Physiology international最新文献

Introduction: Fatigue accumulation in the final 100 m of a 400-m sprint impairs neuromuscular coordination and biomechanics, often resulting in performance decline. This study investigated how fatigue affects lower-limb coordination, joint mechanics, and recovery patterns in competitive sprinters.

Methods: A randomized controlled trial was conducted with 30 trained male Chinese 400-m sprinters (age: 29.8 ± 2.7 years), allocated into control (n = 15) and experimental (n = 15) groups. The experimental group completed five 80-m maximal sprints with decreasing rest intervals before running a 400-m sprint; the control group performed only the 400-m sprint. Kinematic and EMG data were recorded during the final 100 m. Recovery measures-Rating of Perceived Exertion (RPE), Jump Height, Peak Force, and Peak Power-were assessed at 30 min, 1 h, 3 h, and 36 h post-sprint. Data were analysed using two-way ANOVA and paired t-tests.

Results: Fatigue significantly increased stride variability in the experimental group from 0.022 ± 0.010 m (Session I) to 0.035 ± 0.012 m (Session II, P < 0.0001), while hip flexion decreased from 33.1 ± 4.5° to 26.7 ± 3.9° (P = 0.0012), and CRP rose from 15.6 ± 2.9° to 24.1 ± 4.2° (P = 0.002). EMG activation declined in key muscles, including Rectus Femoris (0.28 ± 0.05 to 0.23 ± 0.05, P = 0.0035) and Soleus (0.21 ± 0.05 to 0.18 ± 0.04, P = 0.0003). RPE increased from 10.9 ± 2.05 to 19.5 ± 1.20 at 30 min post-sprint (P < 0.0001), with Jump Height decreasing from 49.5 ± 5.02 cm to 34.8 ± 5.10 cm (P < 0.0001), Peak Force from 17.8 ± 1.28 to 15.1 ± 1.42 N kg-1 (P = 0.0012), and Peak Power from 65.7 ± 6.03 to 50.4 ± 4.95 W kg-1 (P < 0.0001).

Conclusion: Fatigue in the final sprint phase significantly impairs joint coordination, muscle activation, and power output. These findings highlight the need for targeted fatigue-resistance training and individualized recovery protocols. A limitation is the all-male sample, which may affect generalizability.

Introduction: Gestational diabetes mellitus (GDM) is an endocrine-metabolic disorder that develops during pregnancy. Glucose transporters (GLUTs), which facilitate the transport of glucose across the plasma membrane (facilitated diffusion) play a key role in the progression of this disease.

Objective: This study aimed to analyze the general characteristics and expression of GLUTs in GDM.

Methods: This systematic review was performed following the PRISMA guidelines. A literature search was performed without language restrictions using the PubMed, Web of Science, Redalyc, Google Scholar, Cochrane, and Scopus databases between 2010 and 2023 using the keywords GLUT, Gestational diabetes mellitus, GDM and GLUT, Glucose metabolism and GLUT, Glucose receptors to identify most human studies, as the majorityof studies use murine models, focusing on a positive diagnosis of GDM.

Results: A total of 36 articles were included in this review. Of the 36 articles, 21 described the general characteristics of GLUTs, and 15 were scientific reports (12 in humans and 3 in animals). The studies showed that interleukin-2, tumor necrosis factor-α, and leptin correlated negatively with the expression of GLUT1 in patients with GDM. The three murine studies showed that hyperglycemia was associated with decreased GLUT2 expression.

Conclusions: Evidence of GLUT expression at the gestational stage provides a better understanding of fetal life conditions and how they contribute to the development of GDM. Therefore, analyzing GLUT expression serves as a preventive measure.

