التفاصيل البيبلوغرافية
| العنوان: |
Effects of acute resistance exercise on myocardial perfusion and left ventricular energy waste: Comparisons between habitually resistance-trained only and combined exercise-trained populations. (English) |
| المؤلفون: |
Chang-Lun Shu, Shiou-Shu Huang, Lian-Yu Lin, Hsin-Fu Lin |
| المصدر: |
Physical Education Journal; 2023, Vol. 56 Issue 3, p285-298, 14p, 1 Chart |
| مصطلحات موضوعية: |
ISOMETRIC exercise, AEROBIC exercises, RESISTANCE training, CARDIAC contraction, PULSE wave analysis, EXERCISE therapy, REPEATED measures design |
| مستخلص: |
Introduction: We aimed to compare differences in pulse wave velocity (PWV) parameters between resistance-trained individuals and those without habitual aerobic training and to investigate whether the changes in myocardial perfusion and left ventricular energy waste in response to different intensities of acute resistance exercise differed between the groups. Methods: This study used a repeated measures design. Twenty-two habitually resistance-trained men were recruited and divided into a combined exercise-trained group (aerobic and resistance exercise training [RT+ET]; mean age = 23 ± 1 years; n = 11) and a resistance-trained only group (RT; mean age = 25 ± 1 years; n = 11) based on self-reported weekly aerobic exercise time (>150 minutes/week as recommended). Subjects were randomly assigned to perform a single bicep-curl at 40% or 80% 1RM (10 repetitions/set, 5 sets), respectively, after performing different PWV tests (ultrafast local carotid PWV and carotid-femoral and brachial-ankle PWV) and one-repetition maximum of bicep curls (1RM). The exercise sessions were performed at least 24 hours apart. Radial arterial waveforms were acquired before and after exercise using a vascular tonometer to obtain carotid blood pressure, subendocardial viability ratio (SEVR), and left ventricular energy waste. Systolic time intervals (STI) were also used to assess cardiac sympathetic activity. Results: The RT group had a higher PWV than the RT+ET group in all arterial stiffness measures, although these differences were not significant. A single bicep curl exercise at different intensities did not cause a significant increase in carotid arterial pressure in either group. Following exercise, RT showed an increase in carotid pulse pressure at 80% 1RM (p = .07), a significant decrease in SEVR (p = .02), and an increase in left ventricular energy waste (p = .08), which was significantly higher than that in the RT+ET group (p = .02). However, no significant changes in myocardial perfusion and left ventricular energy waste were observed in the RT+ET group after exercise. No significant changes of STI index were observed in either group. Conclusions: The attenuation of cardiac stress induced by an acute bout of high-intensity resistance exercise appears to be better in habitually combined exercise-trained young adults than in their resistance-trained only counterparts, indicating the importance of combining aerobic exercise with a regular training program in this population. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
