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1

Anaerobic threshold as a measure for assessing adaptation to physical exercise

100%
Krawczak J., Jaskolski A., Pilis W., Piaskowski J.
Acta Physiologica Polonica
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1979
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tom 30
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nr 1
2

Changes in the level of energy substrates determined by interval training and beta-adrenergic receptor blockade

88%
Piaskowski J., Jaskolski A., Pilis W., Jasiok A., Krawczak J.
Acta Physiologica Polonica
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1979
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tom 30
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nr 1
3

Effect of a 4-week mental training on decrease in grasping force in young healthy people

76%
Kisiel-Sajewicz K., Siemiatycka M., Mencel J., Kaminski L., Marusiak J., Jaskolski A., Jaskolska A.
Acta Neurobiologiae Experimentalis
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2019
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tom 79
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nr Suppl.1
INTRODUCTION: Not only muscle contraction, but also muscle relaxation plays an important role for performance of voluntary movements. Most of the studies have focused on muscle contraction rather than on their relaxation. Research on motor ability has established clearly that mental practice leads to improved execution of movement. AIM(S): Assessment of the effect of a four-week mental training on cortical activity related to decrease in grasping force in healthy, young people. METHOD(S): 15 healthy subjects (8 men and 7 women) between 23 to 33 years voluntarily participated in the study. Mental training (MT) lasted 4 weeks with 3 training sessions per week and cortical activity using 128‑channel EEG system was recorded in all subjects during two measurement sessions (before and after the MT). During sessions subjects performed: 3x maximal isometric voluntary contraction (MVIC) in grasp function, 40 repetitions at submaximal level of force (20% of MVIC) during the same task and 2 × MVIC. The amplitudes of motor related cortical potentials (MRCP) of the EEG signal were analyzed in the BESA software (BESA GmbH, Germany) for electrodes placed in the areas associated with the planning and execution of movements on averaged files from 20% MVIC part of the protocol and triggered around (from ‑3 s to 1 s) decrease in grasping force. To compare the MRCP values before and after MT, the Wilcoxon signed-rank test was performed in SPSS (IBM SPSS 22.0, USA) with the level of significant that was set at P≤0.05. RESULTS: Analysis of the MRCPs did show significant differences between relaxation amplitudes before and after the MT. CONCLUSIONS: Muscle relaxation is accompanied by activation of the premotor cortex (PM), primary motor (M1), primary and secondary somatosensory areas (S1, S2). The level of the cortical activity associated with relaxation of the muscles during precise grasp movement performed by right upper limb was higher after MT especially in the S1, S2 and PM areas compared to M1.
4

The magnitude of the movement-related cortical potentials during fast and slow voluntary knee extensor deactivation

76%
Kisiel-Sajewicz K., Siemionow V., Zhang L. D., Mencel J., Yue G. H., Jaskolska A., Jaskolski A.
Acta Neurobiologiae Experimentalis
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2012
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tom 72
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nr 2
The aim of the study was to learn cortical signal characteristics for controlling voluntary deactivation of human skeletal muscles with different speeds. This study investigated whether MRCP measures for fast knee extensor (KE) deactivation were different from those for slow deactivation. Twenty-seven healthy volunteers (22.4 ± 4.5 years) participated in the study. They performed isometric KE contractions [2 sets (slow and fast) of 45 trials] using the right leg at a target level of 20% maximal voluntary contraction (MVC) force. In each trial, subjects held the force at the target for 10s after reaching it and then relaxed the force slowly (rate of force descending ~4% MVC/s) or as quick as possible to the baseline during fast set. Cortical signals for deactivating the muscles were quantified by estimating amplitude of the MRCP derived by force-triggered averaging of the 45-trial EEG data. Mapping of the MRCP based on data of the 128 channels was obtained to evaluate distribution of brain activity associated with slow and fast KE deactivation. MRCP controlling KE deactivation was significantly higher for fast than slow deactivation (P<0.05). A higher level of cortical activation is required for controlling fast muscles deactivation. These findings indicated that control of KE deactivation at the cortical level is modulated by a rate of force decrease. This could be related to a varied impact of feedback and feedforward mechanisms during slow and fast deactivation and this may result in differential corticospinal projections to the motoneuron pools of the synergist and antagonist muscles during both conditions. This work was supported in part by NIH 1T32 AR050959 and R01 NS 35130 grants, and Ministry of Science and Higher Education, Republic of Poland 10/MOB/2007/0 grant
5

Effect of motor imagery training of reaching-to-grasp on cortical activity related to motor imagery and motor execution of grasping by dominant hand in healthy people

76%
Mancel J., Kaminski L., Marusiak J., Jaskolska A., Jaskolski A., Kisiel-Sajewicz K.
Acta Neurobiologiae Experimentalis
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2019
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tom 79
|
nr Suppl.1
INTRODUCTION: Motor imagery can be defined as a dynamic state during which a subject mentally simulates a given action. Conscious motor imagery and unconscious phase of motor planning potentially share common mechanisms. Voluntary movements, such as goal-directed reaching for an object, are those that are governed by motor programs and require planning. AIMS(S): The aim was to assess the effect of 4‑weeks of motor imagery training of reaching-to-grasp on cortical activity related to motor imagery of grasping (a book) and motor execution of grasping by dominant hand in healthy, young subjects. METHOD(S): 11 volunteers between 23 and 33 years participated in this study. There were: 2 measurement sessions (before motor imagery training (MIT) and after MIT) and 4‑weeks of kinesthetic MIT of reaching for a book (3 × a week) in the study’s protocol. During sessions 128‑EEG signal during motor imagery of grasping a book (MIG) and motor execution of grasping (MEG) by dominant hand was recorded. The analysis of EEG was made in BESA software and amplitudes of event related potential (ERP-related to motor imagery) and motor related cortical potential (MRCP-related to motor execution) from regions of motor programming and execution were obtained. The statistical analysis was made in SPSS software and for main comparison multivariate analysis of variance with repeated measures was used to assess effect between sessions, tasks and electrodes’ location with P≤0.05. RESULTS: The analysis has shown significant effect of electrodes’ location and tasks on EEG amplitude. There were no significant effect of session and interaction between factors. CONCLUSIONS: Mental training is important method to improve movements’ execution but its neural mechanisms are still unclear. Our study has shown that MIG and MEG share similar amplitude patterns in areas related to motor programming. We have observed a similar tendency to increase ERP and MRCP amplitudes as an effect of MIT.
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Moderate-intensity interval training increases serum brain-derived neurotrophic factor level and decreases inflammation in Parkinson's disease patients

76%
Zoladz J. A., Majerczak J., Zeligowska E., Mencel J., Jaskolski A., Marusiak J.
Journal of Physiology and Pharmacology
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2014
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tom 65
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nr 3
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