The Effects of High‐Intensity Treadmill‐Running on Gastric Emptying and Heart Rate Variability in a Rodent Model

Physically inactive adults are prevalent worldwide. This study compared the effects of short-term high-intensity interval training (HIIT) versus moderate-intensity continuous training (MICT) on heart rate variability (HRV) in physically inactive adults as a preliminary study. Thirteen physically inactive male adults (27.5 ± 3.80 years) were randomly assigned to HIIT (N = 7) or MICT (N = 6). The HIIT program consisted of 20 min of interval training with cycling to rest ratio of 10/50 s at ≥90% HRpeak, while the MICT program consisted of 40 min of continuous cycling at 60–75% HRpeak. Both groups completed eight sessions of training within two weeks. Time and frequency domains of HRV were measured for 20 min with Actiwave-Cardio monitor (CamNtech, UK). The number of R-R interval and inter-beat interval (IBI) were significantly improved (p < 0.05) in both HIIT and MICT programs following eight sessions of training. A significant interaction effect for group by time was found in the lnLF/HF ratio (p < 0.05) where it was only improved in the HIIT group from pre- to post-test. The HIIT program is superior to MICT in improving HRV in physically inactive adults. The HIIT program can be applied as a time-efficient program for improving cardiac-autoregulation.

Download Full-text

Comparison of different volumes of high intensity interval training on cardiac autonomic function in sedentary young women

International Journal of Adolescent Medicine and Health ◽

10.1515/ijamh-2017-0073 ◽

2017 ◽

Vol 31 (6) ◽

Cited By ~ 6

Author(s):

Pooja Bhati ◽

Vishal Bansal ◽

Jamal Ali Moiz

Keyword(s):

Heart Rate ◽

Body Composition ◽

Muscle Strength ◽

Young Women ◽

High Intensity ◽

High Frequency ◽

Interval Training ◽

Treadmill Running ◽

High Intensity Interval Training ◽

High Intensity Interval

Abstract Purpose The present study was conducted to compare the effects of low volume of high intensity interval training (LVHIIT) and high volume of high intensity interval training (HVHIIT) on heart rate variability (HRV) as a primary outcome measure, and on maximum oxygen consumption (VO2max), body composition, and lower limb muscle strength as secondary outcome measures, in sedentary young women. Methods Thirty-six participants were recruited in this study. The LVHIIT group (n = 17) performed one 4-min bout of treadmill running at 85%–95% maximum heart rate (HRmax), followed by 3 min of recovery by running at 70% HRmax, three times per week for 6 weeks. The HVHIIT group (n = 15) performed four times 4-min bouts of treadmill running at 85%–95% HRmax, interspersed with 3-min of recovery by running at 70% HRmax, 3 times per week for 6 weeks. All criterion measures were measured before and after training in both the groups. Results Due to attrition of four cases, data of 32 participants was used for analysis. A significant increase in high frequency (HF) power (p < 0.001) and decrease in the ratio of low frequency to high frequency power (LF/HF) ratio (p < 0.001) in HRV parameters, was observed post-HVHIIT, whereas, these variables did not change significantly (HF: p = 0.92, LF/HF ratio: p = 0.52) in LVHIIT group. Nevertheless, both the interventions proved equally effective in improving aerobic capacity (VO2max), body composition, and muscle strength. Conclusion The study results suggest that both LVHIIT and HVHIIT are equally effective in improving VO2max, body composition, and muscle strength, in sedentary young women. However, HVHIIT induces parasympathetic dominance as well, as measured by HRV.

