The Influence of Baseline Metabolic Rate and Exercise Training on Cardio-Respiratory Dynamics


Autoria(s): Da Boit, Mariasole
Contribuinte(s)

Squatrito, Salvatore

Data(s)

03/05/2012

Resumo

Speeding the VO2 kinetics results in a reduction of the O2 deficit. Two factors might determine VO2 kinetics: oxygen delivery to muscle (Tschakovsky and Hughson 1999) and a muscle 'metabolic inertia' (Grassi et al. 1996). Therefore, in study 1 we investigated VO2 kinetics and cardiovascular system adaptations during step exercise transitions in different regions of the moderate domain. In study 2 we investigated muscle oxygenation and cardio-pulmonary adaptations during step exercise tests before, after and over a period of training. Study 1 methods: Seven subjects (26 ± 8 yr; 176 ± 5 cm; 69 ± 6 kg) performed 4 types of step transition from rest (0-50W; 0-100W) or elevate baseline (25-75W; 25-125W). GET and VO2max were assessed before testing. O2 uptake and were measured during testing. Study 2 methods: 10 subjects (25 ± 4 yr; 175 ± 9 cm; 71 ± 12 kg) performed a step transition test (0 to 100 W) before, after and during 4 weeks of endurance training (ET). VO2max and GET were assessed before and after of ET (40 minutes, 3 times a week, 60% O2max). VO2 uptake, Q and deoxyheamoglobin were measured during testing. Study 1 results: VO2 τ and the functional gain were slower in the upper regions of the moderate domain. Q increased more abruptly during rest to work condition. Q τ was faster than VO2 τ for each exercise step. Study 2 results: VO2 τ became faster after ET (25%) and particularly after 1 training session (4%). Q kinetics changed after 4 training sessions nevertheless it was always faster than VO2 τ. An attenuation in ∆[HHb] /∆VO2 was detectible. Conclusion: these investigations suggest that muscle fibres recruitment exerts a influence on the VO2 response within the moderate domain either during different forms of step transition or following ET.

Formato

application/pdf

Identificador

http://amsdottorato.unibo.it/4873/1/Da_Boit_Mariasole_tesi.pdf

urn:nbn:it:unibo-4415

Da Boit, Mariasole (2012) The Influence of Baseline Metabolic Rate and Exercise Training on Cardio-Respiratory Dynamics, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Scienze dello sviluppo e del movimento umano: progetto n. 1 "Discipline delle attività motorie e sportive" <http://amsdottorato.unibo.it/view/dottorati/DOT421/>, 24 Ciclo. DOI 10.6092/unibo/amsdottorato/4873.

Idioma(s)

en

Publicador

Alma Mater Studiorum - Università di Bologna

Relação

http://amsdottorato.unibo.it/4873/

Direitos

info:eu-repo/semantics/openAccess

Palavras-Chave #BIO/09 Fisiologia
Tipo

Tesi di dottorato

NonPeerReviewed