ABSTRACT
Objectives: This work was aimed at investigating, by means of ultrasonography, the influence of training altitudes on haemodynamic parameters of the right heart and the impact of these parameters on the performances of runners participating in endurance races. Experimental Design: This was a cross-sectional study. Place and Duration of the Study: The study was carried out in Cameroon. Echocardiographic parameters were recorded at the Regional Hospital annex of Buea (Cameroon) on the 12th and 13th February while race times were recorded at Molyko Stadium of Buea, on the 15th February 2014. Methodology: Out of 241 runners who finished the senior Mount Cameroon Race of Hope, 68 who were at least at their second participation, had voluntarily participated in the study. Right heart parameters such as the Mid Right Ventricle Diameter (MRVD), the right ventricle Base-To-Apex Length (BAL), the Right Wall Motion (RWM), the Free Wall Thickness (FWT), the tricuspid annular plan systolic excursion (TAPSE) were collected through 2D transthoracic ultrasonography. Mann-Withney or Kruskal-Wallis tests and Spearman’s correlation were used for statistical analysis. The significance level was set at p-value<0.05. Results: Performances improved with the increasing number of participation in the race. From all the above echocardiographic parameters only the values of TAPSE were significantly different (p=0.035), with respect to genders (1.8±0.3 vs. 1.6±0.3 cm/m2, for males and females respectively). The Spearman’s correlation analysis did not show any relationship between training altitude and MRVD (r=-0.19; p=0.19), TAPSE (r=0.14; p=0.35) or FWT (r=-0.04; p=0.77). However, there was a correlation, although weak, between training altitude and BAL (r=-0.33; p=0.02). BAL decreased as training altitude was getting higher. None of these haemodynamic parameters seemed to impact the performances of runners. Conclusion: The training altitudes can impact right ventricle BAL, but not TAPSE and the latter is affected by gender. However, these parameters seem not to impact the performances of high altitude endurance runners.
ABSTRACT
Aim: This work was aimed at determining the influence of nutritional status on physical aptitudes and cardiovascular profiles of children in rural and urban areas of North Cameroon. Experimental Design: The study was a cross-sectional survey. Place and Duration of Study: The study was carried out in Cameroon from February to March 2014. Methodology: Overall, 633 children aged 6-17 years were enrolled into the study. Demographic information was recorded. Weight, height, cardiovascular profiles [heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP)] and physical aptitudes [six minutes walk (6MWT), broad jump (BJ), 30 m dash] were evaluated. Results: Prevalence values of malnutrition and hypertension were 3.3% and 0.31% respectively. HR was significantly higher in males (P<0.001), children aged 6-10 years (P=0.001) and those from urban areas (P<0.001) when compared with their respective counterparts. DBP was significantly higher in children aged >10years (P=0.01) and normonourished children (P=0.014) than their respective counterparts. SBP was higher in children aged >10 years than those aged 6-10 years and the difference was significant (P<0.001). The mean 6MWT and mean BJ were significantly higher (P<0.001) in children aged >10 years and those from rural areas (P<0.001) than their respective counterparts. The mean time taken to do the 30 m dash was significantly higher (P = 0.001) in children from rural areas (6.15±0.06 sec), than those from urban areas (5.86±0.22 sec). There was a negative correlation between the HR and mean BJ (P<0.001), HR and mean 6MWT (P <0.001), SBP and mean time for 30 m dash (P <0.001), DBP and 30 m dash (P<0.001) in the normonourished children. There was a positive correlation between HR and 30 m dash (P<0.001), SBP and BJ (P<0.001) as well as DBP and BJ (P<0.001) in normonourished children. Conclusion: A weak correlation was registered between the nutritional status, physical and cardiovascular parameters of the school children.