Modification of the spontaneous seat-to-stand transition in cycling with bodyweight and cadence variations |
| |
| Institution: | 1. LAAS, CNRS, University of Toulouse, France;2. PRISSMH-LAPMA, University of Toulouse, France;3. Department of Neuroscience, University of Montreal, QC, Canada;4. Center for Interdisciplinary Research in Rehabilitation of Greater Montreal (CRIR), Montreal, QC, Canada;1. INRA UR0050, Laboratoire de Biotechnologie de l’Environnement, Avenue des Etangs, Narbonne 11100, France;2. INRIA, BIOCORE, 2004 Route des Lucioles, Sophia-Antipolis 06250, France;3. LOV-UPMC-CNRS, UMR 7093, Station Zoologique, B.P. 28, Villefranche-sur-mer 06234, France;1. CEA, The French Alternative Energies and Atomic Energy Commission, DRF//IRFM/SI2P/GSCP, CEA Cadarache, 13108 Saint Paul-Lez-Durance, France;2. ONERA-The French Aerospace Lab, 31055 Toulouse, France;3. CNES, The French National Centre for Space Studies, DCT/RF/HT, 31000 Toulouse, France;4. LNCMI, Intense Magnetic Fields Laboratory, 31400 Toulouse, France;1. Université de Lyon, CNRS, LIRIS, UMR5205, F-69622, France;2. Université de Lorraine, CNRS, LORIA, UMR7503, Vandœuvre-lès-Nancy F-54506, France;1. Université de Toulouse, UPS, INSA, LMDC, 135 Avenue de Rangueil, F-31077 Toulouse Cedex 04, France;2. DEN/DSN/SEEC/LECD, Bât.326, CEA Cadarache, 13108 Saint Paul Lez Durance, France;1. Federal University of Paraná, Department of Environmental Engineering, Curitiba, Paraná 81531-980, Brazil;2. Université de Toulouse, UPS, INSA, LMDC (Laboratoire Matériaux et Durabilité des Constructions), 135, avenue de Rangueil, F-31 077 Toulouse Cedex 04, France;3. Duke University, Department of Mechanical Engineering and Materials Science, Durham, NC 27708-0300, USA |
| |
| Abstract: | When a high power output is required in cycling, a spontaneous transition by the cyclist from a seated to a standing position generally occurs. In this study, by varying the cadence and cyclist bodyweight, we tested whether the transition is better explained by the greater power economy of a standing position or by the emergence of mechanical constraints that force cyclists to stand.Ten males participated in five experimental sessions corresponding to different bodyweights (80%, 100%, or 120%) and cadences (50 RPM, 70 RPM, or 90 RPM). In each session, we first determined the seat-to-stand transition power (SSTP) in an incremental test. The participants then cycled at 20%, 40%, 60%, 80%, 100%, or 120% of the SSTP in the seated and standing positions, for which we recorded the saddle forces and electromyogram (EMG) signals of eight lower limb muscles. We estimated the cycling cost using an EMG cost function (ECF) and the minimal saddle forces in the seated position as an indicator of the mechanical constraints.Our results show the SSTP to vary with respect to both cadence and bodyweight. The ECF was lower in the standing position above the SSTP value (i.e., at 120%) in all experimental sessions. The minimal saddle forces varied significantly with respect to both cadence and bodyweight.These results suggest that optimization of the muscular cost function, rather than mechanical constraints, explain the seat-to-stand transition in cycling. |
| |
| Keywords: | Pedaling Transition Optimization Cost-function Saddle force Performance |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
