Acute acetaminophen ingestion improves performance and muscle activation during maximal intermittent knee extensor exercise

Morgan, Paul T, Bowtell, Joanna L, Vanhatalo, Anni, Jones, Andrew M and Bailey, Stephen J (2018) Acute acetaminophen ingestion improves performance and muscle activation during maximal intermittent knee extensor exercise. European Journal of Applied Physiology, 118 (3). pp. 595-605. ISSN 1439-6319

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Official URL: https://doi.org/10.1007/s00421-017-3794-7

Abstract

Aim: Acetaminophen is a commonly used medicine for pain relief and emerging evidence suggests that it may improve endurance exercise performance. This study investigated some of the physiological mechanisms by which acute acetaminophen ingestion might blunt muscle fatigue development. Methods: Thirteen active males completed 60 × 3 s maximum voluntary contractions (MVC) of the knee extensors with each contraction separated by a 2 s passive recovery period. This protocol was completed 60 min after ingesting 1 g of maltodextrin (placebo) or 1 g of acetaminophen on two separate visits. Peripheral nerve stimulation was administered every 6th contraction for assessment of neuromuscular fatigue development, with the critical torque (CT), which reflects the maximal sustainable rate of oxidative metabolism, taken as the mean torque over the last 12 contractions. Surface electromyography was recorded continuously as a measure of muscle activation. Results: Mean torque (61 ± 11 vs. 58 ± 14% pre-exercise MVC) and CT (44 ± 13 vs. 40 ± 15% pre-exercise MVC) were greater in the acetaminophen trial compared to placebo (both P < 0.05). Voluntary activation and potentiated twitch declined at a similar rate in both conditions (P > 0.05). However, the decline in electromyography amplitude was attenuated in the acetaminophen trial, with electromyography amplitude being greater compared to placebo from 210 s onwards (P < 0.05). Conclusion: These findings indicate that acute acetaminophen ingestion might be ergogenic by increasing CT and preserving muscle activation during high-intensity exercise.

Item Type:	Article (Article)
Peer-reviewed:	Yes
Date Deposited:	23 Nov 2023 12:19
Publisher:	Springer Verlag
Additional Information:	The version of record of this article, first published in European Journal of Applied Physiology, is available online at Publisher’s website: http://dx.doi.org/10.1007/s00421-017-3794-7
Divisions:	Faculties > Science and Engineering
Subject terms:	Science & Technology, Life Sciences & Biomedicine, Physiology, Sport Sciences, Analgesic, Critical torque, Electromyography, Neuromuscular fatigue, Single-leg exercise, CRITICAL POWER, ALL-OUT, PARACETAMOL ACETAMINOPHEN, METABOLIC-RESPONSES, PERIPHERAL FATIGUE, MECHANISTIC BASES, CRITICAL TORQUE, HUMANS, TIME, CONTRACTIONS, Knee, Muscle, Skeletal, Humans, Acetaminophen, Analgesics, Non-Narcotic, Exercise, Administration, Oral, Drug Administration Schedule, Muscle Fatigue, Muscle Contraction, Torque, Adult, Male, Analgesic, Critical torque, Electromyography, Neuromuscular fatigue, Single-leg exercise, Acetaminophen, Administration, Oral, Adult, Analgesics, Non-Narcotic, Drug Administration Schedule, Exercise, Humans, Knee, Male, Muscle Contraction, Muscle Fatigue, Muscle, Skeletal, Torque, 1106 Human Movement and Sports Sciences, Sport Sciences
URI:	https://e-space.mmu.ac.uk/id/eprint/633282
DOI:	https://doi.org/10.1007/s00421-017-3794-7
ISSN	1439-6319
e-ISSN	1439-6327

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