Group- and individual-level coincidence of the 'Fatmax' and lactate accumulation in adolescents

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Group- and individual-level coincidence of the 'Fatmax' and lactate accumulation in adolescents. / Tolfrey, K; Jeukendrup, Asker; Batterham, AM.

In: European journal of applied physiology, Vol. 109, No. 6, 01.08.2010, p. 1145-1153.

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@article{9c32254d13054075b7bc1e2ddbc7b93e,
title = "Group- and individual-level coincidence of the 'Fatmax' and lactate accumulation in adolescents",
abstract = "Fatmax and lactate increase above baseline (LIAB) were measured in 11 adolescent girls and 8 adolescent boys during incremental cycling. Fatmax was the exercise intensity at the point of maximal fat oxidation rate (MFO). The LIAB was the exercise intensity coincident with a sustained increase in blood (lactate) above an initial baseline. We defined the minimum important difference (MID) between the exercise intensity at Fatmax and LIAB as +/-8% of both peak (V)over dotO(2) and peak heart rate (HR). Systematic bias was examined via the mean difference between parameters and its uncertainty, with inference based on the disposition of the confidence interval to the MID. Individual-level agreement was the proportion of differences between Fatmax and LIAB falling within the MID. MFO was at 35 (6)% peak (V)over dotO(2) with LIAB at 39 (7)% peak (V)over dotO(2). Systematic bias was -3.8% of peak (V)over dotO(2) and -4.4% of peak HR. The estimated population proportion with between-variable agreement within +/-8% was 0.76 for both % peak (V)over dotO(2) and % peak HR. Within the tolerance limits of the MID, the mean bias is 'almost certainly not' important; similarly, there is good agreement between the two parameters at the individual level. We conclude that Fatmax and lactate increase above baseline coincide in adolescents.",
keywords = "Indirect calorimetry, Exercise intensity, Fat oxidation, Lactic acid, Young people",
author = "K Tolfrey and Asker Jeukendrup and AM Batterham",
year = "2010",
month = aug,
day = "1",
doi = "10.1007/s00421-010-1453-3",
language = "English",
volume = "109",
pages = "1145--1153",
journal = "European journal of applied physiology",
issn = "1439-6319",
publisher = "Springer Verlag",
number = "6",

}

RIS

TY - JOUR

T1 - Group- and individual-level coincidence of the 'Fatmax' and lactate accumulation in adolescents

AU - Tolfrey, K

AU - Jeukendrup, Asker

AU - Batterham, AM

PY - 2010/8/1

Y1 - 2010/8/1

N2 - Fatmax and lactate increase above baseline (LIAB) were measured in 11 adolescent girls and 8 adolescent boys during incremental cycling. Fatmax was the exercise intensity at the point of maximal fat oxidation rate (MFO). The LIAB was the exercise intensity coincident with a sustained increase in blood (lactate) above an initial baseline. We defined the minimum important difference (MID) between the exercise intensity at Fatmax and LIAB as +/-8% of both peak (V)over dotO(2) and peak heart rate (HR). Systematic bias was examined via the mean difference between parameters and its uncertainty, with inference based on the disposition of the confidence interval to the MID. Individual-level agreement was the proportion of differences between Fatmax and LIAB falling within the MID. MFO was at 35 (6)% peak (V)over dotO(2) with LIAB at 39 (7)% peak (V)over dotO(2). Systematic bias was -3.8% of peak (V)over dotO(2) and -4.4% of peak HR. The estimated population proportion with between-variable agreement within +/-8% was 0.76 for both % peak (V)over dotO(2) and % peak HR. Within the tolerance limits of the MID, the mean bias is 'almost certainly not' important; similarly, there is good agreement between the two parameters at the individual level. We conclude that Fatmax and lactate increase above baseline coincide in adolescents.

AB - Fatmax and lactate increase above baseline (LIAB) were measured in 11 adolescent girls and 8 adolescent boys during incremental cycling. Fatmax was the exercise intensity at the point of maximal fat oxidation rate (MFO). The LIAB was the exercise intensity coincident with a sustained increase in blood (lactate) above an initial baseline. We defined the minimum important difference (MID) between the exercise intensity at Fatmax and LIAB as +/-8% of both peak (V)over dotO(2) and peak heart rate (HR). Systematic bias was examined via the mean difference between parameters and its uncertainty, with inference based on the disposition of the confidence interval to the MID. Individual-level agreement was the proportion of differences between Fatmax and LIAB falling within the MID. MFO was at 35 (6)% peak (V)over dotO(2) with LIAB at 39 (7)% peak (V)over dotO(2). Systematic bias was -3.8% of peak (V)over dotO(2) and -4.4% of peak HR. The estimated population proportion with between-variable agreement within +/-8% was 0.76 for both % peak (V)over dotO(2) and % peak HR. Within the tolerance limits of the MID, the mean bias is 'almost certainly not' important; similarly, there is good agreement between the two parameters at the individual level. We conclude that Fatmax and lactate increase above baseline coincide in adolescents.

KW - Indirect calorimetry

KW - Exercise intensity

KW - Fat oxidation

KW - Lactic acid

KW - Young people

U2 - 10.1007/s00421-010-1453-3

DO - 10.1007/s00421-010-1453-3

M3 - Article

C2 - 20376480

VL - 109

SP - 1145

EP - 1153

JO - European journal of applied physiology

JF - European journal of applied physiology

SN - 1439-6319

IS - 6

ER -