[Effect Verification] Nishikawa's PHT Fiber Hybrid Fatigue Recovery Pajamas Demonstrated to Improve Sleep Quality

Nishikawa Co., Ltd. (Headquarters: Chuo-ku, Tokyo; President and COO: Masahiko Takeuchi; hereinafter "nishikawa"), together with the Japan Sleep Science Laboratory, conducted an effect verification study of nishikawa's Hybrid Fatigue Recovery Pajamas using PHT fiber. As a result, wearing this garment was confirmed to improve sleep quality. Additionally, the relaxation effects (influence on the autonomic nervous system) and stress reduction effects brought about by PHT fiber, as well as the thermal effect of the garment's unique structure, were also demonstrated. "PHT" is a special fiber material with minerals such as nano-platinum (DPV576) kneaded into each individual fiber. In this effect verification, the impact of nishikawa's PHT fiber Hybrid Fatigue Recovery Pajamas on sleep was examined through measurement of sleep state using a 3-axis accelerometer-embedded activity meter and subjective evaluation. The results showed that, compared to wearing 100% cotton garments, wearing the PHT fiber Hybrid Fatigue Recovery Pajamas reduced the time to fall asleep by an average of 14 minutes, reduced the total time of waking after sleep onset by an average of 15 minutes, significantly reduced the number of awakenings after sleep onset, and significantly improved sleep efficiency. Furthermore, in the subjective questionnaire responses, items such as "less residual fatigue," "good sleep onset," and "feeling clear-headed" were significantly better. nishikawa's PHT fiber Hybrid Fatigue Recovery Pajamas [Verification Results of Sleep with nishikawa's PHT Fiber Hybrid Fatigue Recovery Pajamas] Subjects: 10 healthy men and women in their 20s to 60s Method: Subjects slept for 4-5 days wearing either 100% cotton garments or PHT fiber* garments. Sleep state during the night was measured with a 3-axis accelerometer-embedded activity meter, and subjects completed a subjective questionnaire upon waking. The order of garment conditions was randomized for each subject, with a washout period of approximately 7 days between conditions. *PHT fiber: Functional patented fiber containing DPV576 Furthermore, the functions of the special fiber material "PHT" have demonstrated a relaxation effect with significantly increased parasympathetic nervous system activity and a stress reduction effect with a rapid decrease in salivary stress substances in a short time. Additionally, nishikawa's PHT fiber Hybrid Fatigue Recovery Pajamas utilize sleep knowledge and adopt a unique structure called "Sleep Flap," designed with longer wrists and ankles. The thermal effect of this unique structure has been confirmed, suggesting that warming the wrists and ankles before sleep makes it easier to fall asleep. ■ Effect Verification of Special Fiber Material "PHT" / Relaxation Effect via Autonomic Nervous System Influence Compared to wearing control garments, wearing PHT fiber garments significantly increased parasympathetic nervous system activity after wearing, indicating a relaxation effect*1. Effect Verification of Special Fiber Material "PHT" / Relaxation Effect via Autonomic Nervous System Influence Subjects: 12 healthy adult males (average age 20.6±1.5 years) Method: Male university soccer club players wore PHT fiber* garments (6 subjects) or control garments (similar commercial products) (6 subjects) during a rest period (3 hours) between morning and afternoon training sessions (each 1.5h). Parasympathetic nervous system activity was evaluated by heart rate variability analysis (pNN50, RMSSD, CVI). *PHT fiber: Functional patented fiber containing DPV576 *1 Effect of wearing clothing containing nano-platinum and nano-diamond (DPV576) fibers on training performance and autonomic nervous system after rest in soccer players. Journal of the Japanese Society of Fatigue Science: 12(2), 69-77 (2017) ■ Effect Verification of Special Fiber Material "PHT" / Stress Reduction Effect Compared to using control bedding, using PHT fiber bedding showed a rapid decrease in salivary stress substances in a short time, indicating stress reduction*2. Effect Verification of Special Fiber Material "PHT" / Stress Reduction Effect Subjects: 15 healthy adult men and women (average age 34.5±7.8 years) Method: Saliva was collected after 30 minutes of quiet sitting, followed by a 5-minute mental arithmetic task to induce stress. After collecting post-stress saliva, subjects rested in a supine position on the test product for 20 minutes. The test products were PHT fiber* bed pads and control bed pads, in a randomized crossover trial. Chromogranin A (CgA), a stress indicator in saliva, was measured. *PHT fiber: Functional patented fiber containing DPV576 *2 Stress reduction effect of a hybrid (DPV576-F) material bed pad using nano-platinum and nano-diamond. Medicine and Biology: 154(2), 86-91 (2010) ■ Thermal Effect Verification of the Unique Structure "Sleep Flap" The "Sleep Flap" (double-layer structure for wrists and ankles), a feature of nishikawa's PHT fiber Hybrid Fatigue Recovery Pajamas, is a structure developed through research by the Japan Sleep Science Laboratory. The Sleep Flap can also be stored inside, allowing for comfortable relaxation. Compared to wearing garments without the "Sleep Flap," wearing garments with the "Sleep Flap" showed that the temperature of the palms and wrists was less likely to decrease. This suggests that preventing cooling of the wrists and palms before sleep improves blood flow to the extremities, making it easier to fall asleep. There is a deep relationship between sleep and core body temperature. Lowering core body temperature allows the brain and body to rest and fall asleep. To lower core body temperature, a system called "heat dissipation" works to release heat from the skin surface. This is why babies' hands and feet become warm before they sleep. Subjects: 10 healthy men and women in their 20s to 50s Method: After acclimatization for 10 minutes in an environment of 15°C and 50% RH, the skin surface temperature of the subjects' wrists and palms was measured with an infrared thermographic camera. Subjects wore a garment without the Sleep Flap or a garment with the Sleep Flap on their right or left arm and rested in a sitting position for 10 minutes. The skin surface temperature of the wrists and palms was measured with an infrared thermographic camera 5 minutes and 10 minutes after wearing. About nishikawa's PHT Fiber Hybrid Fatigue Recovery Pajamas nishikawa's PHT fiber Hybrid Fatigue Recovery Pajamas achieve meticulous details and comfortable wear based on sleep knowledge. "PHT" is a special fiber material with minerals such as nano-platinum (DPV576) kneaded into each individual fiber. The nishikawa-original "Sleep Flap" structure, designed longer to warm the wrists and ankles, provides comfortable warmth before sleep and supports smooth recovery. The design avoids constricting the body and features all-directional stretch, gently fitting the body and allowing for a relaxed rest. Four types of wear with different fabric feels are available: Fit, Jersey, Dry, and Light. Accessories such as eye masks, neck warmers, and leg warmers are also available. Price: Tops (Men's/Women's) ¥14,300~, Bottoms (Men's/Women's) ¥1