Effect of order of exercise intensity upon cardiorespiratory, metabolic, and perceptual responses during exercise of mixed intensity

Jie Kang, Justin S. Schweitzer, Jay R. Hoffman

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

11 ציטוטים ‏(Scopus)

תקציר

Exercise of mixed intensities can be of benefit in many different ways. However, whether physiological interaction exists between exercises of different intensity is questionable. As such, the primary aim of this study was to examine the effect of order of exercise intensity upon cardiorespiratory, metabolic, and perceptual responses during exercise of mixed intensity. Eight males and four females volunteered to serve as subjects for the study. They were informed of the purpose of the experiment and gave their written consent to participate. Each subject completed a peak oxygen uptake (VO2peak) test and two submaximal exercises of mixed intensity on three separate laboratory visits. During each submaximal exercise trial, subjects performed a 15-min (high intensity) exercise at 70%VO2peak that was followed by another 15-min (low intensity) exercise at 50%VO2peak (high/low, H/L), or a 15-min exercise at 50%VO2peak that was followed by another 15-min exercise at 70%VO2peak (low/high, L/H). Oxygen uptake (̇VO2), respiratory exchange ratio (R), expired ventilation (VE), heart rate (HR) and ratings of perceived exertion (RPE) were measured every 5 min throughout exercise. Energy expenditure and carbohydrate and fat oxidation were calculated from VO2 adjusted for substrate metabolism using R and then accumulated for each phase of exercise intensity as well as for the entire exercise session. VO2 and HR were higher (P < 0.05, while R was lower (P < 0.05) at the lower intensity in H/L than in L/H. VE and RPE were lower (P < 0.05) at the higher intensity in H/L than in L/H. While no differences in caloric expenditure and carbohydrate oxidation between the two trials were observed, fat oxidation was higher (P < 0.05) both at the lower intensity and for the entire trial in H/L than in L/H. It appears that during exercise of mixed intensity, placing some periods of moderate intensity exercise prior to a milder one is a more favorable sequence in that it can elicit a greater fat oxidation while being felt less stressful.

שפה מקוריתאנגלית
עמודים (מ-עד)569-574
מספר עמודים6
כתב עתEuropean Journal of Applied Physiology
כרך90
מספר גיליון5-6
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - נוב׳ 2003
פורסם באופן חיצוניכן

טביעת אצבע

להלן מוצגים תחומי המחקר של הפרסום 'Effect of order of exercise intensity upon cardiorespiratory, metabolic, and perceptual responses during exercise of mixed intensity'. יחד הם יוצרים טביעת אצבע ייחודית.

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