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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2002 June;42(2):135-40

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

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.

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