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Effect of ramadan fasting on the sympathovagal balance through a study of heart rate variability

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par Mohamed EL Amine FANNANI
High Institute of Sport and Physical Education of Sfax / TUNISIA - Master degree in Sciences and technique of physical and sport activities.  2011
  

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III.1. Effect of Ramadan fasting on the sympathetic system III.1.1. LF (ms2)

LF (ms2)

400

600 Supine Standing Effort

P.cou P.debou P.l'effo

500

300

200

100

0

*

a

b

*

a

b

Figure 3: Mean (#177; SD) LF (ms2) values recorded during the second, fourth week and before Ramadan (n = 9).

* (p <0.05) Significant difference from before Ramadan (supine position);

a (p <0.05) Significant difference from before Ramadan (standing position); b (p <0.05) Significant difference from before Ramadan (During effort).

· Supine position: the analysis of the variance shows a significant effect F (2) = 12.67; p <0.05 Ramadan fasting on the mean values LF (ms2) (Figure 3).

The post hoc analysis shows that the LF values recorded before Ramadan are significantly higher than those measured in the middle and at the end of the month of fasting P <0.05.

· Standing position: The analysis of the variance shows a significant effect F (2) = 12.22, p <0.05 Ramadan fasting on the mean values LF (ms2) (Figure 3).

The post hoc analysis shows that the LF values recorded before Ramadan, when standing, are significantly higher than those measured in the middle and at the end of the month of fasting p <0.05.

· 40

During effort: The analysis of the variance shows a significant effect F (2) = 11,52; p <0.05 Ramadan fasting on mean values LF (ms2) after exercise (Figure 3).

The post hoc analysis shows that the LF values recorded before Ramadan, during exercise, are significantly higher than those measured in the middle and at the end of the month of fasting (P <0.05).

III.1.2. LF (nu)

LF (nu)

100

40

90

80

70

60

50

30

20

10

0

a b

b

Figure 4: Mean (#177; SD) LF (nu) values recorded during the second, fourth week and before Ramadan (n = 9).

* (p <0.05) Significant difference compared to before Ramadan (supine position); a (p <0.05) Significant difference compared to before Ramadan (standing position); b (p <0.05) Significant difference compared to before Ramadan (During effort).

· Supine position: The Analysis of the variance shows a significant effect F (2) = 11.66; P <0.05 Ramadan fasting on mean values LF (nu) (Figure 4).

The post hoc analysis shows that the LF values recorded before Ramadan, in supine position are significantly higher than those measured in the middle and at the end of Ramadan (P <0.05).

· Standing position: The analysis of the variance shows a significant effect F (2) = 11,23; P <0.05 of Ramadan fasting on the mean LF values (Figure 4).

41

The post hoc analysis shows that the LF values recorded before Ramadan, while standing, are significantly higher than those measured in the middle and at the end of the month of Ramadan (P <0.05).

· During effort: The analysis of the variance shows a significant effect F (2) = 10.55; P <0.05 of Ramadan fasting on mean values LF (nu) (Figure 4).

The post hoc analysis shows that the LF values recorded before Ramadan, during the effort, are significantly higher than those measured in the middle and at the end of the month of Ramadan (P <0.05).

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