European journal of applied physiology
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Eur. J. Appl. Physiol. · Jun 2015
Age and sex differences in steadiness of elbow flexor muscles with imposed cognitive demand.
These studies determined (1) age- and sex-related differences in steadiness of isometric contractions when high cognitive demand was imposed across a range of forces with the elbow flexor muscles (study 1) and; (2) sex differences in steadiness among older adults when low cognitive demand was imposed (study 2). ⋯ Older adults had reduced steadiness and increased muscle activation when high cognitive demand was imposed while low cognitive demand induced increased force fluctuations in older women but not older men. These findings have implications for daily and work-related tasks that involve cognitive demand performed simultaneously during submaximal isometric contractions in an aging workforce.
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Eur. J. Appl. Physiol. · May 2015
Randomized Controlled TrialEffect of balance training on neuromuscular function at rest and during isometric maximum voluntary contraction.
This study was directed to investigate the neuromuscular function of the plantar flexors and tibialis anterior (TA) before and after 8 weeks of balance training. ⋯ Data suggest that balance training reduced antagonistic muscle co-activity at the onset of triceps surae contraction and, in turn, increased isometric explosive voluntary strength of the plantar flexors.
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Eur. J. Appl. Physiol. · Apr 2015
Randomized Controlled TrialImpact of acute sodium citrate ingestion on endurance running performance in a warm environment.
Dietary supplements inducing alkalosis have been shown to be ergogenic during intense endurance exercise in temperate environments, but there is lack of data regarding the efficacy of these substances in the heat. This study aimed to investigate the effect of sodium citrate (CIT) ingestion on 5,000-m running performance in a warm environment. ⋯ Acute CIT ingestion induces alkalosis, water retention, plasma volume expansion and an increase in post-exercise blood lactate concentration, but does not improve 5,000-m running performance in a warm environment in non-heat-acclimated endurance-trained males.
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Eur. J. Appl. Physiol. · Feb 2015
Randomized Controlled TrialDietary sodium citrate supplementation does not improve upper-body anaerobic performance in trained wrestlers in simulated competition-day conditions.
Similarly to a wrestling match, upper-body intermittent sprint performance (UBISP) test elicits severe acidosis. This study aimed to determine whether sodium citrate (CIT) ingestion would help to better maintain peak power (PP) and mean power (MP) output across four consecutive UBISP tests simulating wrestling matches of a competition-day. ⋯ In trained wrestlers, CIT ingestion induces alkalosis, counteracts reduction in plasma volume, increases post-test blood lactate concentration and reduces perceived exertion, but does not improve PP or MP attained in consecutive UBISP tests simulating four wrestling matches of a competition-day.
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Eur. J. Appl. Physiol. · Feb 2015
Comparative StudyEffects of increased skin blood flow on muscle oxygenation/deoxygenation: comparison of time-resolved and continuous-wave near-infrared spectroscopy signals.
We quantified the contribution of skin blood flow (SkBF) to tissue oxygenation/deoxygenation of the flexor digitorum profundus muscle during cutaneous vasodilation. ⋯ These findings support use of either NIRS method to estimate local muscle fractional O2 extraction, but not oxygenation, when SkBF is increased at rest.