title: Correspondences between continuous and intermittent exercises intensities in healthy prepubescent children.
abstract: The aim of this article is to determine correspondences between three levels of continuous and intermittent exercise (CE and IE, respectively) in terms of steady-state oxygen uptake (VO(2SS)) and heart rate (HR) in children. Fourteen healthy children performed seven exercises on a treadmill: one graded test for the determination of maximal aerobic speed (MAS), three CE at 60, 70 and 80% of MAS (CE60, CE70 and CE80) and three IE (alternating 15 s of exercise intercepted with 15 s of passive recovery) at 90, 100 and 110% of MAS (IE90, IE100 and IE110). Mean VO(2SS) and mean HR were determined for both continuous and intermittent exercises. For comparison, three associations were designed: CE60 versus IE90, CE70 versus IE100 and CE80 versus IE110. No VO(2SS) difference was observed for CE60 versus IE90 and CE70 versus IE100 whereas a significant difference (P < 0.01) was found for CE80 versus IE110 (1.36 +/- 0.45 vs. 1.19 +/- 0.38 L min(-1), respectively). Significant linear regressions were found for the three CE versus IE associations for VO(2SS) (0.60 < r (2) < 0.99, P < 0.05). For the three associations, mean HR presented no significant difference. Only one significant relation was found for CE80 versus IE110 association (r(2) = 0.49, P < 0.05). Correspondences between CE and IE intensities are possible in terms of VO(2SS) whatever the level of exercise; even if for high intensities, VO(2SS) was higher during CE. These results demonstrated that it is possible to diversify the exercise modality while conserving exercise individualization.
authors: Univ Lille Nord de France, 59000, Lille, France.
authors: Benoit
authors: B
authors: Borel
authors: Erwan
authors: E
authors: Leclair
authors: Delphine
authors: D
authors: Thevenet
authors: Laurent
authors: L
authors: Beghin
authors: Serge
authors: S
authors: Berthoin
authors: Claudine
authors: C
authors: Fabre
mesh_terms: D000293:Adolescent; D002648:Child; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance / Q000502:physiology; D005260:Female; D006262:Health; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D010507:Periodicity; D011627:Puberty / Q000502:physiology; D013647:Task Performance and Analysis; D013997:Time Factors