Daily physical activity levels in preadolescent boys related to $$\dot V_{O_{2max} } $$ and lactate threshold

Atomi, Yoriko; Iwaoka, K.; Hatta, Hideo; Miyashita, Masaki; Yamamoto, Yoriko

doi:10.1007/bf00714998

Cited by 40 publications

(13 citation statements)

References 17 publications

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“…The black shaded areas are those differences that were within the MID of ±8% peak _ VO 2 : The white bar represents the group mean systematic bias of -3.8% peak _ VO 2 above an initial baseline commonly used in adult-based studies and in our own work. The LIAB for the boys in our study is considerably lower than the 'lactate threshold' reported by Atomi et al (1986) for 11-year-old boys using the same criteria to define this parameter (71 vs. 39% peak _ VO 2 ). It should be noted that the absolute lactate concentration at the 'lactate threshold' was 1.60 mmol L -1 (Atomi et al 1986) which is also much higher than the baseline value of 0.98 mmol L -1 at which the LIAB was identified in our study.…”

Section: Discussioncontrasting

confidence: 56%

“…The LIAB for the boys in our study is considerably lower than the 'lactate threshold' reported by Atomi et al (1986) for 11-year-old boys using the same criteria to define this parameter (71 vs. 39% peak _ VO 2 ). It should be noted that the absolute lactate concentration at the 'lactate threshold' was 1.60 mmol L -1 (Atomi et al 1986) which is also much higher than the baseline value of 0.98 mmol L -1 at which the LIAB was identified in our study. The % peak _ VO 2 at 1.60 mmol L -1 for the participants in our study would still have been lower than Atomi's, but the difference would have been very much smaller.…”

Section: Discussioncontrasting

confidence: 56%

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

2010

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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 VO2 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 VO2 with LIAB at 39 (7)% peak VO2 Systematic bias was -3.8% of peak VO2 and -4.4% of peak HR. The estimated population proportion with between-variable agreement within +/-8% was 0.76 for both % peak VO2 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.

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Section: Discussioncontrasting

confidence: 56%

Section: Discussioncontrasting

confidence: 56%

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

2010

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“…Only a few studies in children and adolescents have calibrated the subjects in relation to their individual VO 2 ± HR regression lines (Verschuur & Kemper, 1985;Atomi et al, 1986;Riddoch et al, 1991;Livingstone et al, 1992;Emons et al, 1992;Ekelund et al, 1999). Despite the fact that HR is affected by emotional status, temperature, day to day variation and type of work performed, validation studies using the DLW method in children and adolescents have shown that minby-min HR monitoring produced similar results for TDEE in groups of children and adolescents with various levels of physical activity (Livingstone et al, 1992;Maffeis et al, 1995;van den Berg-Emons et al, 1996).…”

Section: Methodsmentioning

confidence: 99%

Total daily energy expenditure and pattern of physical activity measured by minute-by-minute heart rate monitoring in 14–15 year old Swedish adolescents

et al. 2000

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Objective: To assess total daily energy expenditure (TDEE) and patterns of physical activity among Swedish male and female adolescents and to relate the amount and intensity of physical activity to existing recommendations (energy expenditure equal to or above 12.4 kJakgaday or accumulation of 30 minaday in moderate physical activity equal to 4.5 times sedentary energy expenditure or more). Design: TDEE, physical activity level (PAL TDEEaBMR), energy expenditure (EE) and time spent in different intensities of physical activity were assessed by using minute-by-minute heart rate monitoring in combination with laboratory measured sedentary energy expenditure (SEE) and peak oxygen uptake. Setting:

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“…Although not adirect measure of physical activity, heart rate (HR) monitoring is one of the most frequently used methods for assessing physical activity in children and adolescents (Atomi et al 1986;Armstrong et al 1990; Armstrong and Bray 1991;Riddoch et al 1991;Livingstone et al 1992;Janz et al 1994;Gilbey and Gilbey 1995;Gavarry et al 1998;Ekelund et al 1999Ekelund et al , 2000. To quantify the amount and patterns of physical activity in children and adolescents, dierent approaches have been used to identify the HR corresponding to dierent intensities of physical activity.…”

Section: Introductionmentioning

confidence: 99%

Heart rate as an indicator of the intensity of physical activity in human adolescents

Ekelund

Poortvliet

Yngve

et al. 2001

European Journal of Applied Physiology

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The aims of this study were, in a group of adolescents, firstly to identify the absolute heart rates (HR) and the percentages of maximal heart rates (HRmax) corresponding to 40%, 60% and 80% of peak oxygen uptake (PVO2), secondly to identify absolute and relative (%PVO2) oxygen uptakes (VO2) corresponding to HR of 120, 140 and 160 beats.min-1, and thirdly to examine a possible effect of fatness and fitness on the relationship between HR and VO2. The subjects were 127 (60 boys, 67 girls) adolescents with a mean age of 14.8 (SD 0.3) years. The HR and VO2 were measured by means of an incremental exercise test to exhaustion. Linear regressions were performed for the HR-VO2 and VO2-HR relationships using absolute and relative (%HRmax, %PVO2) data for each individual. From these regressions, target HR and VO2 were computed. Average target HR corresponding to 40%, 60% and 80% of PVO2 were: 119 (SD 9), 145 (SD 9), 171 (SD 8), and 120 (SD 10), 146 (SD 8), 172 (SD 8) beats.min-1 for boys and girls, respectively. Average VO2 corresponding to HR of 120, 140 and 160 beats.min-1 were: 22 (SD 5), 30 (SD 5), 38 (SD 6) and 18 (SD 4), 24 (SD 4), 31 (SD 4) mlO2.kg-1.min-1 for boys and girls, respectively. An analysis of covariance showed a significant fitness effect (P < 0.001) for predicted VO2 at all HR studied. The results suggest that the use of absolute HR to define exercise intensity levels when assessing young people's physical activity using HR monitoring detracts from the validity of the interpretation of the data.

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Daily physical activity levels in preadolescent boys related to $$\dot V_{O_{2max} } $$ and lactate threshold

Cited by 40 publications

References 17 publications

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

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

Total daily energy expenditure and pattern of physical activity measured by minute-by-minute heart rate monitoring in 14–15 year old Swedish adolescents

Heart rate as an indicator of the intensity of physical activity in human adolescents

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