جستجوی مقالات مرتبط با کلیدواژه « heart rate variability » در نشریات گروه « تربیت بدنی »

Some evidence suggests that vigorous physical activity with a mask may potentially increase cardiac workload.The aim of the current research is to investigate the effect of 2 weeks of moderate-intensity training group with a face mask on the physiological responses of the cardiac autonomic system.In this practical and semi-experimental research, eighteen female volunteers were randomly were divided to two groups of MIIT with N95 masks and surgery masks.A control group of MIIT without mask was assigned. The MIIT with N95 mask and the MIIT group with surgical mask performed the weight-based interval training protocol while wearing N95 or surgical masks for two weeks.The MIIT group without mask also performed the same exercises without wearing a mask. CAS indices were evaluated using an electrocardiogram device and kubios software at rest and following the submaximal protocol before and after the 2-week MIIT intervention, and statistical analyzes were performed using SPSS software 25 version at the level Significance was done. Based on the Kolmogorov Smirnov test, parametric statistical methods including one-way ANOVA in repeated measurements were used to investigate the effect of submaximal running on a treadmill with two types of masks before and after two weeks of MIIT training. According to the two-way analysis of variance test, there was a non-significant decrease in R-R, RMSSD, SDNN, SD1 and SD2 values and a non-significant increase in the ratio of low frequency ,and the ratio of low frequency/high frequency in the subsequent N95, SURGICAL and NO-MASK groups. According to two-way analysis of variance test, insignificant decrease in R-R, RMSSD, SDNN, SD1 and SD2 values and insignificant increase in low frequency ratio ,and low frequency/high frequency ratio , in groups N95, SURGICAL and NO-MASK was observed following the submaximal protocol.Compared to the MIIT + Nomask group, two weeks of MIIT with mask improved the R-R, SD1 and SD2 values in response to the submaximal protocol, especially in the MIIT + SUR group There was no difference between N95 and SURGICAL groups.The findings of the present study showed that the tolerance of the cardiac autonomic system of healthy women to the sports stress protocol following two weeks of moderate intensity training with a mask, with more significant results in the group of moderate intensity training with a surgical mask.According to the results, healthy women can use a face mask during moderate-intensity exercise during the Covid-19 pandemic without worrying about possible harmful effects on the cardiovascular system.

Overweight and obesity in children are the underlying cause of cardiovascular problems that occur through Autonomic Nervous System (ANS) dysfunction, However, physical training has a beneficial effect on the ANS. These changes can be measured through Heart Rate Variability (HRV) indices. Accordingly, the present study aimed to investigate the effect of five weeks of High-Intensity Interval Training (HIIT) on HRV and Rate Pressure Product (RPP) of overweight girls.

In this research, overweight students in the range of +2 < BMI Z- SCORE <1+ participated in the Experimental and the Control groups. Before and after five weeks of HIIT intervention, the participants underwent the Shuttle Run test to estimate maximal oxygen consumption and the Six-Minute Walking test to estimate maximal fat oxidation (MFO) during exercise. Root Mean Square of Successive Difference (RMSSD) of the R-R wave interval of the heartbeat was recorded to measure resting HRV and also systolic blood pressure and heart rate were recorded to measure resting RPP in the first and the last week. Data analysis was done using dependent t-tests and analysis of covariance (ANCOVA) with a significance level of p<0.05.

the results showed that in the training group, five weeks of HIIT intervention caused significant changes in RMSSD, RPP, and MFO of overweight girls (P<0.05). However, in the control group, the indices did not change significantly (P>0.05).

RMSSD, RPP, and MFO indices can be used as suitable and efficient alternatives to identify children at risk and therapeutic processes before puberty.

During the COVID-19 pandemic, people are concerned about wearing a mask during physical activity and its effect on the cardiac autonomic system (ANS). The purpose of the study was the effect of 2-weeks of moderate-intensity interval training (MIIT) based body weight combined with wearing face masks (surgery against N95) on the ANS response of healthy men following the submaximal treadmill running protocol (STRP) and 5 minutes of recovery during the SARS-CoV-2 pandemic. This study,18 healthy men were randomly divided into 3 groups of 6 (surgical mask,N95 mask and Nomask) and MIIT exercises with and without surgical masks or N95 3-times a week, each session with 3-repetitions with intensity (60-70% Maximum-heart rate). Parasympathetic (RMSSD, HFn.u) and sympathetic parameters (LFn.u, LF/HF) and Change distance R-R were evaluated with electrocardiogram and Kubius software before and to 5 minutes of recovery. One-way ANOVA and Bonferroni post hoc test were used. The results showed, STRP protocol Implementation before 2-weeks of MIIT did not make a significant difference in LF, LF/HF, RMSSD, HF and mean RR values between the experimental groups (surgical mask against N95 mask) and also compared with the control group (without mask(. In addition, although the intergroup changes in sympathetic and parasympathetic indices and mean RR after 2-weeks of MIIT show relative improvement, they have not yet been statistically significant. Wearing facemasks during exercise training is safe for healthy men and 2 weeks of adaptation to interval training with face mask improves ANS performance.