Exercise-induced fatigue and inflammation can significantly impair athletic performance and recovery. Effective strategies to mitigate these effects are critical for athletes and those engaged in high-intensity physical activities. Anti-inflammatory properties have been associated with Antarctic krill oil (AKO), which contains n-3 polyunsaturated fatty acids (n-3 PUFA) such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). After exhaustive exercise, this study examined how 4-week AKO supplementation affected skeletal muscle inflammation and the TLR4/MyD88/NF-κB signaling pathways in mice. Sixty male SPF-grade 8-week-old C57BL/6J mice were randomly assigned to four groups: soybean oil control (BO-C), AKO control (KO-C), soybean oil exercise (BO-E), and AKO exercise (KO-E). The KO groups received 200 mg/kg/BW AKO intragastrically for four weeks, while the BO groups received an equivalent volume of soybean oil. After the supplementation period, the exercise groups underwent a strenuous treadmill exercise. Grasping force was measured at 0 h, 6 h, 24 h, 48 h, and 72 h post-exercise, and tissue samples were analyzed histologically and biochemically. Results showed that AKO significantly reduced body weight and enhanced exercise endurance and recovery. Furthermore, serum CK, LDH and CRP levels, as well as muscle TNF-α concentrations, and TLR4 and MyD88 protein expressions were lower in the KO-E group than in the BO-E group. As a result of modulating the TLR4/MyD88/NF-κB signaling pathway through AKO supplementation, it decreases inflammation after exhaustive exercise and promotes recovery.

Background: Adipose-derived stem cell (ADSC) derived exosomes have been widely studied in disease treatment. Exosomes are able to deliver bioactive molecules, including non-coding RNAs and proteins. Long non-coding RNAs (lncRNAs) are non-coding RNAs longer than 200 nucleotides and are enriched in exosomes. This work aimed to explore the effects of lncRNA KLF3 antisense RNA 1 (KLF3-AS1) that delivered by ADSC-derived exosomes on ovarian aging.

Methods: ADSCs were isolated and characterized with the surface biomarkers. Exosomes were isolated from ADSCs. The biomarkers of ADSC-derived exosomes were identified using western blotting. Exosomes were labeled with PKH26 and internalized by primary granulosa cells (pGCs), and relative images were taken under fluorescence microscope. ADSCs were transfected with KLF3-AS1, and exosomes were isolated for treatment of aging female mice. The ovary weight was recorded. The follicular development was measured by Hematoxylin and eosin (H&E) staining and Masson's trichrome staining. Apoptosis of ovary tissues was detected by TUNEL assay. The senescence and apoptosis of pGCs were determined by S-β-gal staining kit and Annexin V/PI detection kit. RNA pulldown and RNA Immunoprecipitation Chip (RIP) assay were performed to determine the interaction of Y box binding protein 1 (YBX1) with KLF3-AS1.

Results: The ADSC-derived exosomes could deliver KLF3-AS1 to pGCs. Treatment with ADSC-derived exosomes notably elevated the ovary weight and enhanced follicular development in aged mice, whereas depletion of KLF3-AS1 reversed these effects and promoted cell apoptosis. ADSCs-derived exosomes alleviated senescence and apoptosis of pGCs, while KLF3-AS1 depletion blocked these phenotypes. KLF3-AS1 directly interacts with YBX1. KLF3-AS1 depletion inhibited phosphorylation of PI3K, Akt, and mTOR in pGC, and overexpression of YBX1 reversed these phenotypes.

Conclusion: ADSC-derived exosomal KLF3-AS1 could improve ovary aging and enhance pGC viability via targeting the YBX1 and PI3K/AKT/mTOR signaling.

Objective: Although SARS-CoV-2 primarily targets the respiratory system, there is evidence that it can also infect the central nervous system, especially in children, leading to neurological symptoms and long-term consequences. It is imperative to summarize the possible mechanisms, main symptoms, and treatments of neurological symptoms of COVID-19 in children.

Methods: We performed a literature search using the PubMed online database to find studies investigating the mechanisms of COVID-19 infection of the central nervous system and therapies for COVID-19 neurological symptoms in children.

