Journal of Strength and Conditioning Research最新文献

{"title":"Concurrent Validity and Interunit Reliability of 25-Hz GNSS Units for Profiling Sprinting Performance.","authors":"Louis Dennison, Grant M Duthie, Fabian Ehrmann, Michael A Psarakis","doi":"10.1519/JSC.0000000000004961","DOIUrl":"10.1519/JSC.0000000000004961","url":null,"abstract":"<p><strong>Abstract: </strong>Dennison, L, Duthie, GM, Ehrmann, F, and Psarakis, MA. Concurrent validity and interunit reliability of 25-Hz GNSS units for profiling sprinting performance. J Strength Cond Res 39(1): 107-114, 2025-Profiling sprint performance by assessing within-race velocity or time is crucial for understanding an athlete's capabilities and identifying areas for improvement. While traditional gold standard systems provide valid and reliable measurements, they are often costly, laboratory-based, or impractical for field-based settings. New Global Navigation Satellite System (GNSS) units (25 Hz) with higher sampling rates may address some of these limitations. The purpose of the project was to evaluate the concurrent validity and interunit reliability of 25-Hz GNSS units by examining their agreement with laser devices and timing gates for velocity measurements and sprint/interval times. Concurrent validity was assessed during a real track and field training session. Thirty subjects each completed 3 to 6 maximal 40-meter sprints, for a total of 106 sprints, while being assessed simultaneously through all systems. Interunit reliability was assessed by placing 3 GNSS units on a motor vehicle and completing 60 accelerations from 0 to 60 m. Low mean bias (<1%) and typical error less than <2% for all measurements demonstrate excellent agreement between GNSS and criterion devices. The units demonstrated good reliability for the 0-10 m interval time (intraclass correlation coefficient [ICC] = 0.86), excellent reliability for all remaining 10 m to 60 m intervals (ICC = 0.91-0.99), sprint times 0-60 m (ICC = 0.97), and maximal sprint velocity (ICC = 1.0). These GNSS units provide an efficient and feasible alternative to traditional measurement devices. For coaches, this technology offers a scalable method to concurrently assess the sprint performances of multiple athletes during training and competitions, enabling evidence-based decisions to guide athletic development.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":"107-114"},"PeriodicalIF":2.5,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reliability and Accuracy of Stryd to Detect Changes in Vertical Displacement of the Center of Mass While Running.","authors":"Matthew Somma, Michael A Lawrence","doi":"10.1519/JSC.0000000000005038","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005038","url":null,"abstract":"<p><strong>Abstract: </strong>Somma, M and Lawrence, MA. Reliability and accuracy of Stryd to detect changes in vertical displacement of the center of mass while running. J Strength Cond Res XX(X): 000-000, 2024-The purpose of this study was to determine if Stryd can reliably and accurately detect changes in vertical displacement of the center of mass (VCoM) that are produced when cadence was increased by 5 and 10%. A secondary purpose of this investigation was to determine the interlimb reliability of Stryd for VCoM and cadence. Twenty healthy individuals (5 males, 15 females; age: 24.5 ± 1.5 years; mass: 67.1 ± 12.2 kg; height: 1.66 ± 0.01 m) were fitted for motion capture and 2 Stryd devices. After warm-up, subjects ran at a self-selected speed on the treadmill for each condition (self-selected, +5%, and +10% cadence) while VCoM and cadence were collected simultaneously from Stryd and motion capture. Reliability between the Stryd devices on different limbs was excellent for both cadence (intraclass correlation coefficient [ICC] = 0.999, p < 0.001) and VCoM (ICC = 0.993, p < 0.001). Cadence was not significantly different between the Stryd device and motion capture (p = 0.153). Stryd produced significantly (p < 0.001) smaller values for VCoM regardless of condition, with average differences ranging between 4.4 and 4.6 cm. A linear regression revealed that Stryd predicted 50.7% of variation in motion capture VCoM (p < 0.001). Stryd can reliably measure both cadence and VCoM regardless of which limb it is placed on, as indicated by the near-perfect agreement between Stryd devices, and the Stryd device can detect and predict changes in VCoM. However, Stryd consistently underestimates VCoM, which can be corrected by using a linear regression equation.