Without considering the circadian rhythm of heart rate, previous studies found controversial and incomparable responses of heart rate variability to aerobic exercises. The present study intended to investigate the effect of different aerobic exercise courses with the same volume, which were performed daily or twice-daily at different times of the day, on the autonomic cardiac nervous systems of young, non-athlete men.

48 young, non-athlete men were randomly divided into 4 groups, each group included 12 participants. The first group performed a 60-minute session of aerobic exercise in the morning, while the second one had the same course in the afternoon. Also, the third group had two sessions of aerobic exercise with a 30-minute duration in the morning and afternoon. The fourth one was the control group, having no intervention. The exercise courses were performed daily for 3 consecutive weeks, with the intensity of 60% of the maximum heart rate. The heart rate variability parameters, including the SDNN, rMSSD, LF, HF, LF/HF, SD1, SD2, and SD2/SD1, were assessed using a Holter monitor. The multivariate analysis of variance and the Bonferroni post hoc test were used for data analysis.

Aerobic exercises had significant effects on all the heart rate variability parameters (p = 0.01). The daily morning course could increase the SDNN, rMSSD, SD1, and SD2 while decreasing the LF. The daily afternoon course led to an increased HF and decreased LF/HF. Also, the twice-daily course led to a more prominent decreasing effect on the SD2/SD1 compared to the other exercise groups (p = 0.01).

It was highly probable that the daily morning exercise course had better effects on the cardiac autonomic system function.
.

Maintaining cardiac rhythm and contraction – during and flowing exercise training in particular- are challenges that exercise science scientists has always been facing. Therefore, the present study was conducted to examine the relationship between cardiac autonomic function after upper body exercise and total body water in men of different ages.

Twenty-four active men voluntarily participated after describing the goals and stages of the study, and then divided into two groups of 12 (middle-aged and elderly). Kubios heart rate variability software was used in order to measure heart rate variability. Heart rate variability was measured at rest, during and following five and10 minutes after upper body exercise. Body composition analyzer was used to determine the total body water of the participants. To examine the changes and the relationship between the variables of the research, statistical analysis of ANOVA with repeated measures and Pearson correlation were used, respectively.

The results showed that in both middle-aged and elderly groups, heart rate variability decreased during and immediately after exercise compared to rest (P < 0.05), but it increased in five and 10 minutes of recovery as compared to immediately after exercise (P < 0.05). Further, significant relationships were found between heart rate variability and total body water in both middle-aged and elderly groups (P < 0.05).

Overall, our findings showed that the heart rate variability in both middle-aged and elderly groups during and after upper body exercise is related to total body water. Therefore, it can be concluded that changes in cardiac autonomic system depend on the type of activity, the age of the participants, and the amount of total water body.

Cardiac autonomic system dysfunction in type 2 diabetic patients can lead to diabetic neuropathy. The purpose of this study was to investigate the meta-analysis of the effect of aerobic exercise on cardiac autonomic system in middle-aged men with type 2 diabetes.

A total of 256 related articles were selected by searching in the Pubmed, Web of Science, ScienceDirect and Magiran databases. Finally, considering the inclusion criteria, 11 articles were selected for evaluation and analysis after validation using PEDro scale. PICOS method was used to extract data from each article. Then, they were analyzed using Comprehensive Meta Analysis V3.exe software with group comparisons method and random and fixed effects size models of each study.

Regular participation in aerobic training programs in middle-aged men with type 2 diabetes had significant effects on SDNN as time domain index (p = 0.004; effect size = 0.33) and HF as frequency domain index (P = 0.017; effect size = 0.23). Also, these exercises had an insignificant effect on the rMSSD as time domain index (p = 0.096; effect size = 0.50) and LF as frequency domain index (p = 0.184; effect size = 0.47).

Regular participation in moderate intensity aerobic exercise in middle-aged men with type 2 diabetes can partially prevent the effects of this disease on cardiac autonomic system function. Therefore, it is recommended for middle-aged diabetic patients to consider exercise as one of their therapeutic modalities.

The aim of present study was to examine the difference between the cardiovascular performance of women and men due to running effects using phase space dynamics.

