Publications

Major achievements

Papers

  • Insung Park, Hitomi Ogata, Kumpei Tokuyama. Algorithm for transient response of human open-circuit whole-room indirect calorimetry: a review and future perspective. Physiological Reports (in press)
  • Insung Park, Yufei Cui, Fusae Kawana, Morie Tominaga, Riku Miyamura, Hiroshi Yamagishi, Masayasu Okado, Masashi Miyamura, Shuji Nakamura, Chiemi Tanigawa, Toshio Kokubo, Masashi Yanagisawa, Kumpei Tokuyama. Subjective and objective quality of sleep with radiant or convection cooling systems: a randomized, cross-over trial. Scientific Reports 15: 35119, 2025.
  • Jaehee Lee, Koki Nagata, Jaehoon Seol, Insung Park, Kumpei Tokuyama, Masashi Yanagisawa, Tomohiro Okura. Multi-task exercise increases delta power in non-rapid eye movement sleep among older female adults: A randomized crossover trial. NeuroImage 310: 121105, 2025
  • Akiko Uchizawa, Haruka Osumi, Simeng Zhang, Katsuhiko Yajima, Airi Funayama, Emi Kondo,
    Yoko Suzuki, Yoshiaki Tanaka, Insung Park, Yasushi Enomoto, Naomi Omi, Kumpei Tokuyama,
  • Hiroyuki Sagayama. Energy expenditure and slow-wave sleep in runners: Focusing on reproductive function, chronic training, and sex. iScience 28(2): 111717, 2025
  • Insung Park, Rikako Yoshitake, Kazuki Kioka, Asuka Ishihara, Katsuhiko Yajima, Fusae Kawana, Toshio Kokubo, Ichiyo Matsuzaki, Takashi Kanbayashi, Masashi Yanagisawa, Kumpei Tokuyama. Orexin receptor antagonist increases fat oxidation and suppresses protein catabolism during sleep in humans. iScience 27(7): 110212, 2024
  • Hyoeun Bae*, Insung Park*, Eunyeon Joo. (*These authors contributed equally to this work.) Assessing the effect of carbon dioxide exposure on sleep stability in insomnia patients using the envelope analysis. Sleep Medicine Research 21(1): 44-55, 2024
  • Katsuhiko Yajima, Shuto Chiba, Insung Park, Hitomi Ogata, Momoko Kayaba, Asuka Ishihara, Yoshiaki Tanaka, Simeng Zhang, Jaehoon Seol, Masanori Katakura, and Kumpei Tokuyama. Dietary palmitic acid to oleic acid ratio modulates energy metabolism and biological rhythms in young healthy Japanese males. British Journal of Nutrition 13: 447-460, 2024
  • Jaehoon Seol, Chihiro Kokudo, Insung Park, Simeng Zhang, Katsuhiko Yajima, Tomohiro Okura, Kumpei Tokuyama. Energy metabolism and thermoregulation during sleep in young and old females. Scientific Reports 13: 10416, 2023
  • Rikako Yoshitake, Insung Park, Hitomi Ogata, Naomi Omi. Meal Timing and Sleeping Energy Metabolism. Nutrients 15(3): 763, 2023
  • Insung Park, Chihiro Kokudo, Jaehoon Seol, Asuka Ishihara, Simeng Zhang, Akiko Uchizawa, Haruka Osumi, Ryusuke Miyamoto, Kazumasa Horie, Chihiro Suzuki, Yoko Suzuki, Tomohiro Okura, Diaz Javier, Kaspar Emanuel Vogt, Kumpei Tokuyama. Instability of NREM sleep in older women evaluated by sleep-stage transition and envelope analyses. Frontiers in Aging Neuroscience 14: 1050648, 2022 doi: 10.3389/fnagi.2022.1050648
  • Jaehoon Seol, Jaehee Lee, Insung Park, Kumpei Tokuyama, Shoji Fukusumi, Toshio Kokubo, Masashi Yanagisawa, Tomohiro Okura. Bidirectional associations between physical activity and sleep in older adults: a multilevel analysis using polysomnography. Scientific Reports 12(1): 15399, 2022
  • Insung Park, Kumpei Tokuyama, Makoto Satoh. Exploring the effect of exercise to promote quality of sleep: Insight from exercise and quality of sleep on the new analytical method. Descente Sports Science (ISSN: 0285-5739) 42:183-194, 2022
  • Sachiko Ito Uemura, Aya Imanishi, Yoshino Terui, Insung Park, Masahiro Satake, GoEun Han, Takanobu Shioya, Seiji Nishino, Takashi Kanbayashi. Residual effects of low dose of suvorexant, zolpidem, and ramelteon in healthy elderly subjects: A randomized double-blind study. Neuropsychopharmacology Reports 42(3):288−298, 2022
