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Titolo:
PSYCHOPHYSIOLOGICAL STRESS AND EMG ACTIVITY OF THE TRAPEZIUS MUSCLE
Autore:
LUNDBERG U; KADEFORS R; MELIN B; PALMERUD G; HASSMEN P; ENGSTROM M; DOHNS IE;
Indirizzi:
UNIV STOCKHOLM,DEPT PSYCHOL,DIV BIOL PSYCHOL S-10691 STOCKHOLM SWEDEN LINDHOLMEN DEV GOTHENBURG SWEDEN KOOPERATIONENS FORETAGSHALSOVARDSCENT STOCKHOLM SWEDEN
Titolo Testata:
International journal of behavioral medicine
fascicolo: 4, volume: 1, anno: 1994,
pagine: 354 - 370
SICI:
1070-5503(1994)1:4<354:PSAEAO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATECHOLAMINE EXCRETION; PSYCHOSOCIAL FACTORS; INDUSTRIAL-WORKERS; COLLAR WORKERS; ASSEMBLY LINE; A BEHAVIOR; SHOULDER; NECK; MYALGIA; TASKS;
Keywords:
MENTAL STRESS; PHYSICAL LOAD; PHYSIOLOGICAL STRESS; MUSCLE TENSION; WOMEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
U. Lundberg et al., "PSYCHOPHYSIOLOGICAL STRESS AND EMG ACTIVITY OF THE TRAPEZIUS MUSCLE", International journal of behavioral medicine, 1(4), 1994, pp. 354-370

Abstract

Although it is generally assumed that mental stress induces muscular tension, the experimental data have, so far, been inconclusive. Likelyexplanations for these inconsistent findings are (a) too small subject samples in some experiments, (b) the use of only one type of stress stimulation, and (c) the lack of objective (physiological) measurements documenting the stress-inducing properties of the experimental treatment. Furthermore, the effect of mental stress and physical load separately, versus the combined influence of physical and mental load on muscular tension, has not been investigated earlier. Therefore, the aim of the present experiment was to examine the effects of mental stress as well as of physical load, separately and in combination, on perceived stress, physiological stress responses, and on muscular tension as reflected in electromyographical (EMG) activity of the trapezius muscle. Sixty two female subjects were individually exposed to mental arithmetic, the Stroop color word test (CWT), the cold pressor test, standardized test contractions (TCs), and the CWT combined with a TC. Compared to baseline, the stress session induced significant increases in systolic and diastolic blood pressure, heart rate, urinary catecholamines, salivary cortisol, and self-reported stress. Each of the two mentalstress tests induced a significant increase in EMG activity. The CWT caused a rise in EMG activity also during the TC, which was significantly more pronounced than the increase induced by the CWT alone. Blood pressure responses and self-reported stress followed the same pattern as the EMG activity. The results are consistent with the assumption that psychological stress plays a role in musculoskeletal disorders by increasing muscular tension both in low-load work situations and in theabsence of physical load. It is also indicated that the stress-induced increase in muscular tension is accentuated on top of a physical load.

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Documento generato il 11/07/20 alle ore 07:20:29