Results: The main mechanisms of action of SARS-CoV-2 virus on the nervous system are direct invasion, systemic inflammation and molecular mimicry. Although the incidence of adverse reactions to intravenous IgG therapy (IVIG) varies greatly and the contraindications are not yet clear, IVIG has been shown to be clearly effective for the neurological symptoms of COVID-19 in children.

Conclusion: However, due to insufficient data, more clinical studies are still needed to confirm its safety and efficacy, further improve the treatment plan, and determine the appropriate dosage to better serve clinical practice.

Significance: The specific regimen of IVIG treatment for COVID-19 in children was explored, which further improved the understanding of COVID-19 and L-C19 neurological diseases in children.

Objective: This study aimed to investigate the role of levetiracetam (LEV) and gabapentin (GBP) on mechanical and thermal pain thresholds, as well as n-acetylcysteine (NAC) as an adjuvant, in the pentylenetetrazol (PTZ)-induced post-traumatic epilepsy (PTE) model after mild-traumatic brain injury (TBI) in male Sprague-Dawley rats.

Methods: Animals were randomly divided into 7 groups (Control, PTE, PTE+LEV, PTE+GBP, PTE+NAC, PTE+LEV+NAC and PTE+GBP+NAC). Rats received 50 mg kg-1 LEV, 100 mg kg-1 GBP, and combinations of these antiepileptics with 100 mg kg-1 NAC for 14 days after TBI.

Results: While the thermal pain threshold decreased significantly in the PTE group (P < 0.05), it increased in the PTE+LEV, PTE+GBP, and PTE+LEV+NAC groups (P < 0.05, P < 0.001 and P < 0.01, respectively). Interestingly, NAC alone did not affect the thermal pain threshold, but the combination of PTE+LEV+NAC increased the thermal pain threshold. Furthermore, PTE+GBP+NAC administration prevented the effect of GBP on the thermal pain threshold.

Conclusions: The presented study is the first to examine the effect of LEV and GBP in PTE. It was found that PTE decreased the thermal pain threshold, but LEV and GBP applied for 14 days prevented the decrease in PTE-related pain threshold and increased the thermal pain threshold. NAC, which was used as an adjuvant to support antiepileptic drugs, did not influence the thermal pain threshold alone; however, it increased the pain threshold more by potentiating the effect of LEV. Both LEV and GBP have an antihyperalgesic effect in the PTE model facilitated by PTZ, and NAC further reinforces the antihyperalgesic effect of LEV.

Background: Hemiplegia, a common neurological consequence of moderate to severe traumatic brain injury (TBI) significantly impacts patients' motor and daily living functions. In China, standard treatments for hemiplegia include physical rehabilitation and traditional acupuncture. Scalp acupuncture, rooted in traditional Chinese medicine, has gained attention as a potential alternative. This study compared the efficacy of scalp acupuncture combined with conventional therapy versus conventional therapy alone in improving limb function recovery in patients with hemiplegia after moderate to severe TBI.

Methods: This open-label, single-site, parallel-group randomized trial included 117 patients with hemiplegia post-TBI. Patients were randomized into a control group (n = 58) receiving conventional interventions, and a scalp acupuncture group (n = 59) receiving scalp acupuncture in addition to conventional care. Scalp acupuncture was administered daily for 8 weeks using standardized acupuncture points. Outcome measures included the Brunnstrom Hemiplegia Motor Function Scale, the Fugl-Meyer Assessment (FMA) scale, the modified Barthel Index (MBI), cerebral blood flow assessment (via color Doppler ultrasonography), and serum brain-derived neurotrophic factor (BDNF) levels.

Results: The scalp acupuncture group demonstrated significantly greater improvements in Brunnstrom scale scores, with higher proportions of patients achieving advanced recovery levels (P = 0.015). FMA and MBI scores showed superior improvements in motor function and daily living abilities in the scalp acupuncture group compared to controls (P < 0.05). Enhanced cerebral blood flow velocities and volumes were observed in the scalp acupuncture group, particularly in the anterior and middle cerebral arteries (P < 0.01). Serum BDNF levels were significantly elevated in the scalp acupuncture group post-treatment, suggesting enhanced neural repair.

