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Article ; Online: Intentionally Slow Concentric Velocity Resistance Exercise and Strength Adaptations: A Meta-Analysis.

Hermes, Matthew J / Fry, Andrew C

Journal of strength and conditioning research

2023 Volume 37, Issue 8, Page(s) e470–e484

Abstract: Abstract: Hermes, MJ and Fry, AC. Intentionally slow concentric velocity resistance exercise and ...

Abstract	Abstract: Hermes, MJ and Fry, AC. Intentionally slow concentric velocity resistance exercise and strength adaptations: a meta-analysis. J Strength Cond Res 37(8): e470-e484, 2023-Intentionally slow-velocity resistance exercise (ISVRE) is suggested by some to be equally or more effective than fast or traditional velocities for increasing muscular strength. The purpose of this meta-analysis was to assess the effect ISVRE has on strength adaptations compared with faster or traditional velocities, with subgroup analyses exploring age, sex, and training status as confounding factors on the influence of velocity on strength adaptation. Eligible studies (n = 24) were required to be chronic (multiple weeks) randomized or nonrandomized comparative studies using dynamic constant external resistance for training and testing, and pre-post strength assessments. All studies examined healthy individuals (n = 625; fast or traditional n = 306, intentionally slow n = 319). A random-effects meta-analysis indicated a significant (p ≤ 0.05) effect in favor of fast training (effect size [ES] = 0.21, 95% confidence interval [CI] = 0.02-0.41, p = 0.03). Publication bias was noted through trim and fill analysis, with an adjusted effect size estimate of 0.32 (p < 0.001). Subgroup analyses indicated no difference between trained and untrained subjects (QM = 0.01, p = 0.93), and no difference between older and younger subgroups (QM = 0.09, p = 0.77), despite younger favoring faster (ES = 0.23, p = 0.049) and older not favoring either velocity (ES = 0.16, p = 0.46). Subgroup analysis also indicated women favored faster training (ES = 0.95, p < 0.001) in comparison to men (ES = 0.08, p = 0.58). Contrary to some previous reviews, these results indicate that chronic fast or traditional velocity resistance exercise increases muscular strength to a greater degree than ISVRE training. Resistance training velocity must be considered if strength is a desired outcome.
MeSH term(s)	Male ; Humans ; Female ; Muscle, Skeletal ; Resistance Training/methods ; Muscle Strength ; Adaptation, Physiological ; Acclimatization
Language	English
Publishing date	2023-05-18
Publishing country	United States
Document type	Meta-Analysis ; Journal Article
ZDB-ID	1156349-7
ISSN	1533-4287 ; 1064-8011
ISSN (online)	1533-4287
ISSN	1064-8011
DOI	10.1519/JSC.0000000000004490
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Article ; Online: Starters vs. non-starters differences in vertical jump force-time metrics in female professional volleyball players.

Cabarkapa, Damjana V / Cabarkapa, Dimitrije / Fry, Andrew C

Frontiers in sports and active living

2024 Volume 6, Page(s) 1389001

Abstract: As one of the fundamental volleyball skills, countermovement vertical jump (CMJ) has been commonly implemented in the applied sports setting as a non-invasive and time-efficient assessment of athletes' lower-body neuromuscular function. The purpose of ... ...

Abstract	As one of the fundamental volleyball skills, countermovement vertical jump (CMJ) has been commonly implemented in the applied sports setting as a non-invasive and time-efficient assessment of athletes' lower-body neuromuscular function. The purpose of the present study was to examine the differences in CMJ characteristics between starters and non-starters within a cohort of professional female volleyball players. Nineteen athletes competing in one of the top European leagues (i.e., SuperLeague) volunteered to participate in the present investigation. Following the completion of a warm-up protocol, each athlete performed three maximal-effort CMJs with no arm swing while standing on a uni-axial force plate system sampling at 1,000 Hz. The following force-time metrics were used for performance analysis purposes: braking phase duration and impulse, eccentric and concentric duration, mean and peak force and power, contraction time, jump height, and reactive strength index-modified. Mann-Whitney
Language	English
Publishing date	2024-03-25
Publishing country	Switzerland
Document type	Journal Article
ISSN	2624-9367
ISSN (online)	2624-9367
DOI	10.3389/fspor.2024.1389001
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Article ; Online: Dose-Response Relationship for External Workload and Neuromsuclar Performance Over a Female, Collegiate, Basketball Season.

