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Eur J Appl Physiol. 2018 May;118(5):1021-1031. doi: 10.1007/s00421-018-3834-y. Epub 2018 Mar 6.

The acute effect of Quercetin on muscle performance following a single resistance training session.

Author information

1
Laboratory of Exercise Physiology, Department of Movement, Human and Health Sciences, Università degli Studi di Roma "Foro Italico", Piazza Lauro De Bosis 6, Roma, 00135, Italy.
2
School of Public Health, Physiotherapy and Sports Science, Institute of Sport and Health, University College Dublin, Belfield, Dublin 4, Ireland.
3
Laboratory of Biochemistry of Movement, Department of Movement, Human and Health Sciences, Università degli Studi di Roma "Foro Italico", Piazza Lauro De Bosis 6, Roma, 00135, Italy.
4
Laboratory of Exercise Physiology, Department of Movement, Human and Health Sciences, Università degli Studi di Roma "Foro Italico", Piazza Lauro De Bosis 6, Roma, 00135, Italy. ilenia.bazzucchi@uniroma4.it.

Abstract

PURPOSE:

To examine the effect of acute quercetin (Q) ingestion on neuromuscular function, biomarkers of muscle damage, and rate of perceived exertion (RPE) in response to an acute bout of resistance training.

METHODS:

10 young men (22.1 ± 1.8 years, 24.1 ± 3.1 BMI) participated in a randomized, double-blind, crossover study. Subjects consumed Q (1 g/day) or placebo (PLA) 3 h prior to a resistance training session which consisted of 3 sets of 8 repetitions at 80% of the one repetition maximum (1RM) completed bilaterally for eight different resistance exercises. Electromyographic (EMG) signals were recorded from the knee extensor muscles during maximal isometric (MVIC) and isokinetic voluntary contractions, and during an isometric fatiguing test. Mechanical and EMG signals, biomarkers of cell damage, and RPE score were measured PRE, immediately POST, and 24 h (blood indices only) following the resistance exercise.

RESULTS:

After a single dose of Q, the torque-velocity curve of knee extensors was enhanced and after the resistance exercise, subjects showed a lower MVIC reduction (Q: 0.91 ± 6.10%, PLA: 8.66 ± 5.08%) with a greater rate of torque development (+ 10.6%, p < 0.005) and neuromuscular efficiency ratio (+ 28.2%, p < 0.005). Total volume of the resistance exercises was significantly greater in Q (1691.10 ± 376.71 kg rep) compared to PLA (1663.65 ± 378.85 kg rep) (p < 0.05) with a comparable RPE score. No significant differences were found in blood marker between treatments.

CONCLUSIONS:

The acute ingestion of Q may enhance the neuromuscular performance during and after a resistance training session.

KEYWORDS:

Electromyography; Flavonoids; Muscle damage; Strength

PMID:
29511920
DOI:
10.1007/s00421-018-3834-y
[Indexed for MEDLINE]

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