Journal of Physiological Anthropology最新文献

{"title":"Longitudinal actigraphy study on sleep patterns under reduced social restrictions in Japanese university students.","authors":"Yuna Enomoto, Hiroko Kubo","doi":"10.1186/s40101-025-00397-4","DOIUrl":"10.1186/s40101-025-00397-4","url":null,"abstract":"<p><strong>Background: </strong>Sleep deprivation and irregular sleep patterns can adversely affect physical and mental health. The COVID-19 pandemic presented a naturalistic opportunity to examine how reduced social time restrictions influence sleep behavior. This study aimed to investigate both group-level and individual-level changes in sleep patterns among Japanese university students before and during the pandemic and to explore how individual characteristics may contribute to these changes.</p><p><strong>Methods: </strong>Twenty-two female university students wore waist-worn actigraphy devices for approximately 16 weeks in both 2019 and 2020. Objective sleep data were collected alongside questionnaire assessments of chronotype, personality traits, and subjective sleep feeling.</p><p><strong>Results: </strong>In total, 4,432 valid days of actigraphy data were analyzed. Compared with the pre-pandemic year, sleep timing was delayed by approximately 20 min for bed-in time and 40 min for bed-out time in 2020. Time in bed (TIB) increased by about 20 min, while total sleep time (TST) remained largely unchanged. Sleep efficiency declined, but subjective sleep feeling remained stable. Individual-level analyses revealed substantial variability: 9 of 22 participants showed significant changes in TST, with both increases and decreases observed. Increased TIB was associated with later bed-out time, shorter baseline sleep duration, and lower neuroticism. A later bed-in time was associated with reduced TST.</p><p><strong>Conclusions: </strong>These findings suggest that while social time restrictions can influence sleep timing and duration, the effects vary considerably across individuals. Earlier bedtimes may be more effective than simply extending TIB in promoting adequate sleep. Furthermore, individual characteristics such as personality traits may play a role in sleep adaptation under changing social contexts. Given the diversity of responses observed, both group- and individual-level perspectives are essential for understanding sleep behavior in real-world settings.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"17"},"PeriodicalIF":3.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12153083/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144267726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Loss of significant association between high-sensitivity C-reactive protein (hs-CRP) and metabolic syndrome after adjustment for waist circumference found in 2022 Korea National Health and Nutrition Examination Survey data.","authors":"Bo-Min Kim, So-Yeon Ryu, Mi-Ah Han, Seong-Woo Choi","doi":"10.1186/s40101-025-00396-5","DOIUrl":"10.1186/s40101-025-00396-5","url":null,"abstract":"<p><strong>Background: </strong>Metabolic syndrome (MetS) is a cluster of metabolic abnormalities that increase the risk of cardiovascular disease and type 2 diabetes. High-sensitivity C-reactive protein (hs-CRP) is a biomarker of systemic inflammation, but its relationship with MetS and its components remains unclear. This study investigates the association between hs-CRP and MetS in a representative Korean population.</p><p><strong>Methods: </strong>Using data from the 2022 Korea National Health and Nutrition Examination Survey (KNHANES), we analyzed 4,823 adults. MetS was defined according to revised NCEP-ATP III criteria. Multivariate analyses were conducted, adjusting for confounders such as sex, age, income, education, smoking, alcohol consumption, physical activity, and waist circumference.</p><p><strong>Results: </strong>Among the study population, 1,784 participants (37.0%) were diagnosed with MetS. hs-CRP levels were significantly higher in individuals with MetS (1.06 mg/L vs. 0.79 mg/L, p < 0.001) and increased with the number of MetS components (p for trend < 0.001). Significant associations were observed between hs-CRP and all MetS components. However, after adjusting for waist circumference, these associations lost statistical significance.</p><p><strong>Conclusion: </strong>This study confirms a strong association between hs-CRP and MetS, primarily influenced by central obesity. The findings highlight abdominal obesity as a key contributor to systemic inflammation in MetS. Further longitudinal studies are needed to explore the causal relationship and underlying mechanisms.