Many occupations and sports require high levels of manual dexterity under thermal stress and mental fatigue. Yet, multistressor studies remain scarce. We quantified the interactive effects of thermal stress and mental fatigue on manual dexterity. Seven males (21.1 ± 1.3 yr) underwent six separate 60-min trials characterized by a combination of three air temperatures (hot, 37C; neutral, 21C; cold, 7C) and two mental fatigue states (MF, mental fatigue induced by a 35-min cognitive battery; no-MF, no mental fatigue). Participants performed complex (O'Connor test) and simple (hand-tool test) manual tasks pre- and posttrial to determine stressor-induced performance changes. We monitored participants' rectal temperature and hand skin temperature (Thand) continuously and assessed the reaction time (handclick test) and subjective mental fatigue (5-point scale). Thermal stress (P < 0.0001), but not mental fatigue (P = 0.290), modulated Thand (heat, +3.3C [95% CI: +0.2, +6.5]; cold, 7.5C [10.7, 4.4]). Mental fatigue (P = 0.021), but not thermal stress (P = 0.646), slowed the reaction time (10%) and increased subjective fatigue. Thermal stress and mental fatigue had an interactive effect on the complex manual task (P = 0.040), with cold-no-MF decreasing the performance by 22% [39, 5], whereas neutral-MF, cold-MF, and heat-MF by 36% [53, 19], 34% [52, 17], and 36% [53, 19], respectively. Only mental fatigue decreased the performance in the simple manual task (30% [43, 16] across all thermal conditions; P = 0.002). Cold stress-induced impairments in complex manipulation increase with mental fatigue; yet combined stressors' effects are no greater than those of mental fatigue alone, which also impairs simple manipulation. Mental fatigue poses a greater challenge to manual dexterity than thermal stress.

Valenza A., Charlier H., Bianco A., & Filingeri D. (2020). Independent and interactive effects of thermal stress and mental fatigue on manual dexterity. AMERICAN JOURNAL OF PHYSIOLOGY. REGULATORY, INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 319(6), R703-R711 [10.1152/AJPREGU.00226.2020].

Independent and interactive effects of thermal stress and mental fatigue on manual dexterity

Valenza A.
Primo
;
Bianco A.;
2020

Abstract

Many occupations and sports require high levels of manual dexterity under thermal stress and mental fatigue. Yet, multistressor studies remain scarce. We quantified the interactive effects of thermal stress and mental fatigue on manual dexterity. Seven males (21.1 ± 1.3 yr) underwent six separate 60-min trials characterized by a combination of three air temperatures (hot, 37C; neutral, 21C; cold, 7C) and two mental fatigue states (MF, mental fatigue induced by a 35-min cognitive battery; no-MF, no mental fatigue). Participants performed complex (O'Connor test) and simple (hand-tool test) manual tasks pre- and posttrial to determine stressor-induced performance changes. We monitored participants' rectal temperature and hand skin temperature (Thand) continuously and assessed the reaction time (handclick test) and subjective mental fatigue (5-point scale). Thermal stress (P < 0.0001), but not mental fatigue (P = 0.290), modulated Thand (heat, +3.3C [95% CI: +0.2, +6.5]; cold, 7.5C [10.7, 4.4]). Mental fatigue (P = 0.021), but not thermal stress (P = 0.646), slowed the reaction time (10%) and increased subjective fatigue. Thermal stress and mental fatigue had an interactive effect on the complex manual task (P = 0.040), with cold-no-MF decreasing the performance by 22% [39, 5], whereas neutral-MF, cold-MF, and heat-MF by 36% [53, 19], 34% [52, 17], and 36% [53, 19], respectively. Only mental fatigue decreased the performance in the simple manual task (30% [43, 16] across all thermal conditions; P = 0.002). Cold stress-induced impairments in complex manipulation increase with mental fatigue; yet combined stressors' effects are no greater than those of mental fatigue alone, which also impairs simple manipulation. Mental fatigue poses a greater challenge to manual dexterity than thermal stress.
Valenza A., Charlier H., Bianco A., & Filingeri D. (2020). Independent and interactive effects of thermal stress and mental fatigue on manual dexterity. AMERICAN JOURNAL OF PHYSIOLOGY. REGULATORY, INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 319(6), R703-R711 [10.1152/AJPREGU.00226.2020].
File in questo prodotto:
File Dimensione Formato  
valenza2020.pdf

accesso aperto

Tipologia: Pre-print
Dimensione 455.34 kB
Formato Adobe PDF
455.34 kB Adobe PDF Visualizza/Apri
ajpregu.00226.2020.pdf

non disponibili

Descrizione: Articolo principale
Tipologia: Versione Editoriale
Dimensione 313.21 kB
Formato Adobe PDF
313.21 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/481979
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact