A critical review of the history of low- to moderate-intensity steady-state VO2 kinetics

Robert Robergs

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14 Citations (Scopus)

Abstract

Research into the rate of whole-body oxygen consumption (VO2) kinetics during exercise increments to low- to moderate-intensity steady-state exercise was originally based on the theory of linear first-order VO2 kinetics, implying that the VO2 response to steady-state exercise increments is a mono-exponential response of the same time constant (tau, �') across all steady-state intensities. Despite the acceptance of this theory for more than 30 years, early research from the 1980s documented an increasing �' with increasing steady-state exercise intensity, and recent research has confirmed such results. Today, such evidence has led to retraction of the theory of linear firstorder VO2 kinetics. This history, revealing the premature acceptance of a theory, and subsequent scientific investigation using improved research design, instrumentation and data processing, has important implications for the fragility of scientific theories and the need for continual testing of theories in the search for facts and not prematurely accepted constructs. This review provides historical evidence for a critical reappraisal of the theory of linear first-order VO2 kinetics and presents data to show the need for changes in the data-processing 'standards' of the discipline to improve measurement of instantaneous VO2 kinetics and the time to steady state. For example, to date, no study of VO2 kinetics has quantified and statistically analysed the time to steady state. Furthermore, the instability of �' across different exercise increments, and for the same increment from different baseline VO2 demand, prevents �' from being a valid measure of VO2 kinetics for different exercise conditions. The concept of quantifying kinetics from a total non-linear response, when no other field of kinetics pursues this methodology, also raises concern for the methods and models used to interpret steady-state VO2 kinetics.
Original languageEnglish
Pages (from-to)641-653
Number of pages13
JournalSports Medicine
Volume44
Issue number5
DOIs
Publication statusPublished - May 2014

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title = "A critical review of the history of low- to moderate-intensity steady-state VO2 kinetics",
abstract = "Research into the rate of whole-body oxygen consumption (VO2) kinetics during exercise increments to low- to moderate-intensity steady-state exercise was originally based on the theory of linear first-order VO2 kinetics, implying that the VO2 response to steady-state exercise increments is a mono-exponential response of the same time constant (tau, {\~A}�') across all steady-state intensities. Despite the acceptance of this theory for more than 30 years, early research from the 1980s documented an increasing {\~A}�' with increasing steady-state exercise intensity, and recent research has confirmed such results. Today, such evidence has led to retraction of the theory of linear firstorder VO2 kinetics. This history, revealing the premature acceptance of a theory, and subsequent scientific investigation using improved research design, instrumentation and data processing, has important implications for the fragility of scientific theories and the need for continual testing of theories in the search for facts and not prematurely accepted constructs. This review provides historical evidence for a critical reappraisal of the theory of linear first-order VO2 kinetics and presents data to show the need for changes in the data-processing 'standards' of the discipline to improve measurement of instantaneous VO2 kinetics and the time to steady state. For example, to date, no study of VO2 kinetics has quantified and statistically analysed the time to steady state. Furthermore, the instability of {\~A}�' across different exercise increments, and for the same increment from different baseline VO2 demand, prevents {\~A}�' from being a valid measure of VO2 kinetics for different exercise conditions. The concept of quantifying kinetics from a total non-linear response, when no other field of kinetics pursues this methodology, also raises concern for the methods and models used to interpret steady-state VO2 kinetics.",
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A critical review of the history of low- to moderate-intensity steady-state VO2 kinetics. / Robergs, Robert.

In: Sports Medicine, Vol. 44, No. 5, 05.2014, p. 641-653.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A critical review of the history of low- to moderate-intensity steady-state VO2 kinetics

AU - Robergs, Robert

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = May; Journal title (773t) = Sports Medicine. ISSNs: 0112-1642;

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N2 - Research into the rate of whole-body oxygen consumption (VO2) kinetics during exercise increments to low- to moderate-intensity steady-state exercise was originally based on the theory of linear first-order VO2 kinetics, implying that the VO2 response to steady-state exercise increments is a mono-exponential response of the same time constant (tau, �') across all steady-state intensities. Despite the acceptance of this theory for more than 30 years, early research from the 1980s documented an increasing �' with increasing steady-state exercise intensity, and recent research has confirmed such results. Today, such evidence has led to retraction of the theory of linear firstorder VO2 kinetics. This history, revealing the premature acceptance of a theory, and subsequent scientific investigation using improved research design, instrumentation and data processing, has important implications for the fragility of scientific theories and the need for continual testing of theories in the search for facts and not prematurely accepted constructs. This review provides historical evidence for a critical reappraisal of the theory of linear first-order VO2 kinetics and presents data to show the need for changes in the data-processing 'standards' of the discipline to improve measurement of instantaneous VO2 kinetics and the time to steady state. For example, to date, no study of VO2 kinetics has quantified and statistically analysed the time to steady state. Furthermore, the instability of �' across different exercise increments, and for the same increment from different baseline VO2 demand, prevents �' from being a valid measure of VO2 kinetics for different exercise conditions. The concept of quantifying kinetics from a total non-linear response, when no other field of kinetics pursues this methodology, also raises concern for the methods and models used to interpret steady-state VO2 kinetics.

AB - Research into the rate of whole-body oxygen consumption (VO2) kinetics during exercise increments to low- to moderate-intensity steady-state exercise was originally based on the theory of linear first-order VO2 kinetics, implying that the VO2 response to steady-state exercise increments is a mono-exponential response of the same time constant (tau, �') across all steady-state intensities. Despite the acceptance of this theory for more than 30 years, early research from the 1980s documented an increasing �' with increasing steady-state exercise intensity, and recent research has confirmed such results. Today, such evidence has led to retraction of the theory of linear firstorder VO2 kinetics. This history, revealing the premature acceptance of a theory, and subsequent scientific investigation using improved research design, instrumentation and data processing, has important implications for the fragility of scientific theories and the need for continual testing of theories in the search for facts and not prematurely accepted constructs. This review provides historical evidence for a critical reappraisal of the theory of linear first-order VO2 kinetics and presents data to show the need for changes in the data-processing 'standards' of the discipline to improve measurement of instantaneous VO2 kinetics and the time to steady state. For example, to date, no study of VO2 kinetics has quantified and statistically analysed the time to steady state. Furthermore, the instability of �' across different exercise increments, and for the same increment from different baseline VO2 demand, prevents �' from being a valid measure of VO2 kinetics for different exercise conditions. The concept of quantifying kinetics from a total non-linear response, when no other field of kinetics pursues this methodology, also raises concern for the methods and models used to interpret steady-state VO2 kinetics.

KW - Exercise

KW - History

KW - Human

KW - Medical research

KW - Oxygen consumption

KW - Physiology

KW - Standards

U2 - 10.1007/s40279-014-0161-2

DO - 10.1007/s40279-014-0161-2

M3 - Article

C2 - 24563157

VL - 44

SP - 641

EP - 653

JO - Sports Medicine

JF - Sports Medicine

SN - 0112-1642

IS - 5

ER -