Total amount: € 0,00
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
EXERCISE PHYSIOLOGY AND BIOMECHANICS
Brown J. D., Mahon A. D., Plank D. M.
From the Human Performance Laboratory Ball State University Muncie, IN, USA
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.