Download Full-text

A pilot study of the effects of a high‐intensity aerobic exercise session on heart rate variability and arterial compliance in adolescents with or without type 1 diabetes

Pediatric Diabetes ◽

10.1111/pedi.12983 ◽

2020 ◽

Vol 21 (3) ◽

pp. 486-495

Author(s):

Shai Konnar D. Ansell ◽

Megan Jester ◽

Jeanie B. Tryggestad ◽

Kevin R. Short

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Type 1 Diabetes ◽

Pilot Study ◽

Aerobic Exercise ◽

High Intensity ◽

Arterial Compliance ◽

Exercise Session

Download Full-text

The Effects Of High Intensity Interval Training On Heart Rate Variability In Physically Inactive Adults

Medicine & Science in Sports & Exercise ◽

10.1249/01.mss.0000535704.62987.89 ◽

2018 ◽

Vol 50 (5S) ◽

pp. 188

Author(s):

Abdullah B. Alansare ◽

Elward K. Alford ◽

Sukho Lee ◽

Tommie Church ◽

Hyun Chul Jung

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

High Intensity ◽

Interval Training ◽

High Intensity Interval Training ◽

High Intensity Interval ◽

Physically Inactive

Download Full-text

Frequency and Intensity of Electrical Stimulation of Human Sympathetic Ganglia Affect Heart Rate Variability and Pain Threshold

Applied Sciences ◽

10.3390/app9214490 ◽

2019 ◽

Vol 9 (21) ◽

pp. 4490 ◽

Cited By ~ 1

Author(s):

Cho

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Electrical Stimulation ◽

High Intensity ◽

High Frequency ◽

Pain Control ◽

Pain Threshold ◽

Control Period ◽

Sympathetic Ganglia ◽

Thoracic Vertebrae

The study relates to the selection of effective clinical treatments based on the changes associated with each electrical stimulation condition. The aim was to investigate the effects of electrical stimulation on the autonomic nervous system by evaluating the heart rate variability (HRV) and pain threshold in response to different interferential current conditions applied to the sympathetic ganglia. Forty five participants were randomly assigned to receive high frequency-low intensity (HF-LI), low frequency-high intensity (LF-HI), or high frequency-high intensity (HF-HI) electrical stimulation. We then used bipolar adhesive pad electrodes to stimulate the thoracic vertebrae T1–T4 for 20 min, and changes were evaluated before, immediately after and 30 min after electrical stimulation. Results revealed significant HRV immediately after HF-LI and LF-HI electrical stimulations. This present study finding of a reduction in HRV immediately after HF-HI electrical stimulation confirms HRV measurement reliability based on electrical stimulation parameters. Results revealed a significant increase in the pain threshold with HF-HI electrical stimulation than for the other conditions; there was also a shorter pain duration. The present study also showed a significant effect of the HF-LI and LF-HI conditions on the pain threshold immediately after electrical stimulation, but the results after 30 min only revealed significant changes in the LF-HI group, indicating a maintenance of the pain control period immediately and 30 min after electrical stimulation. Different conditions of electrical stimulation resulted in distinct changes in HRV and pain control duration.

Download Full-text

Controlled 5-mo aerobic training improves heart rate but not heart rate variability or baroreflex sensitivity

Journal of Applied Physiology ◽

10.1152/jappl.2000.89.5.1825 ◽

2000 ◽

Vol 89 (5) ◽

pp. 1825-1829 ◽

Cited By ~ 98

Author(s):

Antti Loimaala ◽

Heikki Huikuri ◽

Pekka Oja ◽

Matti Pasanen ◽

Ilkka Vuori

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Exercise Training ◽

High Intensity ◽

Baroreflex Sensitivity ◽

Aerobic Training ◽

Control Group ◽

Resting Heart Rate ◽

Endurance Time ◽

Low Intensity

Endurance-trained athletes have increased heart rate variability (HRV), but it is not known whether exercise training improves the HRV and baroreflex sensitivity (BRS) in sedentary persons. We compared the effects of low- and high-intensity endurance training on resting heart rate, HRV, and BRS. The maximal oxygen uptake and endurance time increased significantly in the high-intensity group compared with the control group. Heart rate did not change significantly in the low-intensity group but decreased significantly in the high-intensity group (−6 beats/min, 95% confidence interval; −10 to −1 beats/min, exercise vs. control). No significant changes occurred in either the time or frequency domain measures of HRV or BRS in either of the exercise groups. Exercise training was not able to modify the cardiac vagal outflow in sedentary, middle-aged persons.

Download Full-text