caa a22 4500 467941661 CHVBK 20180406153014.0 cr unu---uuuuu 170328e20060501xx s 000 0 eng 10.1007/s00421-006-0137-5 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0137-5 The energy cost of cycling in young obese women [Elektronische Daten] [Claudio Lafortuna, Marco Proietti, Fiorenza Agosti, Alessandro Sartorio] In order to evaluate the difference in the energy cost of submaximal cycling between normal weight (NW) and obese (OB) females, nine OB (age 23.2years±1.6 SE, BMI 40.4±1.2kg/m2) and nine NW (age 25.6years±1.8, BMI 21.7±0.6kg/m2) healthy young women were studied during a graded bicycle ergometer test at 40, 60, 80, 100 and 120W. At rest and at all workloads, oxygen uptake $$(\dot{V}{\text{O}}_{2})$$ was higher in OB than in NW women (Student's t test, P<0.05-0.01), as well as respiratory quotient during all exercise levels (P<0.05-0.01), while similar values of heart rate, pulmonary ventilation and breathing efficiency were found between the two groups. Maximal $$\dot{V}{\text{O}}_{2}$$ and anaerobic threshold were higher in OB women, and they also explained the higher oxygen pulse observed during submaximal exercise, but no difference was found when the values were adjusted for fat-free mass. While net mechanical efficiency (ME) was significantly lower in OB (ANOVA, P<0.05), delta ME was similar in both groups, indicating no substantial derangement of muscle intrinsic efficiency in obesity, but suggesting that the increased mass of body segments involved in cycling movements may be chiefly responsible for the higher energy cost of this type of exercise. Comparison of the actual $$\dot{V}{\text{O}}_{2}$$ presently measured with that predicted by available cycle ergometry equations at the different workloads indicated inaccuracy of various degrees ranging from 8.4 to −31.9%. It is concluded that the lower mechanical efficiency displayed by obese women in cycling has to be taken into account when prescribing exercise through methods predicting the metabolic load. Springer-Verlag, 2006 Bicycle ergometer nationallicence Exercise nationallicence Oxygen uptake nationallicence Mechanical efficiency nationallicence Obesity nationallicence Lafortuna Claudio Istituto di Bioimmagini e Fisiologia Molecolare del Consiglio Nazionale delle Ricerche, via Cervi, 93, 20090, Segrate, Milano, Italy aut Proietti Marco Laboratorio Sperimentale di Ricerche Endocrinologiche, Istituto Auxologico Italiano, IRCCS, Milano, Italy aut Agosti Fiorenza Laboratorio Sperimentale di Ricerche Endocrinologiche, Istituto Auxologico Italiano, IRCCS, Milano, Italy aut Sartorio Alessandro Laboratorio Sperimentale di Ricerche Endocrinologiche, Istituto Auxologico Italiano, IRCCS, Milano, Italy aut European Journal of Applied Physiology Springer-Verlag 97/1(2006-05-01), 16-25 1439-6319 97:1<16 2006 97 421 https://doi.org/10.1007/s00421-006-0137-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0137-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lafortuna Claudio Istituto di Bioimmagini e Fisiologia Molecolare del Consiglio Nazionale delle Ricerche, via Cervi, 93, 20090, Segrate, Milano, Italy aut NATIONALLICENCE 700 1- Proietti Marco Laboratorio Sperimentale di Ricerche Endocrinologiche, Istituto Auxologico Italiano, IRCCS, Milano, Italy aut NATIONALLICENCE 700 1- Agosti Fiorenza Laboratorio Sperimentale di Ricerche Endocrinologiche, Istituto Auxologico Italiano, IRCCS, Milano, Italy aut NATIONALLICENCE 700 1- Sartorio Alessandro Laboratorio Sperimentale di Ricerche Endocrinologiche, Istituto Auxologico Italiano, IRCCS, Milano, Italy aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/1(2006-05-01), 16-25 1439-6319 97:1<16 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer