis JK, Nittolo J, Hicks RW, et al. Beta-blockade reduces tidal volume during heavy exercise in trained and untrained men. J Appl Physiol 1987; 62: 1819-25.

  25. Matsuoka T, Mortola JP. Effects of hypoxia and hypercapnia on the Hering-Breuer reflex of the conscious newborn rat. J Appl Physiol 1995; 78: 5-11.

  26. Ruiz de Ona LJM, Garcia de Pedro J, Puente ML, Llorente ID, Celdran GJ, Cubillo MJM. Effects of muscle training on breathing pattern in patients with severe chronic obstructive pulmonary disease. Arch Bronconeumol 2004; 40: 20-3.

  27. Sejersted OM, Medbo JI, Hermansen L. Metabolic acidosis and changes in water and electrolyte balance after maximal exercise. Ciba Found Symp 1982; 87: 153-67.

  28. Lindinger MI, Heigenhauser GJ, McKelvie RS, Jones NL. Blood ion regulation during repeated maximal exercise and recovery in humans. Am J Physiol 1992; 262: R126-R136.

  29. Roe SM, Nolan P, O’Regan RG, McNicholas WT, McLoughlin P. Potassium and ventilation during exercise above and below the ventilatory threshold. Respir Physiol 1997; 109: 117-26.

  30. Paterson DJ, Robbins PA, Conway J. Changes in arterial plasma potassium and ventilation during exercise in man. Respir Physiol 1989; 78: 323-30.

  31. Hayashi K, Honda Y, Ogawa T, Kondo N, Nishiyasu T. Relationship between ventilatory response and body temperature during prolonged submaximal exercise. J Appl Physiol 2006; 100: 414-20.

  32. Mortola JP, Frappell PB. Ventilatory responses to changes in temperature in mammals and other vertebrates. Annu Rev Physiol 2000; 62: 847-74.




2020     |     www.medigraphic.com