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Biomedical subjects

H Gökbel

Publications and source records attributed to H Gökbel.

8 recordsLinked to original sources
PubMed1999

Basal metabolic rates of Turkish women during pregnancy.

The purpose of the present study was to investigate the basal metabolic rates (BMRs) of pregnant Turkish women and to compare them with values from other countries. Twenty-four pregnant women (aged 24.8+/-5.7 years) were studied longitudinally from early pregnancy through to the end of pregnancy. BMR values were measured in the 1st, 2nd and 3rd trimesters by indirect calorimetry. While the measured BMR significantly increased (279+/-212 kcal/day between the 1st and 3rd trimesters), no change was found when BMR was expressed per unit of body weight. BMR in the 2nd and 3rd trimesters showed a significant correlation with body weight. The BMR increase in pregnant Turkish women was close to that reported in developed countries, and higher than that reported in developing countries. Knowing the metabolic changes of the pregnant women may contribute to dietary recommendations for them.

Adipose Tissue↗
PubMed1999

A combined method for estimating ventilatory threshold.

BACKGROUND: The aims of this study were to compare two new methods (Dmax and CUSUM) for determination of the ventilatory threshold and to examine the consequences of estimation by application of these methods in combination. METHODS EXPERIMENTAL DESIGN: a comparative design was used. SETTING: the study was performed in the Exercise Physiology Laboratory in the Faculty of Medicine, Selçuk University. PARTICIPANTS: thirty-two untrained males (20.6 +/- 1.2 yrs) performed an incremental exercise test on a cycle ergometer. INTERVENTIONS: there is no intervention. MEASURES: ventilatory and gas exchange variables were measured breath-by-breath. The ventilatory thresholds were detected by conventional linear regression, CUSUM, Dmax and combined CUSUM-Dmax methods. RESULTS: The ventilatory thresholds determined by Dmax method gave the highest r-values compared to the criterion method. There was no statistical difference between thresholds determined by all methods or by the same method using different variables. Ventilatory thresholds could not be determined by the conventional linear regression method in three subjects but were determined in all subjects by the other three methods. CONCLUSIONS: Although all methods presented in this study can be used in the determination of ventilatory threshold, the Dmax method was found to be the most valid one. When using the CUSUM method, combining it with the Dmax method increases the validity of the measurement.

Adult↗
PubMed1999

Exercise-induced bronchospasm in nonasthmatic obese and nonobese boys.

BACKGROUND: In this study it was aimed to compare the degree and frequency of exercise-induced bronchospasm (EIB) in nonasthmatic obese boys with those in nonasthmatic nonobese boys. METHODS PARTICIPANTS: Fifty boys (24 obese and 26 control), aged 11 to 15 years, with no history of asthma or other atopic diseases, took part in the study. MEASURES: Anthropometric measurements and spirometry were performed at rest and spirometry was repeated at 5 and 15 minutes after an eight-minute submaximal exercise on cycle ergometer. RESULTS: The falls in ratio of forced expiratory volume in one second (FEV1) to forced vital capacity (FVC) and expiratory rates at 5 and 15 minutes after the exercise were significant in obese boys. Only significant change was the fall in FEV1/FVC at 5th minutes in controls. There was no significant difference between obese group and controls in the number of EIB-positive cases. Pulmonary function changes after the exercise had significant negative correlation with body mass index, subscapular and biceps skinfolds. CONCLUSIONS: Since the fall in pulmonary function was severe in obese boys and these falls were correlated with body mass index and skinfolds, it is concluded that diagnosis and management of EIB may improve aerobic exercise performance and participation in obese children.

Adolescent↗
PubMed1998

Pulmonary function of workers in the aluminum industry.

The effects of aluminum on the pulmonary function of aluminum workers were investigated in this study. Serum aluminum levels and spirometry were measured in 55 male workers and 30 male controls. The mean serum aluminum level of workers (72.7 +/- 9.9 ng/ml) was significantly high compared to that of controls, indicating aluminum toxicity. Spirometric parameters were significantly lower in workers than in controls and correlated negatively with both exposure time and serum aluminum levels. The impairment in pulmonary function may be due to exposure time and insufficient protection.

