Physiological responses at the fatigue threshold

T. J. Housh; G. O. Johnson; S. L. McDowell; D. J. Housh; M. Pepper

doi:10.1055/s-2007-1024686

Physiological responses at the fatigue threshold

T. J. Housh, G. O. Johnson, S. L. McDowell, D. J. Housh, M. Pepper

Oral Biology

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

The purpose of this investigation was to determine the oxygen consumption, heart rate and plasma lactate responses at the fatigue threshold (FT) and estimate the length of time the FT could be maintained. Ten adult males (x̄ age ± SD = 21.1 ± 1.3 yrs) volunteered to perform a maximal treadmill test and FT test. During the maximal test, V̇O₂, heart rate and plasma lactate measurements were taken. The results of the investigation indicated that the FT (14.0±1.2 Km·hr^-1, 197±8 bpm; 47.5±5.7 ml/kg·min ^-1, 5.4±103 mM) was very close to a maximal effort (V̇O₂max = 14.4±1.2 Km·hr^-1, 203±10 bpm; 49.5±6.1 ml/kg·min^-1, 7.4±2.1 mM) and could be maintained for only 0.16 to 0.28 hrs. These findings do not support the validity of the FT as a measure of the maximal running velocity that can be continued for an extended period of time without exhaustion.

Original language	English (US)
Pages (from-to)	305-308
Number of pages	4
Journal	International Journal of Sports Medicine
Volume	12
Issue number	3
DOIs	https://doi.org/10.1055/s-2007-1024686
State	Published - 1991

ASJC Scopus subject areas

Orthopedics and Sports Medicine
Physical Therapy, Sports Therapy and Rehabilitation

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title = "Physiological responses at the fatigue threshold",

abstract = "The purpose of this investigation was to determine the oxygen consumption, heart rate and plasma lactate responses at the fatigue threshold (FT) and estimate the length of time the FT could be maintained. Ten adult males ({\=x} age ± SD = 21.1 ± 1.3 yrs) volunteered to perform a maximal treadmill test and FT test. During the maximal test, {\.V}O2, heart rate and plasma lactate measurements were taken. The results of the investigation indicated that the FT (14.0±1.2 Km·hr-1, 197±8 bpm; 47.5±5.7 ml/kg·min -1, 5.4±103 mM) was very close to a maximal effort ({\.V}O2max = 14.4±1.2 Km·hr-1, 203±10 bpm; 49.5±6.1 ml/kg·min-1, 7.4±2.1 mM) and could be maintained for only 0.16 to 0.28 hrs. These findings do not support the validity of the FT as a measure of the maximal running velocity that can be continued for an extended period of time without exhaustion.",

author = "Housh, {T. J.} and Johnson, {G. O.} and McDowell, {S. L.} and Housh, {D. J.} and M. Pepper",

year = "1991",

doi = "10.1055/s-2007-1024686",

language = "English (US)",

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pages = "305--308",

journal = "International Journal of Sports Medicine",

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AU - Housh, T. J.

AU - Johnson, G. O.

AU - McDowell, S. L.

AU - Housh, D. J.

AU - Pepper, M.

PY - 1991

Y1 - 1991

N2 - The purpose of this investigation was to determine the oxygen consumption, heart rate and plasma lactate responses at the fatigue threshold (FT) and estimate the length of time the FT could be maintained. Ten adult males (x̄ age ± SD = 21.1 ± 1.3 yrs) volunteered to perform a maximal treadmill test and FT test. During the maximal test, V̇O2, heart rate and plasma lactate measurements were taken. The results of the investigation indicated that the FT (14.0±1.2 Km·hr-1, 197±8 bpm; 47.5±5.7 ml/kg·min -1, 5.4±103 mM) was very close to a maximal effort (V̇O2max = 14.4±1.2 Km·hr-1, 203±10 bpm; 49.5±6.1 ml/kg·min-1, 7.4±2.1 mM) and could be maintained for only 0.16 to 0.28 hrs. These findings do not support the validity of the FT as a measure of the maximal running velocity that can be continued for an extended period of time without exhaustion.

AB - The purpose of this investigation was to determine the oxygen consumption, heart rate and plasma lactate responses at the fatigue threshold (FT) and estimate the length of time the FT could be maintained. Ten adult males (x̄ age ± SD = 21.1 ± 1.3 yrs) volunteered to perform a maximal treadmill test and FT test. During the maximal test, V̇O2, heart rate and plasma lactate measurements were taken. The results of the investigation indicated that the FT (14.0±1.2 Km·hr-1, 197±8 bpm; 47.5±5.7 ml/kg·min -1, 5.4±103 mM) was very close to a maximal effort (V̇O2max = 14.4±1.2 Km·hr-1, 203±10 bpm; 49.5±6.1 ml/kg·min-1, 7.4±2.1 mM) and could be maintained for only 0.16 to 0.28 hrs. These findings do not support the validity of the FT as a measure of the maximal running velocity that can be continued for an extended period of time without exhaustion.

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