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"16"},"PeriodicalIF":3.3,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12139091/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144235671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of blue light during and after exposure on auditory working memory.","authors":"Kyungshil Kim, Koichi Yokosawa, Ken Okada, Hayate Onishi, Yumiko Tan, Sang-Il Lee","doi":"10.1186/s40101-025-00395-6","DOIUrl":"10.1186/s40101-025-00395-6","url":null,"abstract":"<p><strong>Introduction: </strong>Exposure to short-wavelength light (i.e., blue light) has been shown to enhance cognitive function in humans. While most prior studies have focused on visuospatial working memory, the effects of blue light on auditory working memory, particularly tasks involving the phonological loop, remain underexplored. This study investigated both the during- and post-exposure effects of blue light on auditory memory performance.</p><p><strong>Methods: </strong>Fifteen healthy university students (13 males, 2 females; 21.47 ± 1.06 years old) participated in a randomized crossover design. Each participant was exposed to three lighting conditions for approximately 20-min: blue (λ_max = 476 nm, illuminance = 21.84 lx, 13.8 log photons/s-1.cm-2, melanopic EDI = 169.68 lx), amber (λ_max = 580 nm, illuminance = 61.65 lx, 13.5 log photons/s-1.cm-2, melanopic EDI = 2.87 lx) and dim light (baseline; illuminance < 5.00 lx). Each session was separated by a one-week washout period. To mitigate order effects, the sequence of light conditions was randomized across participants. The modified version of the Sternberg working memory task was performed during light exposure and after a 10-min break (i.e., During- vs Post-exposure phase). The accuracy, reaction time, subject anxiety and subject sleepiness were measured.</p><p><strong>Results: </strong>In the post-exposure phase, blue light significantly improved accuracy compared to amber (p < 0.01, d = 0.66) and dim light (p < 0.01, d = 0.67). No significant differences were observed during exposure or in reaction time across three light conditions. Anxiety levels were significantly higher during blue light exposure (vs. amber: p = 0.013, d = 0.96; vs. dim: p = 0.027, d = 0.83), while sleepiness remained unchanged.</p><p><strong>Conclusions: </strong>Blue light exposure may enhance auditory working memory accuracy with a delayed effect, independent of vigilance or processing speed. While these findings are promising, the observed effects are preliminary and require validation in larger and more diverse populations.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"15"},"PeriodicalIF":3.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12096479/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144129331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anthropometric and metabolic differences and distribution of ABCG2 rs2231142 variant between lowland and highland Papuans in West Papua, Indonesia.","authors":"Ferry Fredy Karwur, Monica Hermina Sharon Otline Yocku, Debby Agustin Enoch, Rambu Lawu Nedi Kristanti Retno Triandhini, Venti Agustina, Meyga Feybbi Lakukua, Ferdy Semuel Rondonuwu, Jerry Ferry Langkun","doi":"10.1186/s40101-025-00394-7","DOIUrl":"10.1186/s40101-025-00394-7","url":null,"abstract":"<p><strong>Background: </strong>Papuan people inhabiting the island of New Guinea are the most ancient population living outside Africa, having resided in the region for at least 50,000 years. The arrival of Austronesian speakers and other group from mainland Asia around 3000 years or so created a peculiar genetic mixture, particularly in lowland/coastal areas. We investigated the anthropometric and blood chemical differences alongside the population structure of the ABCG2 rs2231142 genetic variant of West Papuans from lowland/coastal and highland areas to understand metabolic risk differences between these two populations.</p><p><strong>Results: </strong>We studied West Papuan students from lowland/coastal areas (n = 78, 45 males, 33 females) and from highland areas (n = 65, 40 males, 25 females). We found the following: (1) The lowland/coastal Papuans were taller, with lower BMI, central obesity, and triceps. Contrarily, highland Papuans have a more gynoid body shape, with higher WC, HC, WHR, and WHtR. The skinfolds were significantly thicker in women from the highlands. (2) There was actually a negative correlation between BMI and central adiposity with UA and FBG to those from the highlands. The lowland/coastal Papuans indicated an Asian-type metabolic traits, with higher fasting glucose levels at lower BMI and lower central adiposity. (3) UA concentration and DBP were strongly correlated with obesity of the Papuans from lowlands/coasts and not in the Papuans from highlands. (4) There was a striking difference in the ABCG2 rs2231142 > T allele frequency in those from the lowlands/coasts (22%) compared to those from the highlands of West Papua (7%). The T variant in the latter is all heterozygous.