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Home / Equine Research Bank / J Appl Physiol (1985) / V(O2) recovery kinetics in the horse following moderate, hea...
Journal of applied physiology (Bethesda, Md. : 1985)1999; 86(4); 1170-1177; doi: 10.1152/jappl.1999.86.4.1170

V(O2) recovery kinetics in the horse following moderate, heavy, and severe exercise.

Abstract: At the onset of exercise, horses exhibit O2 uptake (VO2) kinetics that are qualitatively similar to those of humans. In humans, there is a marked dissymmetry between on- and off-kinetics for VO2. This investigation sought to formally characterize the off-transient (recovery) VO2 kinetics in the horse within the moderate (M), heavy (H), and severe (S) exercise domains. Six horses were run on a high-speed treadmill at M, H, and S exercise intensities (i.e., that speed which yielded approximately 50, 85, 100% peak VO2, respectively, on the maximal incremental test). The time courses for the recovery were modeled by using a three-phase model with a single-exponential (fast component) or double-exponential (fast and slow component) phase 2. The single-exponential phase 2 model provided an excellent fit to the off-transient data, with the exception of one horse in the H domain which was best modeled by a double exponential. The time delay elicited no domain dependency (M, 18.0 +/- 1.0; H, 17.6 +/- 1.1; S, 17.8 +/- 2.0 s; P > 0.05), as was the case for the fast-component time constants (M, 16.3 +/- 2.0 s; H, 13.5 +/- 1.0 s; S, 14.6 +/- 0.3 s; P > 0.05). In the H and S (but not M) domains, the VO2 following resolution of the fast component was elevated above the preexercise baseline (H, 3.0 +/- 1.0 l/min; S, 5.7 +/- 1.1 l/min). This additional postexercise VO2 was correlated to the end-exercise increase in lactate (r = 0.94, P 0.05). These data indicate that the time delay and subsequent kinetic response of the primary (fast-component) phase of exercise VO2 recovery in the horse is independent of the preceding exercise-intensity domain. However, in the H and S domains, the fast component resolves to an elevated baseline.
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Publication Date: 1999-04-08 PubMed ID: 10194199DOI: 10.1152/jappl.1999.86.4.1170Google Scholar: Lookup
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  • Comparative Study
  • Journal Article
  • Research Support
  • U.S. Gov't
  • P.H.S.

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research studied how quickly horses restore their oxygen levels (VO2) after different exercise intensities. The findings suggest that the VO2 recovery rate is generally similar regardless of whether the exercise was moderate, heavy, or severe, but following heavy and severe workouts, the horse’s VO2 levels were higher than before the exercise.

Research Purpose

This research was performed to understand the recovery kinetics of oxygen uptake (VO2) in horses post-exercise. The research aimed to characterize the recovery VO2 kinetics at varying levels of intensity – moderate (M), heavy (H), and severe (S) exercise domains.

Methodology

  • Six horses were put through treadmill running sessions at different exercise intensities matching approximately 50, 85, and 100% of peak VO2.
  • The recovery periods were modeled using a three-phase model with a single-exponential (fast component) or double-exponential (fast and slow component) phase 2.
  • Time delay and the fast-component time constants were measured from each exercise intensity domain.
  • In the H and S domains, the post-exercise VO2 was also observed and was compared to pre-exercise baseline.
  • The additional post-exercise VO2 and the end-exercise increase in lactate were correlated.

Results

  • The single-exponential phase 2 model fitted the data for most of the horses exceptionally well, except for one horse from the H domain, which fitted best with a double-exponential.
  • The time delay showed no domain dependency, meaning it didn’t vary based on exercise intensity.
  • The fast-component time constants also didn’t change with differing exercise intensity.
  • In the H and S domains, the VO2 following the resolution was above the pre-exercise baseline, marking an increase in the VO2 level post-exercise in these domains.
  • The additional post-exercise VO2 correlated strongly with the end-exercise increase in lactate (r = 0.94, P 0.05).

