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Acta Physiologica Congress

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Acta Physiologica 2011; Volume 203, Supplement 686
Joint Congress of FEPS and Turkish Society of Physiological Sciences
9/3/2011-9/7/2011
Istanbul, Turkey


EFFECTS OF WORK LOAD INTENSITY ON BODY METABOLISM AND SUBSTRATE UTILISATION DURING MUSCULAR EXERCISE PERFORMANCE
Abstract number: PC215

Ura1 Seda, Yilmaz2 Bayram, Serhatlioglu1 Ihsan, Aslan1 Nida, Ozcelik1 O[gbreve]uz

1Frat University, Faculty of Medicine, Deparment of Biophysics (Physiology)
2Yeditepe University, Faculty of Medicine, Deparment of Physiology

Objective: 

Body substrate utilisations at anaerobic threshold (AT), which describes the changes in body metabolic system from aerobic to anaerobic, and at critical power (CP) outputs, which describes the highest sustainable work rate, was examined comparatively in sedentary male subjects.

Methods: 

Six subjects performed 6 different exercise tests after giving signed written informed contents which were approved by the local ethical committee. They initially performed an incremental exercise test (15 W/min) to estimation of AT and maximal exercise capacity (Wmax) using cycle ergometer. Each subject performed 5 different constant load exercise tests (30 min): work load corresponded to 25% below AT (46% of Wmax), at the AT (62% of Wmax), at the CP (72% of Wmax), at the 25% above AT (77% of Wmax), and at 100% above AT (122% of Wmax). Ventilatory and pulmonary gas exchange parameters were evaluated breath-by-breath. Metabolic changes were determined using respiratory quotient (RQ). AT was estimated using V-Slope method and CP was by other conventional methods. A paired t- test was used to evaluate values.

Results: 

Fat oxidation ratio was higher in CP (0.92±0.01) than AT (0.95±0.01) and 25% below AT (0.95±0.005) (p<0.05). RQ was systematically increased work load at the 25% above AT (1.04±0.02) and at 100% above AT (1.55±0.05).

Conclusions: 

Interestingly, increasing exercise intensity (from 25% below to AT to CP) caused increases in fat oxidation ratio. However, work load intensity above the CP results in increases carbohydrate oxidation rate due to the anaerobic glycolysis. Increases in fat oxidation at the work load at corresponded to CP could be an important training protocol for clinical medicine.

To cite this abstract, please use the following information:
Acta Physiologica 2011; Volume 203, Supplement 686 :PC215

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