Acute Effects of Inspiratory Muscle Training at Different Intensities in Healthy People

The heart rate is the number of beats per minute of the heart. It represents both sympathetic and parasympathetic system activity. increased heart rate indicates that the sympathetic activity is dominant, while decreased heart rate indicates that parasympathetic activity is dominant.

Augmentation index is commonly used noninvasive measurements of wave reflection strength. To assess augmentation index, brachial artery compression waveforms were obtained by partially inflating a cuff over the brachial artery approximately midway between the shoulder and the elbow. The brachial waveforms were calibrated using cuff-measured brachial systolic and diastolic pressures, and then used to generate central aortic pressure waveforms by applying proprietary digital signal processing and transfer function. The central aortic pulse wave was used to determine augmentation index. High values represent abnormal wave reflection strength.

Aortic pulse wave velocity is commonly used noninvasive measurements of arterial stiffness. To assess aortic pulse wave velocity, carotid pulse waves were measured by applanation tonometry and femoral pulse waves were simultaneously obtained by a partially inflated cuff over the femoral artery at the leg midway between the hip and the knee. Aortic pulse wave velocity was determined by calculating the ratio of the corrected distance between the pulse measuring sites to the time delay between the carotid and femoral pulse waves. High values represent increased arterial stiffness.

Square Root of The Mean Squared Difference of Successive Normal to Normal R-R Intervals is one of the time domain methods of heart rate variability. It represents a primarily parasympathetic activity or vagal modulation. Low values indicate decreased parasympathetic activity. High values indicate increased parasympathetic activity.

Assessment of maximal inspiratory pressure with an electronic mouth pressure device (Micro; Micro Medical Ltd., Rochester, UK). Higher values indicate stronger inspiratory muscle strength.

Assessment of maximal expiratory pressure with an electronic mouth pressure device (Micro; Micro Medical Ltd., Rochester, UK). Higher values indicate stronger expiratory muscle strength.

Brachial and central systolic and diastolic blood pressure. High Brachial and central systolic and diastolic blood pressure are associated with higher risk of heart attacks and strokes, even in people with normal cuff Blood pressure.

Forced vital capacity is defined as the amount of air that can be forcibly exhaled from the lungs after taking the deepest breath possible.

The vital capacity is the volume of air a subject is able to expire after a maximal inspiration to the total lung capacity.

The volume of air expired in the first second of expiration or forced expiratory volume in 1 second, especially when expressed as a ratio with the total amount of air expired during the forced vital capacity, is a good index of expiratory airways resistance.

The International Physical Activity Questionnaire short-form measures physical activity. The International Physical Activity Questionnaire short-form occurs 7 items. The higher values indicate better physical activity level. The minimum score of scale was 0, and maximum score is depend on patients activity and there is no maximum score.

Fatigue level after the training will be questioned with a 100-mm visual analog scale, minimum 0 to maximum 100. Higher scores indicate higher fatigue levels.

Dyspnea level after the training will be questioned with the modified Borg Scale. Minimum value is 0 (no dyspnea), and maximum value is 10 (maximal dyspnea) Higher scores indicate higher fatigue levels.

Square Root of The Mean Squared Difference of Successive Normal to Normal R-R Intervals is one of the time domain methods of heart rate variability. It represents parasympathetic activity. Low values indicate decreased parasympathetic activity. High values indicate increased parasympathetic activity.

Low Frequency is one of the frequency domain methods of heart rate variability. Spectral power analysis is performed on a series of R-R intervals which separates the heart rate spectrum into various components and allows the quantification of sympathetic and vagal influences on the heart. Low Frequency range is 0.04-0.15 Hz. Low frequency band represents both sympathetic and parasympathetic modulation.

High Frequency is one of the frequency domain methods of heart rate variability. Spectral power analysis is performed on a series of R-R intervals which separates the heart rate spectrum into various components and allows the quantification of sympathetic and vagal influences on the heart. High Frequency range is 0.15-0.4 Hz. High Frequency band represents parasympathetic modulation. Low values indicate decreased parasympathetic activity. High values indicate increased parasympathetic activity.

Low Frequency/High Frequency ratio is one of the frequency domain methods of heart rate variability. Low Frequency/High Frequency ratio is a index of sympathovagal balance. Increased ratio indicates that the sympathetic activity is dominant, while decreased ratio indicates that parasympathetic activity is dominant.

Total Power is one of the frequency domain methods of heart rate variability. It shows general change of autonomic modulation. Low values indicate decreased autonomic modulation. High values indicate increased autonomic modulation.

Pulse transit time is the time that takes the pulse pressure wave to travel through the arterial tree. Decreased pulse transit time shows increased wave velocity on the vessels.

Standard Deviation of Normal to Normal R-R Intervals is one of the time domain methods of heart rate variability. Time Domain Analysis measures the change in heart rate over time or the intervals between successive normal cardiac cycles.It assesses globally heart rate variability. Low values indicate decreased heart rate variability. High values indicate increased heart rate variability.