  • Youngju Choi, Yuki Nakamura, Nobuhiko Akazawa, Insung Park, Hyo-Bum Kwak, Kumpei Tokuyama, and Seiji Maeda. Effects of nocturnal light exposure on circadian rhythm and energy metabolism in healthy adults: a randomized crossover trial. Chronobiology International 39(4):602-612, 2022 doi:10.1080/07420528.2021.2014517
  • Simeng Zhang, Yoshiaki Tanaka, Asuka Ishihara, Akiko Uchizawa, Insung Park, Kaito Iwayama, Hitomi Ogata, Katsuhiko Yajima, Naomi Omi, Makoto Satoh, Masashi Yanagisawa, Hiroyuki Sagayama, Kumpei Tokuyama. Metabolic Flexibility during Sleep. Scientific Reports 11:17849, 2021
  • Insung Park, Javier Diaz, Sumire Matsumoto, Kaito Iwayama, Yoshiharu Nabekura, Hitomi Ogata, Momoko Kayaba, Atsushi Aoyagi, Katsuhiko Yajima, Makoto Satoh, Kumpei Tokuyama, Kaspar E. Vogt. Exercise Improves the Quality of Slow-Wave Sleep by Increasing Slow-Wave Stability. Scientific Reports 11:4410, 2021
  • Asuka Ishihara, Insung Park, Yoko Suzuki, Katsuhiko Yajima, Huiyun Cui, Masashi Yanagisawa, Takeshi Sano, Junji Kido, Kumpei Tokuyama. Metabolic responses to polychromatic LED and OLED light at night. Scientific Reports 11:12402, 2021
  • Insung Park, Chihiro Suzuki, Yoko Suzuki, Fusae Kawana, Katsuhiko Yajima, Shoji Fukusumi, Toshio Kokubo, Kumpei Tokuyama, Masashi Yanagisawa, Makoto Satoh. Effects of body pillow use on sleeping posture and sleep architecture in healthy young adults. Sleep Medicine Research 12(1): 57-63, 2021
  • Akiko Uchizawa, Masanobu Hibi, Hiroyuki Sagayama, Simeng Zhang, Haruka Osumi, Yoshiaki Tanaka, Insung Park, Kumpei Tokuyama, Naomi Omi. Novel Equations to Estimate Resting Energy Expenditure During Sitting and Sleeping. Annals of Nutrition and Metabolism 77:159-167, 2021
  • Yoshiaki Tanaka, Hitomi Ogata, Insung Park, Akira Ando, Asuka Ishihara, Momoko Kayaba, Katsuhiko Yajima, Chihiro Suzuki, Akihiro Araki, Haruka Osumi, Simeng Zhang, Seol Jaehoon, Keigo Takahashi, Yoshiharu Nabekura, Makoto Satoh, Kumpei Tokuyama. Effect of a single bout of morning or afternoon exercise on glucose fluctuation in young healthy men. Physiological Reports 9: e14784, 2021
  • Jaehoon Seol, Insung Park, Chihiro Kokudo, Simeng Zhang, Chihiro Suzuki, Katsuhiko Yajima, Makoto Satoh, Kumpei Tokuyama, Tomohiro Okura. Distinct Effects of Low-Intensity Physical Activity in the Evening on Sleep Quality in Older Women: A Comparison of Exercise and Housework. Experimental Gerontology 143:111165, 2021
  • Simeng Zhang, Jiro Takano, Norihito Murayama, Morie Tominaga, Takashi Abe, Insung Park, Jaehoon Seol, Asuka Ishihara, Yoshiaki Tanaka, Katsuhiko Yajima, Yoko Suzuki, Chihiro Suzuki, Shoji Fukusumi, Masashi Yanagisawa, Toshio Kokubo, Kumpei Tokuyama. Subacute ingestion of caffeine and oolong tea increases fat oxidation without affecting energy expenditure and sleep architecture: a randomized, placebo-controlled, double-blinded cross-over trial. Nutrients 12(12):3671, 2020
  • Kaito Iwayama, Ayane Ogawa, Yoshiaki Tanaka, Katsuhiko Yajima, Insung Park, Akira Ando, Hitomi Ogata, Momoko Kayaba, Simeng Zhang, Fumiya Tanji, Yoshiharu Nabekura, Kouhei Yamamoto, Kumpei Tokuyama. Effects of exercise before breakfast on plasma free fatty acid profile and 24-h fat oxidation. Metabolism Open 8:100067, 2020
  • Hitomi Ogata, Masaki Horie, Momoko Kayaba, Yoshiaki Tanaka, Akira Ando, Insung Park, Simeng Zhang, Katsuhiko Yajima, Jun-ichi Shoda, Naomi Omi, Miki Kaneko, Ken Kiyono, Makoto Satoh, and Kumpei Tokuyama. Skipping breakfast for 6 days delayed the circadian rhythm of the body temperature but the peak time of clock genes expression remained unchanged in human leukocyte. Nutrients 12(9): 2797, 2020
  • Yoshiaki T, Hitomi O, Momoko K, Akira A, Insung P, Katsuhiko Y, Akihiro A, Chihiro S, Haruka O,Simeng Z, Asuka I, Keigo T, Junichi S, Yoshiharu N, Makoto S, and Kumpei T.
