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Mayo Clin Proc. 2015 Nov;90(11):1506-14. doi: 10.1016/j.mayocp.2015.07.024. Epub 2015 Oct 9.

Separate Effects of Intensity and Amount of Exercise on Interindividual Cardiorespiratory Fitness Response.

Author information

1
School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada; School of Medicine, Division of Endocrinology and Metabolism, Queen's University, Kingston, Ontario, Canada. Electronic address: rossr@queensu.ca.
2
School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada.

Abstract

OBJECTIVE:

To determine the separate effects of exercise intensity and amount on interindividual cardiorespiratory fitness (CRF) response.

PARTICIPANTS AND METHODS:

Participants were 121 (75 females, 62%) sedentary, middle-aged (mean [SD] age, 53.2 [7.5] years), abdominally obese adults who completed at least 90% of 5 weekly exercise sessions prescribed over a 24-week intervention. Participants were randomly assigned to (1) low-amount, low-intensity exercise (LALI) (180 and 300 kcal per session for women and men, respectively, at 50% of CRF [VO 2peak]; n=39), (2) high-amount, low-intensity exercise (HALI) (360 and 600 kcal per session for women and men, respectively, at 50% of CRF; n=51), or high-amount, high-intensity exercise (HAHI) (360 and 600 kcal per session for women and men, respectively, at 75% of CRF; n=31). Cardiorespiratory fitness was measured using a treadmill test at 4, 8, 16, and 24 weeks. The study duration was September 1, 2009, through May 31, 2013.

RESULTS:

Cardiorespiratory fitness increased within all 3 groups at 24 weeks (P<.001). At 24 weeks, 38.5% (15 of 39), 17.6% (9 of 51), and 0% (0 of 31) of the participants within the LALI, HALI, and HAHI groups, respectively, were CRF nonresponders. At a fixed exercise intensity, increasing exercise amount reduced the rate of nonresponse by 50% (P=.02). At a fixed amount of exercise, increasing the exercise intensity eliminated nonresponse (P=.001). Exposure to exercise decreased the number of CRF nonresponders between 4 and 8 weeks for LALI and by 16 weeks for HALI but plateaued thereafter. For HAHI, the number of CRF nonresponders decreased continually over the 24 weeks.

CONCLUSION:

For a fixed amount of exercise, increasing exercise intensity consistent with consensus recommendations eliminated CRF nonresponse. Low-intensity exercise may not be sufficient to improve CRF for a substantial proportion of sedentary obese adults.

PMID:
26455890
DOI:
10.1016/j.mayocp.2015.07.024
[Indexed for MEDLINE]

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