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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2004 December;44(4):383-8

language: English

Running performance in middle-school runners

Malison E. R., Plank D. M., Brown J. D., Cheatham C. C., Mahon A. D.

Human Performance Laboratory Ball State University, Muncie, IN, USA


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Aim. This study examined the relationship of 3-km run time to indices of aerobic and anaerobic ability in 9 male runners (13.4±0.6 years, mean±SD).
Methods. Anthropometric measurements were made, and an exercise test to determine running economy at 187 m·min-1 and V.O2max were assessed on a treadmill. On a separate day, 2 55-m sprints followed by a 3-km run were performed on a 200-m indoor track. Capillary blood samples were obtained from a finger tip immediately after the run to determine blood lactate level. Fractional utilization (%V.O2max used during the 3-km run) was calculated. Correlations were used to examine the relationship between run time and the physiological measurements.
Results. Mean values for V.O2, HR and RER at maximal exercise were 61.7±4.4 ml·kg-1·min-1, 198.9±6.7 b·min-1, and 1.16±0.04, respectively. The average time to run 3 km was 13.27±0.97 min (90.1±7.2% of V.O2max). Post-run blood lactate level was 8.3±3.2 mmol·L-1 and was significantly related (r=-0.73, p=0.02) to 3-km time. Fractional utilization tended to be related (r=-0.56, p=0.12) to time.
Conclusion. In this age group the ability to run at a high percentage of V.O2max and tolerate a high blood lactate appear to be important determinants of running performance in young male runners.

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