Philipp, Nicolas M / Cabarkapa, Dimitrije / Blackburn, Stryder D / Fry, Andrew C

Journal of strength and conditioning research

2024 Volume 38, Issue 5, Page(s) e253–e263

Abstract: Abstract: Philipp, NM, Cabarkapa, D, Blackburn, SD, and Fry, AC. Dose-response relationship ...

Abstract	Abstract: Philipp, NM, Cabarkapa, D, Blackburn, SD, and Fry, AC. Dose-response relationship for external workload and neuromsuclar performance over a female, collegiate, basketball season. J Strength Cond Res 38(5): e253-e263, 2024-The aim of this study was to investigate the relationship between external workload exposure and changes in countermovement jump force-time characteristics over the course of an entire basketball season, in a sample of National Collegiate Athletic Association Division I, female, basketball players. Data for 12 players were retrospectively analyzed, with external workload being quantified by means of an exponentially weighted, acute, and chronic workload, as well as an acute:chronic workload ratio derived from an inertial measurement unit-based system worn by athletes for all practices and games during the regular season. Countermovement jumps were performed on a total of 26 test days over the span of the in-season competitive period. To statistically analyze these relationships, and to account for multiple observations of the same athletes in a data set, linear mixed-effects models with athlete identity (ID) intercept as the random effect were used. Study findings suggested that associations between external workload exposure and respective force-time characteristics after controlling for the random effect of athlete ID were dependent on the specific metric or metric subgroup used, as well as the type of workload exposure (e.g., acute vs. chronic). Force-time signatures from the braking phase (e.g., average braking force) seemed to be particularly associated with higher degrees of acute workload exposure, whereas strategy-based metrics such as countermovement depth showed significant associations with chronic workload exposure. Furthermore, model results suggested the importance of analyzing neuromuscular responses to external workload on an individual basis, rather than across an entire team. Findings might help practitioners in their selection process related to metrics of interest in monitoring neuromuscular fatigue and readiness.
MeSH term(s)	Humans ; Female ; Basketball/physiology ; Athletic Performance/physiology ; Young Adult ; Retrospective Studies ; Athletes/statistics & numerical data ; Workload ; Muscle Strength/physiology
Language	English
Publishing date	2024-01-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	1156349-7
ISSN	1533-4287 ; 1064-8011
ISSN (online)	1533-4287
ISSN	1064-8011
DOI	10.1519/JSC.0000000000004705
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Article ; Online: Fatigue-Induced Neuromuscular Performance Changes in Professional Male Volleyball Players.

Cabarkapa, Damjana V / Cabarkapa, Dimitrije / Whiting, Shay M / Fry, Andrew C

Sports (Basel, Switzerland)

2023 Volume 11, Issue 6

Abstract: The purpose of the present study was to assess pre-post practice changes in countermovement vertical jump (CVJ) force-time metrics and to determine the relationship between internal and external load variables within a cohort of professional male ... ...

Abstract	The purpose of the present study was to assess pre-post practice changes in countermovement vertical jump (CVJ) force-time metrics and to determine the relationship between internal and external load variables within a cohort of professional male volleyball players. Ten elite athletes competing in one of the top professional European leagues participated in the present study. While standing on a uni-axial force plate, each athlete performed three CVJs immediately prior to the regular training session. Each athlete wore an inertial measurement unit (Vert
Language	English
Publishing date	2023-06-16
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2704239-X
ISSN	2075-4663 ; 2075-4663
ISSN (online)	2075-4663
ISSN	2075-4663
DOI	10.3390/sports11060120
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Article ; Online: Regulatory Light-Chain Phosphorylation During Weightlifting Training: Association With Postactivation Performance Enhancement.

Chiu, Loren Z F / Fry, Andrew C / Galpin, Andrew J / Salem, George J / Cabarkapa, Dimitrije

Journal of strength and conditioning research

2023 Volume 37, Issue 10, Page(s) e563–e568

Abstract: Abstract: Chiu, LZF, Fry, AC, Galpin, AJ, Salem, GJ, and Cabarkapa, D. Regulatory light-chain ...

