Journal of Functional Morphology and Kinesiology最新文献

Background: Resistance training has recently focused more on a high- vs. low-load training approach, suggesting heavier loads optimize strength adaptations through maximal recruitment of motor units, whereas lower loads stimulate a greater hypertrophy response. The purpose of this investigation was to examine and determine significant differences in muscle thickness, strength, and hormonal markers over nine weeks of high- or low-load resistance training. Methods: Seventeen recreationally-trained males were recruited for this study (M_age = 20.4 ± 2.7 years). Participants were split into training with high-loads (85% 1-RM; n = 8) or low-loads (30% 1-RM; n = 9) completing 3 whole-body training sessions per week for 9 weeks. Each session included three working sets per exercise of repetitions to failure. Measures were collected at baseline and every three weeks after of muscle thickness (biceps brachii, triceps brachii, pectoral major, rectus femoris, and biceps femoris) and salivary hormones (basal and acute post-exercise testosterone and cortisol). RM-ANOVAs were conducted to analyze changes in hypertrophy and the hormones, with significance set at p < 0.05. Results: Muscle thickness increased significantly over time for all sites (p < 0.05), with no significant group × time interactions except for the triceps brachii (p = 0.04). There were no significant changes in basal hormone levels or changes from basal to immediately post exercise (p > 0.059). The high-load group showed greater increases in 1-RM following the training program. Conclusions: Our results demonstrate similar hypertrophy regardless of training volume and training load, but greater increases in strength in the high-load group. Hormonal data revealed no significant changes in basal cortisol and testosterone, suggesting similar stress and recovery. While nonsignificant for differences pre-post in either marker, the pattern of a slight decrease in testosterone may be an effect of receptor uptake, and additional monitoring over a longer time interval should be used to track the changes over a full recovery window.

Fishing is a widely practiced recreational activity that offers psychological, physical, and social benefits, but it also poses risks such as acute trauma and chronic overuse injuries. This narrative review aims to (1) synthesize current evidence on the musculoskeletal disorders, psychological outcomes, and environmental factors associated with recreational and sport fishing; (2) identify the physical, mental, and social health benefits reported across different angling disciplines; (3) characterize acute and chronic injury risks, including overuse syndromes and environment-related hazards; and (4) highlight gaps in the literature to guide future research directions in public health, rehabilitation, and preventive medicine. Materials and Methods: A narrative review was conducted in accordance with SANRA guidelines. A structured search of PubMed, Scopus, Web of Science and Google Scholar identified studies published between 2000 and 2025. Eligible sources included population surveys, clinical studies, therapeutic angling programs, epidemiological reports, and case studies addressing physical, psychological, or injury-related outcomes in recreational or sport fishing. Studies on commercial or occupational fishing were excluded. Evidence was synthesized thematically across benefit and risk domains. A total of 565 records were identified across four databases (PubMed, Scopus, Web of Science, Google Scholar). After screening, duplication, and full-text assessment, 41 studies met the eligibility criteria and were included in the narrative synthesis. The evidence indicates significant psychological benefits of fishing, including reductions in stress, improved mood, and clinically meaningful decreases in Post-Traumatic Stress Disorder (PTSD) symptoms reported in therapeutic fly-fishing programs. Musculoskeletal outcomes were more heterogeneous: chronic conditions such as low back pain and repetitive strain injuries of the shoulder, elbow, and wrist were commonly reported among regular anglers, particularly in physically demanding disciplines. Ice and sea fishing were associated with distinct environmental risks, including hypothermia, frostbite, and rare but documented fatal incidents. The results of this narrative review highlight the therapeutic potential of both recreational and sport fishing. However, they also point to the need for greater awareness of the risk of injury and environmental hazards associated with this type of fishing.