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scenario and Shooting Performance in Incumbent Deputy Sheriffs/Police Officers, Cadets, and Cadets Who Worked in Custody/Corrections Facilities.","authors":"Robert G Lockie, Michael A Young, Sarah N Lanham, Robin M Orr, J Jay Dawes, Thomas R Nagel","doi":"10.1519/JSC.0000000000005058","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005058","url":null,"abstract":"<p><strong>Abstract: </strong>Lockie, RG, Young, MA, Lanham, SN, Orr, RM, Dawes, JJ, and Nagel, TR. Scenario and shooting performance in incumbent deputy sheriffs/police officers, cadets, and cadets who worked in custody/corrections facilities. J Strength Cond Res XX(X): 000-000, 2024-Job-specific fitness of law enforcement personnel can decline during their careers. Personnel could offset fitness deficiencies with greater skill and knowledge. Cadets in certain counties may work in custody/corrections before their training academy. This study used archival data to compare job-specific scenario performance of incumbent deputy sheriffs/police officers (INC; n = 15), cadets entering academy (CAD; n = 19), and cadets entering academy after working in custody/corrections facilities (CADCUST; n = 25). Subjects completed a scenario (step-ups, jumping jacks, sprawls, strikes, drags, sandbag carries, and a simulated fight) as fast as possible followed by a firearms test where they had to hit 6 steel plates. Steel time (time to hit all plates) and number of shots required were recorded. Univariate analysis of covariances, with sex and age as covariates and Bonferroni post hoc analyses, derived between-group differences in all variables (p < 0.05). The CAD group completed the scenario faster than the INC group (p = 0.011). Though not significant, the INC group did have the fastest steel time and lowest number of shots. The CADCUST group completed the scenario 10% slower than the CAD group, was 138-366% slower in steel time, and needed 61-100% more shots than the other groups. The INC group likely had fitness limitations that affected scenario performance but demonstrated better shooting skills. The CADCUST group was slower than the CAD group in the scenario and performed worst in the shooting test. Cadets who work in custody/corrections facilities before academy may require fitness and skill interventions while INC should attempt to maintain their fitness during their career.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acute Responses to Different Lifting Velocities During Squat Training With and Without Blood Flow Restriction.","authors":"Pedro Jesús Cornejo-Daza, Juan Sánchez-Valdepeñas, Jose Páez-Maldonado, Luis Rodiles-Guerrero, Miguel Sánchez-Moreno, Gonzálo Gómez-Guerrero, Juan A León-Prados, Fernando Pareja-Blanco","doi":"10.1519/JSC.0000000000005021","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005021","url":null,"abstract":"<p><strong>Abstract: </strong>Cornejo-Daza, PJ, Sánchez-Valdepeñas, J, Páez-Maldonado, J, Rodiles-Guerrero, L, Sánchez-Moreno, M, Gómez-Guerrero, G, León-Prados, JA, and Pareja-Blanco, F. Acute responses to different lifting velocities during squat training with and without blood flow restriction. J Strength Cond Res XX(X): 000-000, 2024-The aims of the research were to compare the acute mechanical, metabolic, neuromuscular, and muscle mechanical responses to different lifting velocities (maximal vs. half-maximal) under distinct blood flow conditions (free [FF] vs. restricted [BFR]) in full-squat (SQ). Twenty resistance-trained males performed 4 protocols that differed in the velocity at which loads were lifted (MaxV: maximal velocity vs. HalfV: half-maximal velocity) and in the blood flow condition (FF: free-flow vs. BFR: 50% of arterial occlusion pressure). The relative intensity (60% 1 repetition maximum), volume (3 sets of 8 repetitions), and resting time (2 minutes) were matched between protocols. Mean propulsive force (MPF), mean propulsive velocity (MPV), mean propulsive power (MPP), and electromyography (EMG) values were recorded for each repetition. Tensiomyography (TMG), blood lactate, countermovement jump (CMJ), maximal voluntary isometric contraction in 90° SQ, and performance with the load that elicited a 1-m·s-1 velocity at baseline measurements (V1-load) in SQ were assessed at pre-exercise and postexercise. The MaxV protocols showed significantly greater MPF, MPV, MPP, and EMG amplitude during the exercise than the HalfV protocols (velocity effect, p < 0.05). The FF protocols achieved higher MPF and MPP during exercise than BFR (BFR effect, p < 0.05). The BFR protocols induced greater blood lactate after exercise (BFR × time interaction, p = 0.02), along with higher postexercise impairments in mechanical performance (BFR × time interaction, p < 0.05). The MaxV protocols elicited superior performance and greater muscle activation during exercise. The BFR protocols resulted in lower force and power production during exercise and exhibited higher performance impairments and increased metabolic stress postexercise.