Comparison of the effects of aerobic and resistance training on cardiac autonomic adaptations in ovariectomized rats

Silveira, Larissa C.R.; Tezini, Geisa C.S.V.; Schujmann, Débora Stripari; Porto, Jaqueline Mello; Rossi, B; Souza, Hugo Celso Dutra de

doi:10.1016/j.autneu.2011.02.003

Cited by 19 publications

(14 citation statements)

References 47 publications

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“…With the two active groups having similar fitness, it is therefore unlikely that exercise training intensity per se can account for the augmented vagal modulation of HR in ExFHA women. Interestingly, the present finding is consistent with reports of augmented cardiac vagal modulation of HR in aerobically trained ovariectomized versus intact rats [41,42], suggesting that hypoestrogenemia may modulate exercise-training induced effects on parasympathetic HR modulation. Examination of such postulates awaits delineation.…”

Section: Exercise Training and Hr Modulationsupporting

confidence: 82%

Augmented vagal heart rate modulation in active hypoestrogenic pre-menopausal women with functional hypothalamic amenorrhoea

et al. 2015

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Section: Exercise Training and Hr Modulationsupporting

confidence: 82%

Augmented vagal heart rate modulation in active hypoestrogenic pre-menopausal women with functional hypothalamic amenorrhoea

et al. 2015

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“…The reduction in AP values seen in this study may be associated with a decrease in sympathetic tone, resulting in resting bradycardia after 8 weeks of moderate-intensity resistance exercise training. However, 10 weeks (3 times/week) of high-intensity resistance training on a ladder led to a reduction in resting HR and in intrinsic heart rate, but did not change either AP or cardiac autonomic tone in normotensive OVX rats (7). In male SHR rats, moderate-intensity treadmill exercise training reduced AP, HR, and sympathetic tone.…”

Section: Discussionmentioning

confidence: 90%

“…Studies have demonstrated resting bradycardia in young (3) and old (4) normotensive male rats, in young normotensive females rats (5), in female ovariectomized rats (6,7), in male and female hypertensive rats (8,9), and in humans (10). The mechanisms underlying the cardiac adaptive response to exercise training differ between species and genders (3,5,10).…”

Section: Introductionmentioning

confidence: 99%

“…However, the cardiovascular effects of this type of training remain poorly understood. Silveira et al reported bradycardia and a reduced intrinsic heart rate in Wistar normotensive OVX rats after high-intensity resistance exercise training (from 75% of body mass until maximal overload) on an adapted ladder (7). We recently standardized a moderate-intensity resistance exercise training protocol (at 40-60% of maximal load) on an adapted ladder to study the effects of this type of training in experimental models of disease.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic resistance training decreases sympathetic tone in hypertensive ovariectomized rats

Shimojo

Palma

Brito

et al. 2015

Braz J Med Biol Res

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The aim of this study was to investigate the effects of resistance exercise training on hemodynamics and cardiac autonomic control in ovariectomized spontaneously hypertensive rats. Female rats were divided into 4 groups: sedentary control (SC), sedentary hypertensive (SH), sedentary hypertensive ovariectomized (SHO), and resistance-trained hypertensive ovariectomized (RTHO). Resistance exercise training was performed on a vertical ladder (5 days/week, 8 weeks) at 40-60% maximal load. Direct arterial pressure was recorded. Vagal and sympathetic tones were measured by heart rate (HR) responses to methylatropine (3 mg/kg, iv) and propranolol (4 mg/kg, iv). Ovariectomy resulted in additional increases in blood pressure in hypertensive rats and was associated with decreased vagal tone. Resistance exercise trained rats had lower mean arterial pressure than untrained rats (RTHO: 159±2.2 vs SHO: 177±3.4 mmHg), as well as resting bradycardia (RTHO: 332±9.0 vs SHO: 356±5 bpm). Sympathetic tone was also lower in the trained group. Moreover, sympathetic tone was positively correlated with resting HR (r=0.7, P<0.05). The additional arterial pressure increase in hypertensive rats caused by ovarian hormone deprivation was attenuated by moderate-intensity dynamic resistance training. This benefit may be associated with resting bradycardia and reduced cardiac sympathetic tone after training, which suggests potential benefits of resistance exercise for the management of hypertension after ovarian hormone deprivation.

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“…In this respect, both the HF-PI band (representing parasympathetic modulation) and the LF-PI band (cardiac sympathetic modulation) were higher in trained groups compared with sedentary rats (DOS). Furthermore, a recent study with euglycemic ovariectomized rats that underwent resistance training at low or high intensity (8 wk, 3 days per week) has shown a reduction in the LF-PI band in both training intensities, but an increase in the HF-PI band only in the group trained at high intensity (32).…”

Section: Discussionmentioning

confidence: 99%

Impact of combined exercise training on cardiovascular autonomic control and mortality in diabetic ovariectomized rats

Sanches

Conti

Bernardes

et al. 2015

Journal of Applied Physiology

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The purpose of this study was to compare the effects of aerobic, resistance, or combined exercise training on cardiovascular autonomic control and mortality in diabetic ovariectomized rats. Female Wistar rats were divided into one of five groups: euglycemic sedentary (ES), diabetic ovariectomized sedentary (DOS), diabetic ovariectomized aerobic-trained (DOTA), diabetic ovariectomized resistance-trained (DOTR), or diabetic ovariectomized aerobic+resistance-trained (DOTC). Arterial pressure (AP) was directly recorded and baroreflex sensitivity was evaluated by heart rate responses to AP changes. Cardiovascular autonomic modulation was evaluated by spectral analyses. No differences were observed in body weight and glycemia between diabetic rats. Animals in the DOTC and DOTA groups exhibited an increase in running time, whereas animals in the DOTC and DOTR groups showed greater strength. Trained groups exhibited improvement in total power and the high-frequency band of pulse interval and reduced mortality (vs. DOS). Animals in the DOTC (bradycardic and tachycardic responses) and DOTA (tachycardic responses) groups exhibited attenuation in baroreflex dysfunction that was observed in DOS and DOTR animals, and an improvement in AP variance. In conclusion, all training protocols led to reduced mortality, which may be due to an increase in physical capacity and to cardiovascular and autonomic benefits following training, regardless of any improvement in glycemic control. In this model, the aerobic and combined trainings seem to promote additional cardiovascular autonomic benefits when compared with resistance training alone.

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Comparison of the effects of aerobic and resistance training on cardiac autonomic adaptations in ovariectomized rats

Cited by 19 publications

References 47 publications

Augmented vagal heart rate modulation in active hypoestrogenic pre-menopausal women with functional hypothalamic amenorrhoea

Augmented vagal heart rate modulation in active hypoestrogenic pre-menopausal women with functional hypothalamic amenorrhoea

Dynamic resistance training decreases sympathetic tone in hypertensive ovariectomized rats

Impact of combined exercise training on cardiovascular autonomic control and mortality in diabetic ovariectomized rats

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