Abstract
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 (V̇O2peak) 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%V̇O2peak that was followed by another 15-min (low intensity) exercise at 50%V̇O2peak (high/low, H/L), or a 15-min exercise at 50%V̇O2peak that was followed by another 15-min exercise at 70%V̇O2peak (low/high, L/H). Oxygen uptake (V̇O2), respiratory exchange ratio (R), expired ventilation (V̇ E), 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 V̇O2 adjusted for substrate metabolism using R and then accumulated for each phase of exercise intensity as well as for the entire exercise session. V̇O2 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. V̇ E 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.
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References
American College of Sports Medicine (1998) The recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness and flexibility in healthy adults. Med Sci Sports Exerc 30:975–991
Ballor DL, McCarthy JP, Wilterdink EJ (1990) Exercise intensity does not affect the composition of diet-and exercise-induced body mass loss. Am J Clin Nutr 51:142–146
Bassett DR, Merrill PW, Negle FJ, Agre JC, Sampedro R (1991) Rate of decline in blood lactate after cycling exercise in endurance-trained and -untrained subjects. J Appl Physiol 70:1816–1820
Borg GA (1982) Psychological bases of physical exertion. Med Sci Sports Exerc 14:377–381
Braun B, Zimmermann B, Kretchmer N (1995) Effects of exercise intensity on insulin sensitivity in women with non-insulin-dependent diabetes mellitus. J Appl Physiol 78:300–306
Egan D, Head T (1999) Energy substrate metabolism during dual work rate exercise: effect of order. J Sports Sci 17:889–894
Farrell PA, Gates WK, Maksud MG, Morgan WP (1982) Increases in plasma β-endorphin/β-lipotropin immunoreactivity after treadmill running in humans. J Appl Physiol 52:1245–1249
Francis PR, Witucki AS, Buono MJ (1999) Physiological response to a typical studio cycling session. ACSM's Health Fit J 3:30–36
Grant S, Armstrong G, Sutherland R, Wilsom J, Aitchison T, Paul E, Henderson S (1993) Physiological and psychological responses to a university fitness session. Br J Sports Med 27:162–166
Grediagin M, Cody M, Rupp J, Benardot D, Shern R (1995) Exercise intensity does not effect body composition change in untrained, moderately overfat women. J Am Diet Assoc 95:661–665
Hagberg JM, Mullin JP, Nagle FJ (1980) Effect of work intensity and duration on recovery O2. J Appl Physiol 48:540–544
Issekutz B, Shaw WA, Issekutz TB (1975) Effect of lactate on FFA and glycerol turnover in resting and exercising dogs. J Appl Physiol 39:349–353
Kang J, Robertson RJ, Goss FL, DaSilva SG, Suminski RR, Utter AC, Visich P (1996a) Effect of carbohydrate substrate availability on ratings of perceived exertion during prolonged moderate intensity exercise. Percept Mot Skills 82:495–506
Kang J, Robertson RJ, Hagberg JM, Kelley DE, Goss FL, DaSilva SG, Suminski RR, Utter AC (1996b) Effect of exercise intensity on glucose and insulin metabolism in obese individuals and obese NIDDM patients. Diabetes Care 19:241–349
Kang J, Robertson RJ, Goss FL, DaSilva SG, Suminski RR, Utter AC, Zoeller RF, Metz KF (1997) Metabolic efficiency of arm cranking and leg cycling at the same mode-specific relative exercise intensity. Med Sci Sports Exerc 29:377–382
Knuttgen HG (1970) Oxygen debt after submaximal physical exercise. J Appl Physiol 29:651–657
Mayer-Davis EJ, D'Agostino R Jr, Karter AJ, Haffner SM, Rewers MJ, Saad M, Bergman RN (1998) Intensity and amount of physical activity in relation to insulin sensitivity. JAMA 279:669–674
McArdle WD, Katch FI, Katch VL (1986) Measurement of human energy expenditure. In: McArdle WD, Katch FI, Katch VL (eds) Exercise physiology textbook, 2nd edn. Lea & Febiger, Philadelphia, pp 121–130
Mihevic PM (1981) Sensory cues for perceived exertion: a review. Med Sci Sports Exerc 12:150–163
Nichols JF, Sherman CL, Abbott E (2000) Treading is new and hot. ACSM's Health Fit J 4:12–17
Noble BJ, Robertson RJ (1996) Physiological and psychological mediators. In: Noble BJ, Robertson RJ (eds) Perceived exertion. Human Kinetics, Champaign, Ill., pp 215–255
Powers SK, Howley ET (2001) Exercise metabolism. In: Powers SK, Howley ET (eds) Exercise physiology textbook, 4th edn. McGraw Hill, New York, pp 47–65
Ravussin E, Bogardus C, Scheidegger K, LaGranger H, Horton ED, Horton ES (1986) Effect of elevated FFA on carbohydrate and lipid oxidation during prolonged exercise in humans. J Appl Physiol 54:893–900
Robertson RJ, Noble BJ (1997) Perception of physical exertion: methods, mediators, and application. Exerc Sport Sci Rev 25:407–452
Romijn JA, Coyle EF, Sidossis LS, Castaldelli A, Horowitz JF, Endert E, Wolfe RR (1993) Regulation of endogenous and carbohydrate metabolism in relation to exercise intensity and duration. Am J Physiol 265:E380–391
Sproule J (1998) Running economy deteriorates following 60 min of exercise at 80% VO2max. Eur J Appl Physiol 77:366–371
Young JC, Enslin J, Kuca B (1989) Exercise intensity and glucose tolerance in trained and nontrained subjects. J Appl Physiol 67:39–43
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Kang, J., Schweitzer, J.S. & Hoffman, J.R. Effect of order of exercise intensity upon cardiorespiratory, metabolic, and perceptual responses during exercise of mixed intensity. Eur J Appl Physiol 90, 569–574 (2003). https://doi.org/10.1007/s00421-003-0908-1
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DOI: https://doi.org/10.1007/s00421-003-0908-1