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of Congested Match Schedules on Countermovement Jump Metrics in Elite Volleyball Players.","authors":"André Rebelo, Irineu Loturco, João Rafael Pereira, Diogo Vicente Martinho, João Valente-Dos-Santos, Gert Vande Broek","doi":"10.1519/JSC.0000000000005031","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005031","url":null,"abstract":"<p><strong>Abstract: </strong>Rebelo, A, Loturco, I, Pereira, JR, Martinho, DV, Valente-dos-Santos, J, and Broek, GV. Impact of congested match schedules on countermovement jump metrics in elite volleyball players. J Strength Cond Res XX(X): 000-000, 2024-The aim of this study was to assess the impact of a congested match schedule on various countermovement jump (CMJ) metrics recorded across the braking, transfer, propulsive, and flight phases of the CMJ. Fourteen male elite volleyball players were monitored across 7 microcycles, with CMJ assessments conducted at 14 time points using portable force plates. Repeated measures analysis of variance with Bonferroni post hoc tests and coefficient of variation (CV) analysis were used to analyze the data. The CVs for all metrics indicated a moderate variability between microcycles and low variability between the beginning and end of the weeks. Significant variability was observed in key performance metrics, including peak propulsive power (p < 0.001, partial eta squared [ηp2] = 0.336), peak propulsive velocity (p = 0.005, ηp2 = 0.207), propulsive phase duration (p = 0.008, ηp2 = 0.197), and jump momentum (p = 0.019, ηp2 = 0.225), across microcycles. These findings indicate that these CMJ metrics may be used as sensitive indicators of fatigue and performance changes during intense training and competitive periods. The total score of athleticism, calculated by averaging a set of standardized scores from multiple tests or repeated measures of the same test, for the propulsive and flight phases, proved to be particularly useful in providing a comprehensive view of the neuromuscular status. This emphasizes the importance of recording and analyzing a range of CMJ metrics to optimize training and recovery strategies in elite volleyball players.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mobile Anthropometry in Division I Baseball Athletes: Evaluation of an Existing Application and the Development of New Equations.","authors":"Hunter Haynes, Grant M Tinsley, Sydney H Swafford, Abby T Compton, Juliana Moore, Paul T Donahue, Austin J Graybeal","doi":"10.1519/JSC.0000000000005039","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005039","url":null,"abstract":"<p><strong>Abstract: </strong>Haynes, H, Tinsley, GM, Swafford, SH, Compton, AT, Moore, J, Donahue, PT, and Graybeal, AJ. Mobile anthropometry in Division I baseball athletes: evaluation of an existing application and the development of new equations. J Strength Cond Res XX(X): 000-000, 2024-The purpose of this study was to evaluate the agreement between mobile application and dual-energy x-ray absorptiometry (DXA)-derived body composition parameters in a group of Division I (DI) collegiate baseball athletes and to develop new equations for this population using this mobile technique. A total of 41 (age: 20.5 ± 1.5 years; DXA %fat: 18.9 ± 4.6%) DI collegiate baseball athletes underwent body composition assessments using DXA and a mobile anthropometric application. Total and appendicular body composition estimates were produced from this mobile application using previously developed equations and evaluated against the reference (DXA) in the complete sample of athletes. Least absolute shrinkage and selection operator regressions were then used to develop new equations using the mobile application in a portion of the athletes (n = 34) and subsequently tested in the remaining athletes (n = 7). In the complete sample, no body composition estimate using the mobile application's existing equations (R2: 0.00-0.68) demonstrated equivalence with DXA, including estimates of %fat (R2: 0.37; root-mean-squared error [RMSE]: 3.74%), fat mass (FM), and total (appendicular lean mass [ALM]) and leg lean mass ([ALMlegs] R2: 0.67-0.68; RMSE: 3.43-4.86 kg). In the testing sample, estimates produced from the newly developed equations demonstrated acceptable performance when compared to DXA, most notably %fat (R2: 0.80; RMSE: 3.66%), FM, ALM, and ALMlegs (R2: 0.55-0.87; RMSE: 0.74-3.46 kg). Previously developed equations using mobile anthropometrics may not demonstrate acceptable agreement with DXA in DI collegiate baseball athletes, and newly developed equations specific to this group may be more suitable. Those employing these newly developed equations should use caution until further external cross-validation is performed.