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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 2002 Giugno;42(2):135-40
Attainment of maximal exercise criteria in boys and men
Brown J. D., Mahon A. D., Plank D. M.
From the Human Performance Laboratory Ball State University Muncie, IN, USA
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Background. This study tested the hypothesis that the occurrence of a V.O2 plateau at maximal exercise would be greater in men versus boys. Secondary indicators of maximal effort also were examined.
Methods. Sixteen boys (10.7±0.6 yrs) and 21 men (22.5±2.0 yrs) performed a graded exercise test on a treadmill at a constant speed of 8.04 km . hr-1 with 2.5% increments in elevation. The men also performed a second test at 11.26 km . hr-1 with similar increases in slope.
Results. At 8.04 km . hr-1, V.O2max was 52.3±6.0 and 52.5±5.1 ml . kg-1 . min-1 in boys and men, respectively (p>0.05). In the men, V.O2max (53.3±5.4 ml . kg-1 . min-1) was higher (p<0.05) in the faster protocol. The percentage of men achieving the criterion was nearly double the percentage of boys (23.8 vs 12.5%), although the difference was not significant. Age-specific criteria heart rate (HR) and respiratory exchange ratio (RER) were achieved in a similar manner; however, more men (100%) than boys (86.7%) achieved an age-specific blood lactate (BLa) criterion (p<0.05). Plateau achievement increased to 33.0% in the 11.26 km . hr-1 protocol, but was not significantly different from 8.04 km . hr-1. HR, RER and BLa criteria achievement were comparable.
Conclusions. Maturation may influence the achievement of a plateau and BLa criteria, but not age-specific criteria for RER or HR.