Scaling behaviour of [image omitted] in athletes and untrained individuals
Source: Annals of Human Biology, Volume 34, Number 3, May 2007 , pp. 315-328(14)
Publisher: Informa Healthcare
Abstract:Objective: The present study analysed the allometric relationship (MR = a · Mb) between human metabolic rate (MR), ranging from resting to maximal metabolic conditions, and body mass (M ), both in athletes of different specialization and untrained individuals. Subjects and methods: Two hundred and seventy male athletes and 43 untrained men performed a continuous incremental test to volitional exhaustion on a motorized treadmill. Metabolic rate (i.e. [image omitted]) was measured during resting ( [image omitted]), sub-maximal (walking at 5 km h-1 [image omitted]; running at 7.5 km h-1 [image omitted]; ventilatory anaerobic threshold [image omitted]) and maximal exercise conditions (maximum oxygen uptake [image omitted]). Results: A significant difference ( p < 0.001) in the MR-body mass relationships between athletes and controls was found. For the control group, the mass exponent b exhibited a non-significant ( p = 0.37) increase with increasing metabolic demand (b = 0.69, 0.76, 0.76, 0.84, and 0.89, for [image omitted], [image omitted], [image omitted], [image omitted], and [image omitted], respectively). In contrast, the corresponding mass exponent for the athletic group significantly ( p < 0.01) decreased when moving from resting to maximal metabolic conditions (b = 0.98, 0.88, 0.80, 0.69, and 0.67). Conclusion: These results indicate that the recently proposed allometric cascade model may be valid in describing the scaling behaviour of MR in untrained individuals, but not in athletes of different specialization.
Document Type: Research Article
Affiliations: 1: Faculty of Kinesiology, Department of Kinesiology of Sport, University of Zagreb, Croatia 2: Research Institute of Healthcare Sciences, University of Wolverhampton, Walsall, West Midlands, UK
Publication date: May 1, 2007