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Erschienen in:
11.10.2023 | Original Article
Intense interval exercise induces greater changes in post-exercise metabolism compared to submaximal exercise in middle-aged adults
Erschienen in: European Journal of Applied Physiology | Ausgabe 4/2024
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Introduction
High-intensity interval training (HIIT) and sprint interval training (SIT) consistently elevate post-exercise metabolism compared to moderate-intensity continuous training (MICT) in young adults (18–25 years), however few studies have investigated this in middle-aged adults.
Purpose
To assess the effect of exercise intensity on post-exercise metabolism following submaximal, near-maximal, and supramaximal exercise protocols in middle-aged adults.
Methods
12 participants (8 females; age: 44 ± 10 years; \({\dot{\text{V}}}\)O2max: 35.73 ± 9.97 mL·kg−1 min−1) had their oxygen consumption (\({\dot{\text{V}}}\)O2) measured during and for 2 h following 4 experimental sessions: (1) no-exercise control (CTRL); (2) MICT exercise (30 min at 65% \({\dot{\text{V}}}\)O2max); (3) HIIT exercise (10 × 1 min at 90% maximum heart rate with 1 min rest); and (4) modified-SIT exercise (8 × 15 s “all-out” efforts with 2 min rest). Between session differences for \({\dot{\text{V}}}\)O2 and fat oxidation were compared.
Results
O2 consumed post-exercise was elevated during the 1st h and 2nd h following HIIT (15.9 ± 2.6, 14.7 ± 2.3 L; P < 0.036, d > 0.98) and modified-SIT exercise (16.9 ± 3.3, 15.30 ± 3.4 L; P < 0.041, d > 0.96) compared to CTRL (13.3 ± 1.9, 12.0 ± 2.5 L) while modified-SIT was also elevated vs HIIT in the 1st h (P < 0.041, d > 0.96). Total post-exercise O2 consumption was elevated following all exercise sessions (MICT: 27.7 ± 4.1, HIIT: 30.6 ± 4.8, SIT: 32.2 ± 6.6 L; P < 0.027, d > 1.03) compared to CTRL (24.9 ± 4.1 L). Modified-SIT exercise increased fat oxidation (0.103 ± 0.019 g min−1) compared to all sessions post-exercise (CTRL: 0.059 ± 0.025, MICT: 0.075 ± 0.022, HIIT: 0.081 ± 0.021 g·min−1; P < 0.007, d > 1.30) and HIIT exercise increased compared to CTRL (P = 0.046, d = 0.87).
Conclusion
Exercise intensity has an important effect on post-exercise metabolism in middle-aged adults.