Lead climbing and bouldering have witnessed a surge in popularity, particularly highlighted by their inclusion in prestigious events like the 2020 Summer Olympic Games in Tokyo. This systematic review aims to comprehensively assess existing literature on injury risk factors and prevention programs specific to these disciplines. We systematically searched PubMed, Web of Science, and SPORTDiscus up to November 2023. Methodological quality was appraised using the Joanna Briggs Institute (JBI) critical appraisal tools. Data synthesis involved qualitative analysis. Of 463 screened records, 7 studies were included, encompassing data from over 4000 climbers. The literature consistently indicates that overuse injuries-particularly to the fingers and shoulders-are more prevalent than acute injuries in adult population. However, evidence for specific risk factors is inconclusive and contradictory. Reported associations for higher skill level, age, and use of preventive measures (e.g., taping) were inconsistent across studies. Further research employing rigorous methodologies and long-term follow-up is warranted to elucidate injury mechanisms in lead climbing and bouldering. These investigations are crucial for informing clinical practice and developing sport-specific injury prevention strategies aimed at ensuring the safety and well-being of athletes in these disciplines. Future studies should focus on standardizing injury definitions and assessment methods and explore targeted preventive measures to address the unique risks associated with these sports.

Objectives: Shoulder joint strength and muscle activation during overhead reaching are critical for ergonomic task design, rehabilitation, and exoskeleton support. The objective of this study was to characterize maximum shoulder torque and flexor muscle activation profiles across functional elevation angles in healthy adult males. Methods: A total of 14 healthy male participants performed maximum voluntary isometric contractions at eight arm elevation angles (90-160°, sagittal plane, and standing). Shoulder torque was measured using a calibrated force sensor and normalized to each participant's overall maximum. Electromyography (EMG) was recorded from the anterior deltoid, medial deltoid, biceps brachii, and clavicular pectoralis major; EMG for the medial deltoid, biceps brachii, and pectoralis major was normalized to muscle-specific isometric MVCs, whereas the anterior deltoid was normalized to the peak value at 90° during the main task. All EMG signals were smoothed using a 0.5 s RMS-based moving average window. Linear regression was used to analyze the torque-angle relationship, and linear mixed-effects models were used to test EMG differences across angles. Summary statistics included mean ± SD, coefficient of variation, R², p-values (significance threshold: p < 0.05), Cohen's d, and 95% confidence intervals where appropriate. Results: Maximum torque declined with elevation angle (y = -0.6317x + 157.21; R² = 0.99), from 77.2 Nm at 90° to 43.2 Nm at 160°, with normalized values from 99.6% to 55.3%. Medial deltoid activation increased significantly with elevation (p < 0.001, from 87.5 ± 19.9% at 90° to 109.4 ± 25.6% at 150°), while pectoralis major declined sharply (p < 0.001, from 68.9 ± 24.2% at 90° to 19.8 ± 5.6% at 160°). Anterior deltoid and biceps brachii activations were high and showed no systematic change with angle (p = 0.37 and 0.81, respectively), remaining within approximately 95-102% and 70-85% of their reference levels across 90-160°. Normalization reduced inter-participant variability, clarifying muscle-specific trends. Conclusions: This study provides preliminary biomechanical reference values for shoulder torque and muscle activation across elevation angles in healthy males under isometric standing conditions, confirming an inverse torque-angle relationship and distinct muscle activation strategies at higher positions. These findings may inform ergonomic assessment and exoskeleton design, while recognizing that generalization to dynamic tasks and other populations requires caution.

Background: Chronic low back pain (CLBP) is a common musculoskeletal disorder among middle-aged women, often leading to impaired dynamic balance and increased fear of movement. This study aimed to investigate the effects of dynamic stability training using the inertial load of water on balance ability and pain in middle-aged women with CLBP. Methods: Twenty-nine participants aged 40-65 years with CLBP were randomly assigned to an experimental or control group. The experimental group wore a water-filled aquavest, and the control group wore a weighted vest. Both groups performed 12 weeks of dynamic stability training twice per week. Outcome measures included the Y-Balance Test and Center of Pressure parameters, Visual Analogue Scale and Tampa Scale for Kinesiophobia. Data were analyzed using mixed-design two-way repeated-measures (between-within) analysis of variance to examine time, group, and interaction effects. Results: A significant group × time interaction effect was found in Y-Balance Test reach distances of the non-dominant leg, with the aquavest group showing greater improvements compared to the control group (p < 0.05). Center of Pressure analysis revealed decreased non-dominant leg Anterior-Posterior Root Mean Square in the aquavest group, indicating enhanced postural stability. Both groups showed decreased VAS and TSK. Conclusions: Dynamic stability training using inertial load of water effectively improved both quantitative and qualitative aspects of dynamic balance in middle-aged women with CLBP and can serve as a functional intervention for neuromuscular rehabilitation.

