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• W2080477683 abstract "This study investigated the effects of acute psychosocial stress on trapezius single motor unit discharge behaviors. Twenty-one healthy women performed feedback-controlled isometric contractions under conditions of low and high psychosocial stress in the same experimental session. Psychosocial stress was manipulated using a verbal math task combined with social evaluative threat that significantly increased perceived anxiety, heart rate, and blood pressure (P < 0.001). Motor unit discharge behaviors including the threshold and discharge rate at recruitment [7.7% (5.7%) maximal voluntary isometric contraction and 7.3 pulses per second (pps) (6.8 pps), P > 0.121, N = 103] and derecruitment [6.0% (4.4%) maximal voluntary isometric contraction and 6.5 pps (4.1 pps), P > 0.223, N = 99], the mean [11.3 pps (2.3 pps), P = 0.309, N = 106] and variability [2.5 pps (0.91 pps), P = 0.958, N = 106] of discharge rate, and the proportion of motor units exhibiting double discharges (21%, P = 0.446) did not change across stress conditions. Discharge rate modulation with changes in contraction intensity was highly variable and similar across stress conditions (P > 0.308, N = 89). Rate-rate modulation of concurrently active motor units was also highly variable (r = −0.84 to 1.00, N = 75). Estimates of ΔF for motor unit pairs with rate-rate modulation ≥0.7 were positive and similar across stress conditions [4.7 pps (2.0 pps), P = 0.405, N = 16]. The results indicate that acute psychosocial stress does not alter trapezius motor unit discharge behaviors during a precisely controlled motor task in healthy women." @default.
• W2080477683 created "2016-06-24" @default.
• W2080477683 creator A5021258101 @default.
• W2080477683 creator A5065299743 @default.
• W2080477683 date "2010-02-01" @default.
• W2080477683 modified "2023-10-15" @default.
• W2080477683 title "Discharge Behaviors of Trapezius Motor Units During Exposure to Low and High Levels of Acute Psychosocial Stress" @default.
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• W2080477683 doi "https://doi.org/10.1097/wnp.0b013e3181cb81d3" @default.
• W2080477683 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2856657" @default.
• W2080477683 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20087201" @default.
• W2080477683 hasPublicationYear "2010" @default.
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