Abstract	Abstract: Chiu, LZF, Fry, AC, Galpin, AJ, Salem, GJ, and Cabarkapa, D. Regulatory light-chain phosphorylation during weightlifting training: association with postactivation performance enhancement. J Strength Cond Res 37(10): e563-e568, 2023-Postactivation performance enhancement has been reported for multijoint resistance exercise, with both neural and intrinsic muscle mechanisms suggested as contributing factors. The purpose of this investigation was to examine whether regulatory light-chain (RLC) phosphorylation in a primary mover is associated with enhanced weightlifting performance. Nine male athletes performed 15 sets of 3 repetitions of a multijoint weightlifting activity (clean pull) at 85% 1 repetition maximum. Measures of performance, peak barbell velocity (PV), and average barbell power (AP) were determined by video analysis. Muscle biopsies were taken within 30-60 seconds of completion of the previous lifting set from the vastus lateralis before (PRE), during (MID), and after (POST) a training session. AP was significantly greater for sets 3, 4, and 5 compared with set 1, with large effect sizes (0.8-1.0). Increases in PV did not reach significance; however, the effect size increase for sets 3 and 4 versus set 1 was moderate (0.4). Relative change scores for AP and RLC phosphorylation were positively and negatively correlated at MID (r = 0.60; p = 0.05) and POST (r = -0.74; p = 0.01) exercise, respectively. These data suggest that RLC phosphorylation initially may be associated with postactivation performance enhancement during repeated multijoint exercise.
MeSH term(s)	Male ; Humans ; Phosphorylation ; Exercise ; Weight Lifting ; Athletes ; Biopsy
Language	English
Publishing date	2023-09-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	1156349-7
ISSN	1533-4287 ; 1064-8011
ISSN (online)	1533-4287
ISSN	1064-8011
DOI	10.1519/JSC.0000000000004585
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Article ; Online: Impact of the Anatomical Accelerometer Placement on Vertical Jump Performance Characteristics.

Cabarkapa, Damjana V / Cabarkapa, Dimitrije / Philipp, Nicolas M / Fry, Andrew C

Sports (Basel, Switzerland)

2023 Volume 11, Issue 4

Abstract: With rapid technological development over recent years, the use of wearable athlete monitoring devices has substantially gained popularity. Thus, the purpose of the present study was to examine the impact of the anatomical placement of an accelerometer ... ...

Abstract	With rapid technological development over recent years, the use of wearable athlete monitoring devices has substantially gained popularity. Thus, the purpose of the present study was to examine the impact of the anatomical placement of an accelerometer on biomechanical characteristics of countermovement vertical jump with and without an arm swing when compared to the force plate as a criterion measure. Seventeen recreationally active individuals (ten males and seven females) volunteered to participate in the present study. Four identical accelerometers sampling at 100 Hz were placed at the following anatomical locations: upper-back (UB), chest (CH), abdomen (AB), and hip (HP). While standing on a uni-axial force plate system sampling at 1000 Hz, each participant completed three non-sequential maximal countermovement vertical jumps with and without an arm swing. All devices recorded the data simultaneously. The following variables of interest were obtained from ground reaction force curves: peak concentric force (PCF), peak landing force (PLF), and vertical jump height (VJH). The findings of the present study reveal that the most appropriate anatomical locations to place the accelerometer device when attempting to estimate PCF, PLF, and VJH during a countermovement vertical jump with no arm swing are CH, AB, and UB, and during a countermovement vertical jump with an arm swing are UB, HP, and UB, respectively. Overall, these findings may help strength and conditioning professionals and sports scientists to select appropriate anatomical locations when using innovative accelerometer technology to monitor vertical jump performance characteristics.
Language	English
Publishing date	2023-04-21
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2704239-X
ISSN	2075-4663 ; 2075-4663
ISSN (online)	2075-4663
ISSN	2075-4663
DOI	10.3390/sports11040092
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Article ; Online: Position-specific differences in countermovement vertical jump force-time metrics in professional male basketball players.

Cabarkapa, Dimitrije / Philipp, Nicolas M / Cabarkapa, Damjana V / Fry, Andrew C

Frontiers in sports and active living

2023 Volume 5, Page(s) 1218234

Abstract: The countermovement vertical jump (CVJ) is one of the most commonly implemented non-invasive and time-efficient testing modalities for lower-body neuromuscular performance assessment. With more practitioners having access to portable force plates, the ... ...

