Effect of Metabolic Stress to High-Load Exercise on Muscle Damage, Inflammatory and Hormonal Responses
To assess the impact of metabolic stress on blood lactate, muscle damage, inflammatory and hormonal responses following a high-load (70% maximum) strength training session, we compared two methods with a similar number of repetitions but that differed by their metabolic demand: the 3/7 method consis...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
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| Series: | Sports |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4663/13/4/111 |
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| Summary: | To assess the impact of metabolic stress on blood lactate, muscle damage, inflammatory and hormonal responses following a high-load (70% maximum) strength training session, we compared two methods with a similar number of repetitions but that differed by their metabolic demand: the 3/7 method consisting in two series of five sets of an increasing number of repetitions (3 to 7) with a short inter-set interval (15 s) and the 8 × 6 method that comprises eight sets of six repetitions with a longer inter-set interval (2.5 min). Blood concentrations in lactate, creatine kinase (CK), myoglobin (MB), interleukine-6 (IL-6), leukocytes, growth hormone (GH), insulin-like growth factor-1 (IGF-1) and cortisol were determined before and after each session. Lactate concentration increased more (11.9 vs. 3.1 mmol/L; <i>p</i> < 0.001) for the 3/7 method whereas CK and MB concentrations were augmented similarly (<i>p</i> > 0.05) for both methods. Inflammatory markers (leukocytes and IL-6) increased (<i>p</i> < 0.01) more after the 3/7 method. GH and cortisol concentrations also increased more (<i>p</i> < 0.001) after the 3/7 method with no difference in IGF-1 concentrations between methods. Positive associations were found between the change in lactate and changes in IL-6 (r<sup>2</sup> = 0.47; <i>p</i> < 0.01), GH (r<sup>2</sup> = 0.58; <i>p</i> < 0.001) and cortisol (r<sup>2</sup> = 0.61; <i>p</i> < 0.001) concentrations. In conclusion, the greater lactate accumulation induced by short inter-set intervals during a high-load training session is associated with enhanced inflammatory and hormonal responses, suggesting that metabolic stress might contribute to the greater adaptative response previously observed with this method. |
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| ISSN: | 2075-4663 |