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Polarized Training vs. Other Training Intensity Distribution Models on Physiological Variables and Endurance Performance in Different-Level Endurance Athletes: A Scoping Review.","authors":"Tomás Rivera-Köfler, Adrián Varela-Sanz, Alexis Padrón-Cabo, Manuel A Giráldez-García, Iker Muñoz-Pérez","doi":"10.1519/JSC.0000000000005033","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005033","url":null,"abstract":"<p><strong>Abstract: </strong>Rivera-Köfler, T, Varela-Sanz, A, Padrón-Cabo, A, Giráldez-García, MA, and Muñoz-Pérez, I. Effects of polarized training vs. other training intensity distribution models on physiological variables and endurance performance in different-level endurance athletes: a scoping review. J Strength Cond Res XX(X): 000-000, 2024-This scoping review aimed to analyze the long-term effects of polarized training (POL) on key endurance physiological- and performance-related variables and to systematically compare them with other training intensity distribution (TID) models in endurance athletes of different performance levels. Four TID models were analyzed: POL, pyramidal (PYR), threshold (THR), and block (BT) training models. The literature search was performed using PubMed, SportDiscus, Scopus, and Web of Science databases. Studies were selected if they met the following criteria: compared POL with any other TID model, included healthy endurance athletes, men, and/or women; reported enough information regarding the volume distribution in the different training intensity zones (i.e., zone 1, zone 2, and zone 3), assessed physiological (i.e., maximum/peak oxygen uptake, speed or power at aerobic and anaerobic thresholds, economy of movement), and performance in competition or time-trial variables. Of the 620 studies identified, 15 met the eligibility criteria and were included in this review. According to scientific evidence, POL and PYR models reported greater maximum oxygen uptake enhancements. Both POL and PYR models improved the speed or power associated with the aerobic threshold. By contrast, all TID models effectively improved the speed or power associated with the anaerobic threshold. Further research is needed to establish the effects of TID models on the economy of movement. All TID models were effective in enhancing competitive endurance performance, but testing protocols were quite heterogeneous. The POL and PYR models seem to be more effective in elite and world-class athletes, whereas there were no differences between TID models in lower-level athletes.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differences in Anthropometric Parameters, Physical Fitness, and Kicking Speed in Young Football Players According to Performance Level, Playing Position, and Relative Age Effect: A Population-Based Study.","authors":"Hjalti R Oddsson, Katrín Ý Friðgeirsdóttir, Lára Hafliðadóttir, Ingi Þ Einarsson, Hafrún Kristjánsdóttir, Jose M Saavedra","doi":"10.1519/JSC.0000000000005041","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005041","url":null,"abstract":"<p><strong>Abstract: </strong>Oddsson, HR, Friðgeirsdóttir, KÝ, Hafliðadóttir, L, Einarsson, IÞ, Kristjánsdóttir, H, and Saavedra, JM. Differences in anthropometric parameters, physical fitness, and kicking speed in young football players according to performance level, playing position, and relative age effect: a population-based study. J Strength Cond Res XX(X): 000-000, 2024-The objectives of this study were to determine (a) the differences, both in male and female players, in anthropometric parameters, physical fitness, and kicking speed based on the players' level and position on the field; (b) whether there is a relative age effect based on the players' level, and (c) whether there is a relationship between the relative age effect and the anthropometric parameters, physical fitness, and kicking speed parameters. Eight hundred twenty-six football players (15.76 ± 2.60 year old, 75.7% male) participated in the study. Players were grouped into elite and nonelite, as well as based on their field position and birth quartile. Nonparametric tests were used to study differences by level and by position or trimesters. Chi-square goodness of fit analysis was performed to know the association between elite and nonelite players regarding the relative age effect. Physical fitness parameters and kicking speed were higher in elite players than in nonelite players (5.834 ≥χ2 ≤ 48.079; p < 0.001). There were differences in anthropometric and physical fitness parameters and kicking speed depending on the player's position: goalkeeper vs. outfield players (7.648 ≥χ2 ≤ 26.078; p < 0.001) except in jump tests. There was a relative age effect in elite male players (χ2 = 26.313; p < 0.001) but not in female players, and it was related to anthropometric and physical fitness parameters. This population-based study offers insights into the variables that differentiate elite from nonelite players at young ages, with differences in the relative age effect between male and female players, which can be used by coaches to identify key performance variables.