Abstract	The countermovement vertical jump (CVJ) is one of the most commonly implemented non-invasive and time-efficient testing modalities for lower-body neuromuscular performance assessment. With more practitioners having access to portable force plates, the purpose of this study was to examine position-specific differences in CVJ force-time metrics within a cohort of elite professional male basketball athletes. Twenty-eight athletes competing in top-tier European basketball leagues volunteered to participate in the present study. Following familiarization with testing procedures and a standardized warm-up protocol, each athlete performed three maximal-effort CVJ on a uni-axial force plate system with hands on the hips during the entire movement. To minimize the possible influence of fatigue, each jump trial was separated by an approximately 15-s rest interval. The mean value across three jumps was used for performance analysis purposes. The findings of the present study reveal notable position-specific differences during the eccentric phase of the CVJ, with centers having greater braking impulse, mean force, and mean power when compared to guards. However, when normalized by body mass, the observed differences during the eccentric phase of the CVJ were nonexistent. On the other hand, no significant differences in absolute mean and peak force and power were detected during the concentric phase of the CVJ. Yet, when normalized by the player's body mass, centers demonstrated inferior performance than guards for the same force-time metrics. Overall, these findings may help practitioners obtain a better insight into position-specific differences with regards to CVJ force-time characteristics as well as aid with individually tailored training regimen design.
Language	English
Publishing date	2023-07-20
Publishing country	Switzerland
Document type	Journal Article
ISSN	2624-9367
ISSN (online)	2624-9367
DOI	10.3389/fspor.2023.1218234
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Article ; Online: Changes in countermovement jump force-time characteristic in elite male basketball players: A season-long analyses.

Philipp, Nicolas M / Cabarkapa, Dimitrije / Nijem, Ramsey M / Fry, Andrew C

PloS one

2023 Volume 18, Issue 9, Page(s) e0286581

Abstract: Basketball is a sport that is characterized by various physical performance parameters and motor abilities such as speed, strength, and endurance, which are all underpinned by an athlete's efficient use of the stretch-shortening cycle (SSC). A common ... ...

Abstract	Basketball is a sport that is characterized by various physical performance parameters and motor abilities such as speed, strength, and endurance, which are all underpinned by an athlete's efficient use of the stretch-shortening cycle (SSC). A common assessment to measure SSC efficiency is the countermovement jump (CMJ). When performed on a force plate, a plethora of different force-time metrics may be gleaned from the jump task, reflecting neuromuscular performance characteristics. The aim of this study was to investigate how different CMJ force-time characteristics change across different parts of the athletic year, within a sample of elite collegiate male basketball players. Twelve basketball players performed CMJ's on near-weekly basis, combining for a total of 219 screenings. The span of testing was broken down into four periods: pre-season, non-conference competitive period, conference competitive period, and post-season competitive period. Results suggest that basketball players were able to experience improvements and maintenance of performance with regards to various force-time metrics, transitioning from the pre-season period into respective later phases of the in-season period. A common theme was a significant improvement between the pre-season period and the non-conference period. Various force-time metrics were subject to change, while outcome metrics such as jump height remained unchanged, suggesting that practitioners are encouraged to more closely monitor how different force-time characteristics change over extended periods of time.
MeSH term(s)	Male ; Humans ; Basketball ; Seasons ; Benchmarking ; Bone Plates ; Nutritional Status
Language	English
Publishing date	2023-09-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	2267670-3
ISSN	1932-6203 ; 1932-6203
ISSN (online)	1932-6203
ISSN	1932-6203
DOI	10.1371/journal.pone.0286581
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Article ; Online: Competitive Season-Long Changes in Countermovement Vertical Jump Force-Time Metrics in Female Volleyball Players.

Cabarkapa, Damjana V / Cabarkapa, Dimitrije / Philipp, Nicolas M / Fry, Andrew C

Journal of strength and conditioning research

2023 Volume 38, Issue 2, Page(s) e72–e77

Abstract: Abstract: Cabarkapa, DV, Cabarkapa, D, Philipp, NM, and Fry, AC. Competitive season-long changes ...

