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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Original articles EXERCISE PHYSIOLOGY AND BIOMECHANICS
The Journal of Sports Medicine and Physical Fitness 2004 December;44(4):383-8
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
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.