الإنتاج البحثي لأعضاء هيئة التدريس بالكلية V.8 - Flipbook - Page 162
and aerobic indicators as well the homeostasis model assessment index for insulin resistance index
(HOMA-IR) were assessed at baseline and after SET. The low- and high-frequency [(LF (0.03–
0.15 Hz) in ms2 and HF (0.15–0.4 Hz) in ms2)] analysis of HRV as well as adrenaline (A in nmol/l)
and noradrenaline (NA in nmol/l) responses were assessed at resting condition and during
ventilatory threshold 1 (VT1) of a graded maximal test at baseline and after SET. At baseline,
resting HF, LF and the LF/HF ratio were different among groups (P < 0.01, respectively) and were
significantly associated with waist-to-hip ratio (β = −0.26; p = 0.01, β = −0.12; p = 0.01 and, β =
0.21; p = 0.01). During exertion at VT1, only LF/HF ratio was associated with NA responses (β =
0.23; p = 0.01). After SET, the frequency domain marker improved significantly for both groups
in comparison to baseline. These improvements are manifested by LF and HF increases and LF/HF
ratio decreases in the rest condition (p < 0.01, respectively) and during exertion at VT1 (p < 0.01,
respectively). The improvement in LH and HF were associated with VO2max increases (β = 0.22 p
= 0.01 and β = 0.33; p = 0.01). The decreases observed for the LF/HF ratio are mainly associated
to NA decreases observed at rest (β = 0.31; p = 0.001) and at VT1 (β = 0.38; p = 0.001). Obese
adults have altered HRV, and 6 weeks of SET improves HRV variables at rest and during VT1
exertion. While LF and HF improvement were associated with VO2max increases, the LF/HF ratio
was mainly associated with noradrenaline decreases observed at rest and at VT1.
(10) Jabbour, G., Iancu, HD. (2021). Comparison of performance and health indicators between
perimenopausal and postmenopausal obese women: the effect of high-intensity interval training
(HIIT). Menopause 28(1):50-57. https://doi.10.1097/GME.0000000000001654
This study examined the effects of 6 weeks of high-intensity interval training (HIIT) on
performance and health indicators in obese perimenopausal (PERIM) women and similarly aged
and older postmenopausal women (POSTM1 and POSTM2, respectively).
Sixteen PERIM women (average age 49.6 y), 21 POSTM1 women (average age 50.6 y), and 19
POSTM2 women (average age 69.6 y) completed a 6-week HIIT intervention. Anthropometric
parameters, mechanical efficiency (ME in %), lipid oxidation (LO in %), and low and high spectral
frequencies (LF[ms2] and HF[ms2]) were computed pre- and postintervention.ERIM women
showed a significantly higher VO2max preintervention compared to POSTM1 and 2 (P < 0.01).
Moreover, HF, LF, and the LF/HF ratio differed significantly in PERIM women preintervention
compared to POSTM1 and 2 (P < 0.01, respectively). After 6 weeks, a significant decrease in
anthropometric variables was observed for all groups (P < 0.01). The VO2max in mL/kg/min
increased for all groups (P < 0.01). Multiple linear regression analysis demonstrated that age
contributed significantly to differences in VO2max values between groups preintervention (r =
0.72). This model accounted for 34% (r2 = 0.34) of the variation. On the other hand, menopause
status was an independent predictor of LO, accounting for 38% of the variation, as well as of HF
(33%), LF (29%), and the LF/HF ratio (24%). After HIIT, no age or menopause effect was detected
for these independent variables.
Maximal oxygen consumption, HF, LF, and the LF/HF ratio differ among women according to the
menopausal status and age. A 6-week HIIT intervention improved many health and performance
parameters and reduced the effects of menopause and age.
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