Background: Chronic pain conditions such as fibromyalgia syndrome (FMS) reflect maladaptive network physiology across perceptual-autonomic-immune axes, yet most treatments remain symptomatic and incompletely effective. Methods: We conducted a comprehensive systematic review to evaluate vagus nerve stimulation (VNS) and FMS within a network physiology framework. PubMed, Embase, and Cochrane CENTRAL were searched on October 24, 2025. Risk of bias was assessed using the ROB-2 tool. An iterative thematic synthesis was performed to develop an integrative conceptual framework and to identify knowledge gaps and future research directions. Results: We first summarize physiological evidence showing autonomic imbalance (e.g., decreased heart rate variability), neuroinflammatory activation, and aberrant cortical network connectivity in FMS, supporting a network-dysregulation model. We then included 6 studies (4 clinical studies and 2 protocols) on VNS effects, highlighting improvements in pain, fatigue, sleep disturbance and autonomic regulation, along with emerging mechanistic insights. Key methodological heterogeneity-such as stimulation parameters, outcome metrics, type of control arm, sham definition, and small samples-limits current interpretability. Finally, we outline a research agenda centered on network-based biomarkers, immunophenotyping, adaptive trial designs and stratification of responders, with the aim of validating taVNS as a scalable neuromodulatory intervention for FMS. Conclusions: By reframing FMS from a symptom-centric pharmacologic model to a network-centric neuromodulation approach, taVNS is a promising tool for mechanism-based therapeutics in central sensitization syndromes and chronic pain.

Background. This study aimed to quantify differences in the internal training load (ITL) of an elite rink hockey (RH) team across days within and between three types of microcycles: pre-season, in-season regular, and in-season congested, to provide insights to optimise microcycle scheduling. Methods. One international-level male RH team comprising seven outfielders (29.6 ± 4.7 years; height, 178.9 ± 2.3 cm; body mass, 77.8 ± 5.7 kg) and one goalkeeper (32 years; height, 180.4 cm; body mass, 83.6 kg) was monitored for 21 microcycles. The ITL was assessed using the session rate of perceived exertion (sRPE) and quantified as time based on a triphasic classification commonly utilised in team sports: low-intensity training (LIT, <80% heart rate maximum (HRmax)), medium-intensity training (MIT, 80-90% HRmax), and high-intensity training (HIT, >90% HRmax). Generalized estimating equations were used to examine differences across within-microcycle training days and between seasonal phases, with linear mixed models applied as sensitivity analyses. Results. Across all phases, significant day-to-day variations in ITL were observed within microcycles (all p < 0.001), with both subjective (sRPE) and objective (LIT-HIT) ITLs progressively decreasing as match days (MDs) approached, showing moderate-to-large population-averaged effects with 95% confidence intervals consistently not crossing zero. The pre-season exhibited the highest overall ITL (p < 0.001), characterised by a substantially greater sRPE and increased time spent across all intensity zones, with the largest magnitudes observed for LIT and MIT compared with the in-season phases. Conclusions. Findings suggest that an international-level RH team progressively reduced the ITL as MDs approached with the highest loads scheduled earlier within microcycles. Moreover, the pre-season had the highest ITLs. This ITL distribution may provide useful guidance for RH coaches and support staff in optimising microcycle planning.