</p><p><strong>Conclusions: </strong>The higher adiposity and thicker skinfolds observed in highland Papuans are thought to be adaptive responses to the high-altitude environment, enabling greater adipose tissue expandability and energy storage capacity while maintaining metabolic homeostasis. In contrast, the lowland/coastal Papuans exhibit an Asian metabolic phenotype, which is more prone to metabolic derangements at lower adiposity. Our findings on the population distribution of the ABCG2 rs2231142 > T variant support the idea that its presence in the Papuan highlands is through demic diffusion of the variant from ISEA, indicating that the two populations are separate entities displaying differences in metabolic risks.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"14"},"PeriodicalIF":3.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12090604/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144112473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paced breathing causes tonic change rather than phasic modulation of superficial venous diameter.","authors":"Miharu Matsumoto, Nobuko Hashiguchi, Hiromitsu Kobayashi","doi":"10.1186/s40101-025-00392-9","DOIUrl":"10.1186/s40101-025-00392-9","url":null,"abstract":"<p><strong>Background: </strong>Respiratory modulation is generally observed in the inferior vena cava (IVC). If similar respiratory modulation exists in peripheral superficial veins, it would be possible to dilate the vein diameter by respiratory control. This may improve the success rate of venipuncture in clinical practices. Hence, the present study aimed to investigate the respiratory modulation in peripheral superficial veins.</p><p><strong>Methods: </strong>This study included 21 healthy female volunteers (mean age 21.8 ± 0.9 years). Participants performed spontaneous breathing (SB) and paced breathing (PB). B-mode ultrasound imaging was used to continuously monitor the cutaneous veins of the left elbow fossa for 50 s.</p><p><strong>Results: </strong>Vein diameter demonstrated a clear modulation consistent with paced breathing, and the amplitude of vein diameter modulation was greater at 10 s-PB than at 3 s-PB. Additionally, PB affected the baseline of modulation (mean vein diameter). The baseline exhibited the largest diameter in SB, followed by 3 s-PB and 10 s-PB. The baseline for SB and 10 s-PB demonstrated a statistically significant difference (p = 0.03). Respiratory modulation was confirmed in peripheral superficial veins; however, tonic change in baseline diameter was dominant over phasic modulation. Even when vein diameter was most dilated at 10 s-PB, the diameter at that time was smaller than the mean diameter at SB.</p><p><strong>Conclusions: </strong>This study demonstrated that the peripheral superficial vein diameter exhibited respiratory modulation, similar to the IVC. Although respiratory modulation of the IVC has been well documented in previous studies, the present findings provide novel evidence of this phenomenon in the peripheral superficial veins. Additionally, this study identified tonic changes in the mean vein diameter, which were more dominant than phasic modulations. Furthermore, the mean vein diameter during SB was greater than the maximum diameter observed during 10 s-PB. These findings suggested that PB for 50 s during venipuncture did not enhance venous access.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"13"},"PeriodicalIF":3.3,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12082961/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144086530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effects of waxy barley on defecation, sleep, mental health, and quality of life: a randomized double-blind parallel-group comparison study.","authors":"Mari Honda, Satomi Minato-Inokawa, Kimie Matsuura, Ayaka Ito, Yuko Nitta, Daisuke Kimura, Yutaka Yoshikawa","doi":"10.1186/s40101-025-00393-8","DOIUrl":"https://doi.org/10.1186/s40101-025-00393-8","url":null,"abstract":"<p><strong>Background: </strong>Dietary fiber (DF) is beneficial for preventing constipation, and the metabolites produced by gut microbiota fermentation are suggested to positively influence on depression and sleep. Additionally, constipation has been reported to affect mental health and health-related quality of life (HRQoL). This study aimed to increase DF intake and examined its effects on daily DF and β-G consumption using two types of waxy barley (WB), rich in DF with varying β-glucan (β-G) content. Additionally, this study examined the effects of WB consumption on defecation, sleep, mental health, and HRQoL.</p><p><strong>Methods: </strong>A randomized double-blind parallel-group comparison study was conducted on 68 young Japanese women, using Kirarimochi (Group K) as common WB cultivar and Fukumi Fiber (Group F) as high-β-G WB cultivar. Participants consumed WB rice for 4 weeks, targeting 3 g/day of β-G (48 g/day of WB). We estimated the intake of WB and DF including β-G from the daily records. Defecation was evaluated through daily records and Rome IV criteria-based surveys. Sleep, mental health, and HRQoL were evaluated using PSQI-J, J-PHQ-9, and SF-36, respectively.