Respiratory and locomotor muscle implications on the VO2slow component and the VO2excess in young trained cyclists.
We investigated the impact of ramp and constant-load exercise on (i) respiratory muscle fatigue and locomotor muscle oxygenation, (ii) their relationship with the excess VO2and VO2slow component (SC). Fourteen male cyclists performed two tests to exhaustion: an incremental ramp and a constant-load exercise with continuous monitoring of expired gases and oxygenation of the vastus lateralis muscle on two separate days. Maximal inspiratory (MIP) and expiratory (MEP) pressure measurements were taken at rest and post- exercise. The VO2excess represents the difference between VO2maxobserved and VO2maxexpected using linear equation between the VO2and the intensity before gas-exchange threshold. During the ramp exercise, MIP and MEP declined by 13±8 and 19±10%, respectively (p<0.05). MIP and MEP were not correlated to the excess VO2(0.09±0.05lmin-1). During the constant-load exercise, the VO2SC (0.70±0.22lmin-1) was correlated (r=0.68, p<0.01) to deoxyhemoglobin SC (2.94±1.25AU) but not to the excess VO2(r=0.30, p=0.2). Additionally, the significant decrease in MIP (20±9%) and MEP (23±11%) was correlated (r=0.55, p<0.05 and r=0.75, p<0.05, respectively) to the VO2SC. Our results show that respiratory muscle fatigue was correlated to the VO2SC in the constant-load exercise, whereas it was not correlated to the excess VO2in ramp exercise may be because of our small excess VO2.
EA-3300: APERE, Sport Sciences Department, University of Picardie Jules Verne, Amiens, France; UR12ES06, Medicine Department, University of Sousse, Sousse, Tunisie; Faculty of Sciences, University of Carthage, Bizerte, Tunisie. Electronic address: oueslati.ferid@hotmail.com.
Ferid
F
Oueslati
Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium.
Jan
J
Boone
UR12ES06, Medicine Department, University of Sousse, Sousse, Tunisie.
Zouhair
Z
Tabka
EA-3300: APERE, Sport Sciences Department, University of Picardie Jules Verne, Amiens, France.
Said
S
Ahmaidi
D000293:Adolescent; D000704:Analysis of Variance; D001642:Bicycling / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology; D002245:Carbon Dioxide / Q000378:metabolism; D004576:Electromyography; D005080:Exercise Test; D006339:Heart Rate / Q000502:physiology; D006454:Hemoglobins / Q000378:metabolism; D006801:Humans; D008124:Locomotion / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology*; D012119:Respiration; D019265:Spectroscopy, Near-Infrared
D006454:Hemoglobins; D002245:Carbon Dioxide
Exercise; Nirs; Oxygen uptake; Respiratory muscle strength