Background: Body physique refers to body size, structure, and composition. PS is used to describe the profile of athletes in different sports. Aims: To determine body physique and body fat percentage in elite athletes using the Hattori chart and to identify the elite zone. Methods: Scoping review. The search was performed in PubMed, Google Scholar, Ovid Books, CAB eBooks, Clarivate InCites, MyiLibrary, Web of Science, Taylor & Francis Online, Core Collection, and Scopus. The search strategy was "body physique" OR "anthropometric" OR "body composition" AND "elite athlete" OR "athlete" OR "elite". Results: Using indirect methods, elite athletes showed intermediate solid body physique (male) and lean intermediate body physique (female), and 13.6% ± 3.6% (male) and 22.3% ± 2.8 (female) body fat. Using doubly indirect methods, elite athletes showed lean intermediate body physique (male), and intermediate body physique (female), and a percentage of body fat of 13.7% ± 5.2% (male) and of 21.7% ± 4.3% (female) of body fat. Conclusions: Hattori's chart facilitates the visualization of changes in body mass index, fat-free mass index, fat mass index, and percentage of body fat, helping personalize training, monitor composition changes, and guide nutrition programs to optimize performance and health.

Objective: The aim of this study was to analyse the evolution of heart rate variability (HRV) during official competition in high-level amateur padel players according to match outcome. Methods: HRV was measured in 44 individual recordings obtained across 11 matches involving 12 padel players. Measurements were taken before the match (PRE), during three sets (S1, S2 and S3) and during the two rest periods between sets (R1 and R2). Time-domain variables analysed included mean R-R interval (Mean RR), standard deviation of normalised R-R intervals (SDNN), root mean square of successive differences (RMSSD), natural logarithm of RMSSD (LnRMSSD) and standard deviation of heart rate (STD HR), while nonlinear variables included the transverse (SD1) and longitudinal (SD2) axes of the Poincare plot, stress score (SS) and the sympathetic-parasympathetic ratio (SNS/PNS ratio). Results: Significant fluctuations in HRV were observed throughout the match. Players who won exhibited significantly higher values of Mean RR, SDNN, RMSSD, LnRMSSD, SD1 and SD2 during S1 (p < 0.05), and higher Mean RR, RMSSD, LnRMSSD and SD1 during R1 (p < 0.01). These differences diminished as the match progressed, disappearing in the later phases (S3, R2). Temporal analysis revealed that both groups showed parasympathetic recovery during the rest periods. Conclusions: This study provides novel evidence on the temporal dynamics of autonomic regulation in padel, showing that match outcome is associated with differences in cardiovascular regulation during the initial phases of competition. These findings support the usefulness of HRV monitoring for performance management in real competition settings.

Balance is referred to as a state of equilibrium where forces of agonist and antagonistic muscles are equal. This is particularly relevant in the practice of Goju-Ryu Karate-Do, a martial art style with combinations of hard and soft techniques. Particularly, karate stances not only depend on technical aspects but also on the ability to achieve a centered posture. In this narrative review, we aim to integrate the existing knowledge about alignment parameters of the spine to various stances in Goju-Ryu Karate-Do to improve biomechanical understanding, allow technical modifications, and consequently enhance positive training experience. Balance is constantly challenged during the interplay of accelerated movements and subsequent controlled postures (Japanese: "Kamae"). This requires continuous neuromuscular coordination to maintain the body's equilibrium. In particular, the body's center of gravity, which is located around the second sacral vertebra in a standing position, needs to be kept within Dubousset's "efficiency cone" for low energy consumption and minimal fatigue. This state is primarily maintained by aligning the spine, the pelvis, and the lower extremities, which is a result of complex biomechanical interactions of various spinopelvic parameters. Applying these concepts of Dubousset to stances in Goju-Ryu Karate-Do helps to explain why during the aging process or natural degeneration, technical modifications are needed to guarantee an optimal training experience in senior or disabled practitioners of Karate-Do. Biomechanical parameters of the spinopelvic axis are crucial in mastering the art of Goju-Ryu Karate-Do. Only with a balanced stance and an optimally situated center of gravity, a block or attack may be successful and movement strategies effective. However, technical modifications of stances must be considered in aged or disabled karateka to allow a sustained training experience.