Adult↗
PubMed1998

Comparison of the aerobic contributions to Wingate anaerobic tests performed with two different loads.

BACKGROUND: The purpose of the present study was to compare the aerobic contribution of the Wingate anaerobic test by increasing the test load and power output. METHODS SETTING: The study was performed in the Physiology Department of the Faculty of Medicine, Selçuk University. PARTICIPANTS: Thirty sedentary male university students volunteered to this study. EXPERIMENTS: The subjects performed two Wingate tests against resistance of 75 g.kg-1 and 95 g.kg-1 body weight on Monark 818E bicycle ergometer. Breath-by-breath oxygen consumption rates were measured using an automated metabolic measurement chart (Sensormedics 2900). Aerobic contribution was determined by dividing energy equivalence of net oxygen consumption to the total work. RESULTS: The mean total work values obtained from tests performed at 75 g.kg-1 and 95 g.kg-1 loads were 13.9 +/- 1.5 kjoules and 14.5 +/- 1.8 kjoules (t = 2.32, p = 0.03). Mean total oxygen consumptions were 765 +/- 105 ml and 770 +/- 110 ml, respectively (t = 0.24, p = 0.81). Assuming 20% mechanical efficiency for both tests, aerobic contributions were calculated as 19.5 +/- 3.7% and 18.9 +/- 3.7%, respectively (t = 1.01, p = 0.30). CONCLUSIONS: Although the power outputs of the two tests were different, the difference between aerobic contributions was not statistically significant. So, it was failed to say that the increase in the power outputs might be related to higher contribution of anaerobic processes. However, if different mechanical efficiencies could be used, relationship between aerobic contributions of two tests might have been different.

Adult↗
PubMed1996

Determination of the heart rate deflection point by the Dmax method.

OBJECTIVE: Conconi et al. proposed that the point where heart rate departed from linearity in an incremental exercise test was a good indicator of the anaerobic threshold. However, the heart rate deflection points (HRDPs) can not be determined in many subjects. The aim of this study was to determine the heart rate deflection point by the Dmax method and to compare it with the conventional linear method. SETTING: The study was performed in the Exercise Physiology Laboratory in the Faculty of Medicine, Selçuk University. PARTICIPANTS: Thirty-two untrained males (aged 18-22) performed a maximal exercise test on a cycle ergometer. RESULTS: The deflection from linearity of HR could not be detected in nine subjects (28%) by the linear method. The HRDPs could be detected in all subjects by the Dmax method. It was observed that the HR values in the HRDPs determined by both methods were close to the maximal HR values (approximately 90% of maximum). There were high correlations and no differences (p more than 0.05) between the deflection points expressed as oxygen uptake, HR and work rate determined by two methods (correlation coefficients 0.93, 0.93, 0.97, respectively, p less than 0.001). CONCLUSIONS: The Dmax method is more useful than linear method. The HRDPs of all the people can easily and objectively be found by this method.

Adolescent↗
PubMed1996

The effects of rHuEPO administration on pulmonary functions in haemodialysis patients.

The aim of this study was to investigate the effects of erythropoietin therapy on pulmonary functions in haemodialysis patients. Thirteen patients with chronic renal failure on regular haemodialysis and in need of treatment for anaemia were treated with 45-60 U/kg erythropoietin three times a week. Thirteen haemodialysis patients constituted the control group. Patients receiving erythropoietin were given pulmonary function tests prior to the treatment and after Hb levels had reached 10 g/dl. The interval between first and second pulmonary function tests was similar for both the control group and the erythropoietin group. There was no significant difference between the results of the first and the second pulmonary function tests of the control group. However, in the erythropoietin group, the diffusing capacity, maximal voluntary ventilation, forced vital capacity and peak expiratory flow rate values increased significantly. The existence of a relationship between the diffusing capacity and anaemia is well known. Rises in other parameters following erythropoietin administration might be the result of a gain in respiratory muscle strength consequent to anaemia correction.

Adult↗