Conclusion

The time delay and the subsequent kinetic response of the primary phase of VO2 recovery in horses were found to be independent of the preceding exercise-intensity domain. However, in the heavy and severe domains, after the fast component was resolved, the VO2 levels were elevated from their baseline.

Cite This Article

APA
Langsetmo I, Poole DC. (1999). V(O2) recovery kinetics in the horse following moderate, heavy, and severe exercise. J Appl Physiol (1985), 86(4), 1170-1177. https://doi.org/10.1152/jappl.1999.86.4.1170

Publication

Journal of applied physiology (Bethesda, Md. : 1985)
ISSN: 8750-7587
NlmUniqueID: 8502536
Country: United States
Language: English
Volume: 86
Issue: 4
Pages: 1170-1177

Researcher Affiliations

Langsetmo, I
  • Departments of Anatomy and Physiology and Kinesiology, Kansas State University, Manhattan, Kansas 66502-5602, USA.
Poole, D C

    MeSH Terms

    • Animals
    • Blood Pressure
    • Horses / physiology
    • Male
    • Muscle, Smooth, Vascular / physiology
    • Oxygen Consumption
    • Physical Conditioning, Animal / physiology
    • Physical Exertion / physiology
    • Pulmonary Artery / physiology
    • Regression Analysis
    • Time Factors

    Grant Funding

    • HL-17731 / NHLBI NIH HHS
    • HL-50306 / NHLBI NIH HHS

    Citations

    This article has been cited 6 times.
    1. Bei Y, Wang L, Ding R, Che L, Fan Z, Gao W, Liang Q, Lin S, Liu S, Lu X, Shen Y, Wu G, Yang J, Zhang G, Zhao W, Guo L, Xiao J. Animal exercise studies in cardiovascular research: Current knowledge and optimal design-A position paper of the Committee on Cardiac Rehabilitation, Chinese Medical Doctors' Association. J Sport Health Sci 2021 Dec;10(6):660-674.
      doi: 10.1016/j.jshs.2021.08.002pubmed: 34454088google scholar: lookup
    2. Hirai DM, Craig JC, Colburn TD, Eshima H, Kano Y, Musch TI, Poole DC. Skeletal muscle interstitial Po(2) kinetics during recovery from contractions. J Appl Physiol (1985) 2019 Oct 1;127(4):930-939.
      doi: 10.1152/japplphysiol.00297.2019pubmed: 31369325google scholar: lookup
    3. Behnke BJ, Ferreira LF, McDonough PJ, Musch TI, Poole DC. Recovery dynamics of skeletal muscle oxygen uptake during the exercise off-transient. Respir Physiol Neurobiol 2009 Sep 30;168(3):254-60.
      doi: 10.1016/j.resp.2009.07.013pubmed: 19619675google scholar: lookup
    4. Jones AM, Koppo K, Burnley M. Effects of prior exercise on metabolic and gas exchange responses to exercise. Sports Med 2003;33(13):949-71.
      doi: 10.2165/00007256-200333130-00002pubmed: 14606924google scholar: lookup
    5. Rossiter HB, Ward SA, Kowalchuk JM, Howe FA, Griffiths JR, Whipp BJ. Dynamic asymmetry of phosphocreatine concentration and O(2) uptake between the on- and off-transients of moderate- and high-intensity exercise in humans. J Physiol 2002 Jun 15;541(Pt 3):991-1002.
      doi: 10.1113/jphysiol.2001.012910pubmed: 12068057google scholar: lookup
    6. Ozyener F, Rossiter HB, Ward SA, Whipp BJ. Influence of exercise intensity on the on- and off-transient kinetics of pulmonary oxygen uptake in humans. J Physiol 2001 Jun 15;533(Pt 3):891-902.
      doi: 10.1111/j.1469-7793.2001.t01-1-00891.xpubmed: 11410644google scholar: lookup
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