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State-Dependent Entrainment of Prefrontal Cortex Local Field Potential Activity Following Patterned Stimulation of the Cerebellar Vermis.

Author(s): Tremblay SA, Chapman CA, Courtemanche R

Front Syst Neurosci. 2019;13:60 Authors: Tremblay SA, Chapman CA, Courtemanche R

Article GUID: 31736718
Gap Junction Modulation of Low-Frequency Oscillations in the Cerebellar Granule Cell Layer.

Author(s): Robinson JC, Chapman CA, Courtemanche R

Cerebellum. 2017 08;16(4):802-811 Authors: Robinson JC, Chapman CA, Courtemanche R

Article GUID: 28421552
Basal Ganglia: Striosomes and the Link between Motivation and Action.

Author(s): Courtemanche R, Cammalleri A

Curr Biol. 2019 Jan 21;29(2):R62-R65 Authors: Courtemanche R, Cammalleri A

Article GUID: 30668951
Diurnal influences on electrophysiological oscillations and coupling in the dorsal striatum and cerebellar cortex of the anesthetized rat.

Author(s): Frederick A, Bourget-Murray J, Chapman CA, Amir S, Courtemanche R

Front Syst Neurosci. 2014;8:145 Authors: Frederick A, Bourget-Murray J, Chapman CA, Amir S, Courtemanche R

Article GUID: 25309348
Kinematics and muscle activation patterns during a maximal voluntary rate activity in healthy elderly and young adults.

Author(s): Chadnova E, St-Onge N, Courtemanche R, Kilgour RD

Aging Clin Exp Res. 2017 Oct;29(5):1001-1011 Authors: Chadnova E, St-Onge N, Courtemanche R, Kilgour RD

Article GUID: 27909885
Title:Kinematics and muscle activation patterns during a maximal voluntary rate activity in healthy elderly and young adults.
Authors:Chadnova E,  St-Onge N,  Courtemanche R,  Kilgour RD
Link:https://www.ncbi.nlm.nih.gov/pubmed/27909885?dopt=Abstract
DOI:10.1007/s40520-016-0688-1
Category:Aging Clin Exp Res
PMID:27909885
Dept Affiliation: PERFORM
1 Department of Exercise Science, Concordia University, 7141 Sherbrooke Street West, Montreal, QC, H4B 1R6, Canada.
2 McGill Vision Research Unit, Department of Ophthalmology, McGill University, Montreal, QC, H3A 1A1, Canada.
3 PERFORM Centre, Concordia University, Montreal, QC, Canada.
4 CRIR-Constance Lethbridge Rehabilitation Centre, Montreal, QC, Canada.
5 FRQS Groupe de Recherche en Neurobiologie Comportementale, Montreal, QC, Canada.
6 Department of Exercise Science, Concordia University, 7141 Sherbrooke Street West, Montreal, QC, H4B 1R6, Canada. robert.kilgour@concordia.ca.
7 PERFORM Centre, Concordia University, Montreal, QC, Canada. robert.kilgour@concordia.ca.
8 McGill Nutrition and Performance Laboratory (MNUPAL), McGill University Health Centre, Montreal, QC, Canada. robert.kilgour@concordia.ca.

Description:

Kinematics and muscle activation patterns during a maximal voluntary rate activity in healthy elderly and young adults.

Aging Clin Exp Res. 2017 Oct;29(5):1001-1011

Authors: Chadnova E, St-Onge N, Courtemanche R, Kilgour RD

Abstract

BACKGROUND: Maximal voluntary rate (MVR) performance tasks can provide important age-related information to the limiting factors associated with movement and the development of fatigue.

AIM: To determine whether kinematic and muscle activation patterns during an MVR task differ between young and older adults.

METHODS: We continuously measured frequency, amplitude, peak velocity, index of co-contraction and median frequencies of the index finger flexors and extensors during a 20-s MVR task in 10 young and 10 older subjects.

RESULTS: Index finger amplitude and peak velocity in flexion and extension were significantly lower in the older group. During the MVR, amplitude was maintained in the old (1-4 s, 53.2° ± 2.8° vs. 15-19 s, 48.6° ± 3.2°, ns) but not in the younger group (1-4 s, 64.9° ± 4.9° vs. 15-19 s, 59.4° ± 3.3°; p = 0.001). Frequency declined in the young (1-4 s, 5.2 ± 0.24 Hz vs. 15-19 s, 4.4 ± 0.25 Hz; p = 0.001) and old (1-4 s, 4.6 ± 0.17 Hz vs. 15-19 s, 4.0 ± 0.15 Hz; p = 0.01). Similarly, peak flexion velocity of the young (1-4 s, 1.77 ± 0.07 × 103 °/s vs. 15-19 s, 1.01 ± 0.07 × 103 °/s, p = 0.01) and older groups (1-4 s, 1.04 ± 0.07 × 103 °/s vs. 15-19 s, 0.78 ± 0.06 × 103 °/s; p = 0.016) as well as peak extension velocity of the young (1-4 s, 1.01 ± 0.053 × 103 °/s vs. 15-19 s, 0.78 ± 0.06 × 103 °/s, p = 0.01) and older groups (1-4 s, 0.72 ± 0.04 × 103 °/s vs. 15-19 s, 0.58 ± 0.05 × 103 °/s, p = 0.012) significantly decreased throughout the MVR. Median frequency of the flexors and extensors were maintained and were not different between groups. Only the older group experienced an increase in the index of co-contraction.

CONCLUSION: The changes in kinematics over time are not a result of a decrease in pre-post test force or velocity, but rather central factors affecting movement coordination.

PMID: 27909885 [PubMed - indexed for MEDLINE]