</p><p><strong>Results: </strong>Both groups consumed about 40 g/day of WB. DF and β-G intakes from barley were 6.3 g/2.5 g in Group K and 10.7 g/4.3 g in Group F. Regarding defecation, both groups showed increases defecation days, defecation frequency and stool amount, with no differences between groups. Regarding sleep, Group F showed a decrease (improvement) in the PSQI global score, with improvements noted between groups. Regarding mental health, both groups showed decreases (improvements) in the PHQ-9 score, with Group F showing improvement between groups. Regarding HRQoL, summary scores showed improvements: physical health in Group K and mental health in Group F.</p><p><strong>Conclusion: </strong>To increase β-G intake, high-β-G WB cultivars are effective; however, WB cultivars overall can potentially serve as excellent sources of DF. Effects on defecation may be expected not only from high-β-G WB but also from common WB with β-G intake below the target of 3 g/day. Although high β-G WB may have more beneficial for sleep and mental health, additional studies are required.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"12"},"PeriodicalIF":3.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12057101/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144057847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Brown fat thermogenesis and cold adaptation in humans.","authors":"Takeshi Yoneshiro, Mami Matsushita, Juro Sakai, Masayuki Saito","doi":"10.1186/s40101-025-00391-w","DOIUrl":"https://doi.org/10.1186/s40101-025-00391-w","url":null,"abstract":"<p><p>Brown adipose tissue (BAT) is a site of non-shivering thermogenesis (NST) in mammals. Since the rediscovery of BAT in adult humans, there has been a remarkable advance in human BAT researches, revealing the significant roles of this thermogenic tissue in cold-induced NST and cold adaptation. Cold stress influences BAT in various time spans: acute cold exposure promptly activates BAT to induce NST, which contributes to immediate maintenance of body temperature. Prolonged cold exposure recruits BAT, resulting in increased capacity of NST and improved cold tolerance. Such BAT adaptation not only occurs in the exposed individual but also is passed on to the next generation, probably via the paternal lineage. As such, BAT plays a role in acute, chronic, and transgenerational adaptation to cold environment in humans.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"11"},"PeriodicalIF":3.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12010580/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144054904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resting-state blink rate does not increase following very-light-intensity exercise, but individual variation predicts executive function enhancement levels.","authors":"Ryuta Kuwamizu, Yudai Yamazaki, Naoki Aoike, Dongmin Lee, Hideaki Soya","doi":"10.1186/s40101-025-00390-x","DOIUrl":"https://doi.org/10.1186/s40101-025-00390-x","url":null,"abstract":"<p><strong>Background: </strong>Acute physical exercise, even at a very-light-intensity, potentiates prefrontal cortex activation and improves executive function. The underlying circuit mechanisms in the brain remain poorly understood, though we speculate a potential involvement of arousal-related neuromodulatory systems. Recently, our rodent study demonstrated that exercise, even at light-intensity, activates the midbrain dopaminergic neurons. Resting-state spontaneous eye blink rate is linked to brain-arousal neural circuits, and potentially to those modulated by dopaminergic system. We hypothesized that neural substrates linked to resting-state eye blink rate contribute to the cognitive impact of acute very-light-intensity exercise.</p><p><strong>Method: </strong>We analyzed data from a previous study with a renewed focus on resting-state eye blink rate. Twenty-four healthy young adults completed both 10 min of cycling (very-light-intensity exercise: 30% peak oxygen uptake) and rest conditions. Resting-state eye blink rate and Stroop task performance were measured before and after both exercise and resting control.</p><p><strong>Results: </strong>Results showed no significant differences in eye blink rate changes between conditions. However, correlation analyses revealed that exercise-induced changes in resting-state eye blink rate were significantly associated with individual variations in Stroop task performance enhancement.</p><p><strong>Conclusion: </strong>Very-light-intensity exercise does not elicit a consistent increase in eye blink rate after exercise. This finding does not support the involvement of a blink increase-linked neural substrate in enhancing executive function through very-light-intensity exercise. However, resting-state eye blink rate that is altered by exercise is predictive of executive function enhancement levels; this may serve as a novel contactless biomarker for predicting exercise benefits for brain health and cognition.