Visual alliesthesia—cloth color preference in the evening under the influence of different light intensities during the daytime

Kim, Sook Hee; Tokura, Hiromi

doi:10.1016/s0031-9384(98)00175-9

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…In our experiment, the level of rectal temperature during the nighttime was not different between the two light conditions. This is incompatible with the findings by Kim and Tokura (1995) and Kim and Tokura (1998). One possible interpretation for these discrepancies is that the subjects were exposed to bright light for a longer period (13 h) in our experiment compared to theirs.…”

Section: Discussioncontrasting

confidence: 98%

“…Therefore, the bright light exposure during the daytime seemed to induce neither "immediate effect" on the level of core temperature during the daytime nor "after effect" during the nighttime. However, Kim and Tokura (1995) and Kim and Tokura (1998) found that the bright light exposure during the daytime lowered rectal temperature during nighttime sleep but it did not affect the daytime level compared to the dim light. Our results during the daytime were consistent with their findings.…”

Section: Discussionmentioning

confidence: 97%

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Effects of Different Light Intensities during the Daytime on Circadian Rhythm of Core Temperature in Humans.

Park

Tokura

1998

Appl Human Sci

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Abstract. The present study was to determine the effects of bright light exposure during the daytime on core temperature rhythm. Eight female students participated as subjects. They were exposed to bright light of 5000 lux or dim light of 200 lux for 13 hours (06:30-19:30) for two consecutive days. Except the sleep period (22:30-06:30) and during the bright light exposure, light intensity was controlled at 200 lux. Rectal temperature data were collected every 10 min throughout the whole experimental period. The mean level of rectal temperature was not significantly different between the bright and the dim light conditions. However, the evening fall and the morning rise of rectal temperature were significantly greater in the bright light conditions on Day 2 compared to the dim. Furthermore, cosinor analysis showed that the acrophase of rectal temperature rhythm was earlier on Day 2 in the bright light conditions than the dim, and was significantly delayed on Day 2 compared to Day 1 in the dim light conditions. These results suggest that low intensity during the daytime for two consecutive days may induce a phase delay of core temperature rhythm rather than the bright light exposure at least in normally entrained female subjects.

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Section: Discussioncontrasting

confidence: 98%

Section: Discussionmentioning

confidence: 97%

Effects of Different Light Intensities during the Daytime on Circadian Rhythm of Core Temperature in Humans.

Park

Tokura

1998

Appl Human Sci

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“…240) of healthy elderly women. Kim and Tokura (1998) found that exposure to bright light from 7:30 a.m. to 6:00 p.m. increased the amplitude of the circadian body temperature rhythm; it became lower at night.…”

Section: Related Results Thousands Of Experiments Havementioning

confidence: 94%

Self-experimentation as a source of new ideas: Ten examples about sleep, mood, health, and weight

Roberts

2004

Behav. Brain Sci.

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“…The increased nocturnal melatonin level achieved under the influence of diurnal bright-light exposure is accompanied at night by a steeper decline of core temperature, greater rise of leg skin temperature (Kim and Tokura, 1995;1998), enhanced parasympathetic activity with lower heart rate , and enhanced activity of gastrointestinal function (Lee et al, 2001;Sone et al, 2003). On the contrary, the suppression of the nocturnal rise of melatonin under the influence of evening and nighttime bright-light exposure is accompanied nocturnally by an attenuated decline in core temperature and reduced increment of lower extremity skin temperature elevation (Kim and Tokura, unpublished data), presumably because of concomitant enhanced activity of the sympathetic nervous system and=or probable reduced activity of parasympathetic nervous system.…”

Section: Discussionmentioning

confidence: 99%

Effect of Evening Exposure to Dim or Bright Light on the Digestion of Carbohydrate in the Supper Meal

Hirota

Sone

Tokura

2003

Chronobiology International

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In a previous study we found that daytime exposure to bright as compared to dim light exerted a beneficial effect on the digestion of the evening meal. This finding prompted us to examine whether the digestion of the evening meal is also affected by evening light intensity. Subjects lived in light of 200 lux during the daytime (08:00-17:00 h) and took their evening meal at 17:00 h under 20 lux (evening dim-light condition: 17:00-02:00 h) or 2000 lux (evening bright-light condition: 17:00-02:00 h) until retiring at 02:00 h. Assessment of carbohydrate digestion of the evening meal was accomplished by a breath hydrogen test that is indicative of the malabsorption of dietary carbohydrate. Hydrogen excretion in the breath in the evening under the dim-light condition was significantly less than under the bright-light condition (p < 0.05). This finding is the opposite to that obtained in previous experiments in which subjects were exposed to the different intensities of light during the daytime, and indicates that the exposure to dim light in the evening exerts a better effect on carbohydrate digestion in the evening meal than does the exposure to bright light.

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Visual alliesthesia—cloth color preference in the evening under the influence of different light intensities during the daytime

Cited by 14 publications

References 17 publications

Effects of Different Light Intensities during the Daytime on Circadian Rhythm of Core Temperature in Humans.

Effects of Different Light Intensities during the Daytime on Circadian Rhythm of Core Temperature in Humans.

Self-experimentation as a source of new ideas: Ten examples about sleep, mood, health, and weight

Effect of Evening Exposure to Dim or Bright Light on the Digestion of Carbohydrate in the Supper Meal

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