Conclusions: This study provides evidence that scalp acupuncture combined with conventional therapy can significantly improve motor function, daily living abilities, and neural recovery markers in patients with hemiplegia following moderate to severe TBI. These findings warrant larger, multicenter trials to evaluate the long-term efficacy of scalp acupuncture and to determine its role as a potential gold standard for hemiplegia treatment in neurological rehabilitation.

Purpose: Scoliosis may create muscle imbalance and disturb muscle metabolism. However, no studies have examined muscle cell metabolism in scoliosis. This study evaluates lactate concentration in female college students with scoliosis.

Methods: One hundred fifty female college students followed this cross-sectional analytic study. Inclusion and exclusion criteria were applied. Scoliosis was measured using a scoliometer. A scoliometer reading of 5° was considered scoliosis. Lactate concentration was measured using a lactate analyzer, and a lactate value above 2 mg dL-1 was denoted as 'elevated.' Anova and post hoc tests were used to analyze differences in the variables between scoliosis and normal subgroups. The results were significant if P < 0.05.

Results: One hundred participants (66.7%) had a spinal curve angle of more than 5°. Only weight in thoracic scoliosis was lower than normal (P = 0.022). Lactate was significantly higher than normal in all scoliosis subtypes (P < 0.001). Lactate in both types was considerably higher than thoracic and lumbar scoliosis (P = 0.04 and 0.03, respectively).

Conclusion: Lactate concentration increased in female students with scoliosis.

Purpose: This study aimed to determine the effects of yoga on the recovery of the cardiac autonomic nervous system and immunosuppression after intense exercise.

Methods: Seven healthy adult men were enrolled in two trials: rest for 30 min in a seated position (CON) and yoga for 30 min (YOG) after a treadmill running for 60 min at 75% V˙ O2max in a randomized crossover design. Natural killer (NK) cell activity, salivary secretory immunoglobulin A (SIgA), cortisol, testosterone, and indicators related to heart rate variability, mood states, and muscle soreness were measured before exercise (Pre), immediately (P0) and 60 min (P1) after rest or yoga, and the following morning (P2).

Results: NK cell activity was significantly decreased in the CON trial (P < 0.05) but not in the YOG trial. The decrease in NK cell activity from Pre at P0, P1, and P2 in the CON trial was significantly larger than that in the YOG trial (P < 0.05). Testosterone secretion rate tended to be higher after yoga than at rest (P = 0.052). The square root of the mean squared difference of successive normal-to-normal intervals (RMSSD) at P0 in the YOG trial was significantly higher than that in the CON trial (P < 0.05). Changes in NK cell activity correlated with changes in RMSSD (r = 0.445, P < 0.05).

Conclusion: This study showed that yoga can alleviate the decline of NK cell activity after intense exercise by enhancing parasympathetic nerve activity, thus suggesting that yoga may be an effective recovery method for athlete conditioning.

Associative learning tests are cognitive assessments that evaluate the ability of individuals to learn and remember relationships between pairs of stimuli. The Rutgers Acquired Equivalence Test (RAET) is an associative learning test that utilizes images (cartoon faces and colored fish) as stimuli. RAET exists in various versions that differ in the degree of the complexity of the stimuli used in the given version. It has been observed that differences in stimulus complexity can lead to marked differences in test performance, but the related cortical functional differences remain to be elucidated. In the present study, we introduce a Machine Learning- and Independent Component Analysis-based EEG signal processing pipeline, which can detect such differences. RAET and its reduced stimulus complexity variant, Polygon was administered to 32 healthy volunteers and EEG recordings were made with a 64-channel system. The most remarkable differences between RAET and Polygon were detected in the frontal regions, which can be connected to decision making. On the other hand, the parietal regions showed the lowest number of differences between RAET and Polygon. Some task-related activity in the temporo-occipital region was identified, which shows different dynamics depending on visual stimulus complexity.