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"10"},"PeriodicalIF":3.3,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11995553/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144035229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gender differences in exercise efficiency: the influence of adiposity during low-intensity cycling in healthy Lebanese university students.","authors":"Elie-Jacques Fares, Rédina Berkachy, Sarah Zaki","doi":"10.1186/s40101-025-00389-4","DOIUrl":"10.1186/s40101-025-00389-4","url":null,"abstract":"<p><strong>Introduction: </strong>Low-intensity physical activity plays a key role in weight regulation, and reduced engagement in such activities is associated with rising obesity rates. This study explored the relationship between body fat distribution and exercise efficiency during low-intensity cycling, comparable to everyday life, focusing on adiposity in men and women.</p><p><strong>Methods: </strong>Thirty participants (50% women and 50% men) underwent basal metabolic rate (BMR) measurements after an overnight fast. Following 500 ml water intake, they cycled at 60 rpm for 5 min at four intensities (20 W, 40 W, 60 W, 80 W), with respiratory parameters (i.e., energy expenditure (EE)) recorded using an indirect calorimeter system. Spearman correlations were used to assess the relationships among BMI, total body and trunk fat percentages, and delta efficiency (DE), which quantifies the energy cost associated with incremental work output during exercise.</p><p><strong>Results: </strong>A linear increase in EE with increasing power output was observed in both men and women, with men showing a slightly higher EE across all power levels. The linear regression equations for power between 20 and 80 W were highly predictive, with R² values of 0.999 for men and 0.995 for women. Additionally, significant positive correlations were observed between BMI, fat percentage, trunk and limb fat percentages, and delta efficiency (DE) in women, explaining 45.7%, 34.7%, 34.1%, and 29.7% of the variance in DE, respectively. No significant correlations were found between these variables in men.</p><p><strong>Conclusion: </strong>This study demonstrated that body fat distribution, particularly in women, is significantly associated with exercise efficiency during low-intensity cycling. These findings highlight the need for larger studies that incorporate gender-specific considerations in exercise and targeted interventions.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"9"},"PeriodicalIF":3.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11900605/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143617603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between age and various muscle quality indices in Japanese individuals via bioelectrical impedance analysis (BIA).","authors":"Kazushige Oshita, Akihisa Hikita, Ryota Myotsuzono, Yujiro Ishihara","doi":"10.1186/s40101-025-00388-5","DOIUrl":"10.1186/s40101-025-00388-5","url":null,"abstract":"<p><strong>Background: </strong>Bioelectrical impedance analysis (BIA) is widely used as a convenient method of measuring body composition. The validity of the phase angle (PhA), impedance rate (IR), and resistance rate (RR) as indices of muscle quality using BIA has been suggested. This study aimed to investigate the relationship between these muscle quality indices and age, and to clarify their characteristics.</p><p><strong>Methods: </strong>The appendicular muscle mass (AMM), AMM corrected for body mass index (AMM/BMI), PhA, IR, and RR were determined using BIA in 1376 Japanese individuals (532 males and 844 females) aged 15-95 years. The PhA was determined from a 50-kHz current, and the IR and RR were determined from the impedance and resistance ratios between the 250- and 5-kHz currents.</p><p><strong>Results: </strong>AMM/BMI showed greater age-related changes than the other indices of muscle mass. Significant differences in PhA, IR, and RR were found for the whole body at age ≥ 50 years and for the lower limbs at age ≥ 30 years, compared to those in their 20 s. For the arms, age-related changes were small, and significant differences in PhA of females were only observed at aged ≥ 85 years, whereas significant differences in IR and RR were observed at aged ≥ 75 years, compared to those in their 20s.</p><p><strong>Conclusion: </strong>These results suggest that although PhA, IR, and RR in the whole body and lower limbs showed age-related changes, the change in PhA in the upper body was small, especially in females. However, IR and RR in the upper limbs of females reflected age-related changes more than PhA.</p>","PeriodicalId":48730,"journal":{"name":"Journal of Physiological Anthropology","volume":"44 1","pages":"8"},"PeriodicalIF":3.3,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11881323/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143568648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}