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How Do They Decide? Performance Support Staff Perceptions of Decision-Making in Elite-Sport Environments.","authors":"Patrick J Wilson, Gregory Roe, John Kiely","doi":"10.1519/JSC.0000000000004989","DOIUrl":"https://doi.org/10.1519/JSC.0000000000004989","url":null,"abstract":"<p><strong>Abstract: </strong>Wilson, PJ, Roe, G, and Kiely, J. How do they decide? Performance support staff perceptions of decision-making in elite-sport environments. J Strength Cond Res XX(X): 000-000, 2024-Decision-making is a critical component of performance support staff responsibilities, yet research exploring staff perceptions relating to key facets of decision-making is lacking. This study aimed to explore perceptions of performance support staff relating to; the importance of decision-making in their role, the value of team decision-making, strategies to enhance decision-making skills, monitoring the process and outcome of decisions, and the obstacles to good decision-making within their professional contexts. A mixed-methods approached was used to explore perceptions of decision-making in 191 performance support staff (male staff = 179, female staff = 12) working in professional (n = 147) or international (n = 44) sport. Performance support staff reported decision-making as extremely important to their role; however, only 31% had received formal decision-making education and revealed underdeveloped decision-making capabilities within their organizations as a barrier to good decision-making. Most performance support staff conveyed that team decision-making is a valuable endeavor and augments decision outcomes; yet articulated dysfunctional team dynamics as an obstacle to good decision-making in their environments. Largely, performance support staff reported an absence of organizational strategy and workflow systems and processes for tracking and making decisions, respectively, whereas only 22% had a consistent reviewing and updating process. When making decisions, performance support staff faced several different cognitive biases and were challenged by the environmental pressures. The perspectives documented here suggest that performance support staff would likely benefit from undertaking evidence-based training and implementing scientifically informed strategies to enhance decision-making processes within their organizations.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142877327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Associations of Handgrip Strength, Walking Pace, and Genetic Risks With Incident Arrhythmias.","authors":"Panpan He, Ziliang Ye, Mengyi Liu, Yuanyuan Zhang, Chun Zhou, Yanjun Zhang, Sisi Yang, Xianhui Qin","doi":"10.1519/JSC.0000000000005036","DOIUrl":"https://doi.org/10.1519/JSC.0000000000005036","url":null,"abstract":"<p><strong>Abstract: </strong>He, P, Ye, Z, Liu, M, Zhang, Y, Zhou, C, Zhang, Y, Yang, S, and Qin, X. Associations of handgrip strength, walking pace, and genetic risks with incident arrhythmias. J Strength Cond Res XX(X): 000-000, 2024-We quantified the associations of handgrip strength and walking pace with incident arrhythmias using Cox proportional hazards models with hazards ratios (HRs). The study included 487,673 subjects, with an average age of 56.4 years, 54.8% female, and free of baseline arrhythmias from the UK Biobank prospective study. Handgrip strength was assessed by a dynamometer. Low handgrip strength was defined as less than 27 kg in men and 16 kg in women. Walking pace was self-reported as slow, average, or brisk. The arrhythmia categories involved incident atrial fibrillation (AF), incident ventricular arrhythmias, and incident bradyarrhythmia, respectively. Over a median follow-up duration of 12.4 years, 28,967 (5.9%), 4,061 (0.8%), and 11,741 (2.4%) subjects developed incident AF, incident ventricular arrhythmias, and incident bradyarrhythmia, respectively. Compared with those with low handgrip strength, the adjusted HRs (95% confidence interval [CI]) of incident AF, ventricular arrhythmias, and bradyarrhythmia in subjects with normal handgrip strength were 0.76 (95% CI: 0.73.-0.79), 0.75 (95% CI: 0.67.-0.84), and 0.80 (95% CI: 0.74.-0.85), respectively. Compared with those with a slow walking pace, subjects with a brisk walking pace had significantly lower risks of incident AF (HR, 0.56; 95% CI: 0.53.-0.58), ventricular arrhythmias (HR, 0.52; 95% CI: 0.45.-0.59), and bradyarrhythmia (HR, 0.63; 95% CI: 0.59.-0.68). In addition, the inverse associations of handgrip strength and walking pace with AF were significantly stronger among those with a lower genetic risk of AF (both p interaction <0.001). In conclusion, handgrip strength and walking pace were inversely associated with incident arrhythmias. The inverse associations for incident AF were stronger in those with a lower genetic risk of AF.</p>","PeriodicalId":17129,"journal":{"name":"Journal of Strength and Conditioning Research","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142869436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}