Abstract	Abstract: Cabarkapa, DV, Cabarkapa, D, Philipp, NM, and Fry, AC. Competitive season-long changes in countermovement vertical jump force-time metrics in female volleyball players. J Strength Cond Res 38(2): e72-e77, 2024-Although force plates remain one of the most widely used tools for neuromuscular performance assessment in applied sports-specific settings, there is still a lack of scientific literature focused on studying changes in countermovement vertical jump (CVJ) performance in team sports such as volleyball, especially within the female athlete population. Thus, the purpose of the present study was to examine season-long neuromuscular performance changes in volleyball players. Eighteen National Association of Intercollegiate Athletics Division-I collegiate female athletes performed 3 maximal-effort CVJs while standing on a uniaxial force plate system sampling at 1,000 Hz at 5 different testing timepoints throughout a competitive season span (∼11 weeks). The testing sessions were separated 2-3 weeks apart and performed at the approximately same time of the day (12:00 hours). Repeated-measures analysis of variance revealed that both concentric and eccentric force-time metrics remain relatively unchanged throughout a regular season span (e.g., concentric peak force and power, eccentric impulse and duration). However, the eccentric metrics such as peak and mean power and peak velocity displayed a slight improvement after a brief tapering period purposely implemented before the post-season competition to optimize the athlete's recovery (∼15, 18, and 14% increase, respectively). In addition, the outcome metrics such as vertical jump height and reactive strength index-modified did not display notable fluctuations across the competitive season span. These findings can help coaches, sports scientists, and strength and conditioning practitioners to obtain a deeper insight into collegiate female athletes' force-time characteristics that may aid with developing adequate training regimens targeted toward optimizing on-court performance.
MeSH term(s)	Humans ; Female ; Volleyball ; Seasons ; Athletes ; Standing Position ; Team Sports
Language	English
Publishing date	2023-03-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	1156349-7
ISSN	1533-4287 ; 1064-8011
ISSN (online)	1533-4287
ISSN	1064-8011
DOI	10.1519/JSC.0000000000004713
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Article ; Online: Strength and Power Thresholds to Identify High and Low Linear Sprint Speed Performers in Collegiate American Football Players.

Philipp, Nicolas M / Crawford, Derek A / Cabarkapa, Dimitrije / Fry, Andrew C

Journal of strength and conditioning research

2023 Volume 38, Issue 1, Page(s) 74–79

Abstract: Abstract: Philipp, NM, Crawford, DA, Cabarkapa, D, and Fry, AC. Strength and power thresholds ...

Abstract	Abstract: Philipp, NM, Crawford, DA, Cabarkapa, D, and Fry, AC. Strength and power thresholds to identify high and low linear sprint speed performers in collegiate American football players. J Strength Cond Res 38(1): 74-79, 2024-Lower-body strength and power are commonly measured performance qualities across a number of sports. In recent years, more attention has been given to relationships, primarily between lower-body strength and linear speed performance. While still limited, evidence is in agreement that lower-body strength positively contributes to linear speed performance. However, what is less well understood is if there comes a point in an athlete's development, at which, further working on increasing maximal strength may not fully compliment additional gains in speed performance. Within this study, authors aimed to provide practitioners with lower-body strength and power thresholds that can discriminate between slow and fast performers, within a group of collegiate American football players. The sample was further divided into a high-body and low-body weight group, and authors hypothesized that by using logistic regression, supplemented with receiver operator curve analyses, optimal cut-off points (i.e., relative lower-body strength thresholds) that are able to significantly discriminate between slow and fast linear speed performers may be identified. Findings indicate that optimal cut-off scores differed between the groups of athletes, as well as the lower body strength and power tests. All models were able to significantly distinguish between slower and faster performers, and area under the curve values ranged from 0.695 to 0.903. Although thresholds will likely vary based on factors such as sex, training age, and sport, findings from this investigation may be used to benchmark athletes and to further individualize training aimed at improving linear speed performance.
MeSH term(s)	Humans ; Football ; Athletic Performance ; Universities ; Athletes ; Muscle Strength
Language	English
Publishing date	2023-10-06
Publishing country	United States
Document type	Journal Article
ZDB-ID	1156349-7
ISSN	1533-4287 ; 1064-8011
ISSN (online)	1533-4287
ISSN	1064-8011
DOI	10.1519/JSC.0000000000004600
Database	MEDical Literature Analysis and Retrieval System OnLINE

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