 Effect of a single bout of exercise on clock gene expression in human leukocyte. J Appl Physiol. 2020 Apr 1;128(4):847-854
  • Simeng Z, Yoko S, Makoto S, Haruka O, Akiko U, Yoshiaki T, Asuka I, Haruka H, Katsuhiko Y, Insung P, Jaehoon S, Naomi O, Kumpei T, Changes in sleeping energy metabolism and thermoregulation during menstrual cycle. Physiol Rep. 2020;8: e14353
  • Hitomi O, Momoko K, Yoshiaki T, Katsuhiko Y, Kaito I, Akira A, Insung P, Ken K, Naomi O,Makoto S, and Kumpei T. Effect of skipping breakfast for 6 days on energy metabolism and diurnal rhythm of blood glucose in young healthy Japanese males. Am J Clin Nutr. 2019 Jul 1;110(1):41-52
  • Katsuhiko Y, Kaito I, Hitomi O, Insung P, Kumpei T. Meal rich in rapeseed oil increases 24-h fat oxidation more than meal rich in palm oil. PLoS One. 2018 Jun 14;13(6): e0198858
  • Kaito I, Ryosuke K, Yoshiharu N, Reiko K, Insung P, Masashi K, Hitomi O, Momoko K, Naomi O, Makoto S, Kumpei T. Exercise before breakfast increases 24-h fat oxidation in female subjects. LoS One. 2017 Jul 10;12(7): e0180472
  • Insung P, Ryuji O, Hitomi O, Momoko K, Sayaka H, Masanobu H, Yoshihisa K, Makoto S and Kumpei T. Effects of subacute ingestion of chlorogenic acids on sleep architecture and energy metabolism through activity of the autonomic nervous system:
a randomised, placebo-controlled, double-blinded cross-over trial. Br J Nutr. 2017 Apr;117(7):979-984.
  • Kayaba M, Park I, Iwayama K, Seya Y, Ogata H, Yajima K, Satoh M, Tokuyama K. Energy metabolism differs between sleep stages and begins to increase prior to awakening. Metabolism. 2017 Apr; 69:14-23.
  • Hitomi O, Fumi K, Masanobu H, Shigeho T & Kumpei T. A Novel Approach to Calculating the Thermic Effect of Food in a Metabolic Chamber. Physiol Rep. 2016 Feb;4(4): e12717
  • Iwayama K, Kawabuchi R, Park I, Kurihara R, Kobayashi M, Hibi M, Oishi S, Yasunaga K, Ogata H, Nabekura Y, Tokuyama K. Transient energy deficit induced by exercise increases 24-h fat oxidation in young trained men. J Appl Physiol (1985).2015 Jan 1;118(1):80-5.
  • Kaito I, Reiko K, Yoshiharu N, Ryosuke K, Insung P, Masashi K, Hitomi O, Momoko K, Makoto S, Kumpei T. Exercise Increases 24-h Fat Oxidation Only When It Is Performed Before Breakfast.BioMedicine. 2015 Oct 30;2(12):2003-9.
  • Yasuo S, Kazuteru N, Hitomi O, Yoshiharu N, Shoichiro N, Kumpei T. Continuous Glucose Monitoring During a 100-km Race: A Case Study in an Elite Ultramarathon Runner. Int J Sports Physiol Perform. 2015 Jan;10(1):124-7.
  • Momoko K, Kaito I, Hitomi O, Yumi S, Ken K, Makoto S, Kumpei T. Erratum To: The Effect of Nocturnal Blue Light Exposure From Light-Emitting Diodes on Wakefulness and Energy Metabolism the Following Morning. Environ Health Prev Med. 2015 Jan;20(1):76-7.