Fifty four University students were voluntarily participated in this study and divided in two groups’ male (34 participants, 21.68±1.66 years old and 67.01±9.77 Kg) and female (20 participants, 22.4±5.33 years old and 54.1±5.79 Kg). Heart rate variability (HRV) parameters as a function of the cardiovascular system indices measured in these subjects. Using drawing the phase space dynamics and applying the Poincaré section, the features of the time-domain extracted. Data were analyzed by an independent t-test with a significance level (p<0.05).

The results of this study showed that the HRV parameters, i.e., P-Com, PNN50, HRmax, Tr, and  in men’s group significantly altered compared to the women’s group. We found that the average time for reach to maximum heart rate was higher in the women's group and that the average PNN50 and rMSSD parameters in the men's, were higher than the women's, which was stimulated by the parasympathetic and vagus nerve and affected. So this point demonstrated the slowest rhythm of the heartbeat in men.

According to the experimental results, during exercise activities, there is a phenomenon of hysteresis in the cardiac phase space arising from the chaotic and nonlinear dynamics of the biological system in the human body. Therefore, the analysis of these parameters indicates that the intervals between two consecutive beats are higher in men. Thus, they have fewer beats rhythm. Besides, this group is almost more physically fit than women are.

The purpose of this study was to investigate the effect of a continuous period of aerobic exercise on heart rate variability by using nonlinear methods in young academic male university.

A total of 28 young academic male were randomly divided into study groups (control group; aerobic training group). In the pre-test and post-intervention period, all parameters of heart rate variability were measured by time method and heart rate sequencing. The standard deviation of the recorded sequences was then interpreted using the Poincare plot method. In order to compare the differences in the research stages, independent and depended T-tests were used.

The SD1 in comparison with the control group (p = 0.01) and the pretest (p = 0.01) and the SD2 was significantly higher than control group (p = 0.01) and pre-test (p = 0.02). After transfer to normal SD1n, compare to the control group (p = 0.02) showed a significant increase and did not increase the pre-test comparison (p = 0.08), SD2n compared to the control group (0.04) p), there was a significant increase and had a non-significant increase compared to the pre-test (p = 0.02). Comparison of SD1 / SD2 compared to the control and pre-test group did not show any significant difference (p≤0.05).

Regular and continuous implementation of moderate intensity aerobic exercise improves cardiac neural responsiveness in young academic male .

The aim of the present study was to compare between effects of 8 weeks of high-intensity interval training (HIT) based on heart rate (HR-based) or Speed (Speed-based) on aerobic power and heart rate variability (HRV) in young active girls.

25 girls physical education students from Shokrani school of Isfahan voluntary participated in this study. The subjects were divided into Speed-based (Number: 13; Age: 17.3 ± 0.6 yrs, Weight: 60.1 ± 7.7 kg, Height: 166.1 ± 6.0 cm) or HR-based (Number: 12; Age: 17.1 ± 0.2 yrs, Weight: 59.9 ± 3.8 kg, Height: 165.2 ± 2.6 cm) groups. Subjects underwent the 30-15 Intermittent Fitness Test (30-15IFT) before and after 8 weeks of HIT, to measure the maximal performance (VIFT) and estimate maximal oxygen uptake (VO2max) as aerobic power indices. Resting HRV was also recorded in the first and last weeks. Dependent t-test and analyses of covariate (ANCOVA) with the significant level of P

8 weeks of HIT with both methods elicited significant increases in VO2max and VIFT (P

It seems, that both HIT intensity controlling methods are effective in improving aerobic power but eliciting changes in HRV needs implementing HR-based approach.

The objective of this research paper is to evaluate the response of autonomic nervous system to different auditory stimuli rhythm in rest, exercise and recovery conditions. For this purpose, 14 physical education students with an average age of 21.5 0.79 years, weight 64.9 88.42 kg, body mass index 20.2 72.25 kg/m2 and height 176.3 83.99 cm were selected and during four separate sessions (without music, metronome, audio stimuli regular, irregular sound stimuli) evaluated. In each occasion, during three phases of rest, exercise and recovery, a twelve-lead electrocardiogram was recorded. Heart rate variability was measured with a total recording time of 10 min at rest, 10 min at exercise and 15 min at recovery phases. Analysis by repeated measurements ANOVA showed that during rest phase, no significant effects of auditory stimulus on Heart rate variability periods were observed. in contrast to the resting phase, during exercise phase auditory stimuli significantly reduced Heart rate variability. Especially, the effects of syncopated and unsyncopated auditory stimuli were more prominent. Similar to rest phase, during recovery phase, Heart rate variability indices were not significantly changed. The findings of this study showed that entrainment with auditory stimuli had effect on Heart rate variability. Also, the Heart rate variability response was influenced by the auditory stimuli structure. In sum, entrainment with auditory stimuli decreased Heart rate variability.