Japanese Journal of Physiological Anthropology
Online ISSN : 2432-0986
Print ISSN : 1342-3215
Volume 29
Displaying 1-7 of 7 articles from this issue
  • Kazuhiko YAMASAKI, Yumi NASU, Airi MURAKOSHI
    2024Volume 29 Pages 3-13
    Published: 2024
    Released on J-STAGE: July 10, 2024
    JOURNAL FREE ACCESS

    Our study involved 12 adult females. In the first series, we compared clothing conditions O and C, both of which have a clo value of 1.00 clo at 21.2°C. The clo values of clothes at the lower extremities were 0.27 and 0.45 under conditions O and C, respectively. In the second series, we compared clothing conditions S and L, both of which have a clo value of 0.22 clo at 28.2°C. The clo values of clothes at the lower extremities were 0.06 and 0.10 under conditions S and L, respectively. When comparing the clothing conditions between O and C, no significant difference was found in the whole-body thermal sensation. However, local thermal sensations for the lower legs and feet were considerably higher under clothing condition C than those under clothing condition O. Similarly, when comparing the clothing conditions between S and L, no significant difference was found in the whole-body thermal sensation. However, local thermal sensations for the thighs were substantially higher under clothing condition L than those under clothing condition S. In many instances across both series, a remarkable correlation between the whole-body and local thermal sensations was observed.

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  • Ryouta MATSUURA, Kino TAKATSUJI, Takehide KIMURA
    2024Volume 29 Pages 15-26
    Published: 2024
    Released on J-STAGE: September 28, 2024
    JOURNAL FREE ACCESS

    This study aimed to determine the effects of mental fatigue on muscle activity and exhaustion during sustained submaximal handgrip contraction at different arm postures. Healthy volunteers performed sustained handgrip contractions at 30% maximum voluntary contraction until exhaustion in the 90° of shoulder flexion position (PROX condition) or neutral position (DIST condition) after a 30-min Stroop task (MF condition) or watching documentary task (control [CON] condition). The time to task failure did not differ significantly among the four conditions. The electromyography values recorded from the anterior deltoid were significantly higher in the MF than CON condition, but only in the PROX condition. This study indicates that mental fatigue does not influence sustained handgrip contraction performance but does increase muscle activity of anterior deltoid with shoulder flexion angles.

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