Effects of Physical Exercise on the Expression of Micrornas: A Systematic Review: Corrigendum
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Erratum Source Type: research

Erratum
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Erratum Source Type: research

Essential Skills for Superior Wave-Riding Performance: A Systematic Review
Forsyth, JR, Riddiford-Harland, DL, Whitting, JW, Sheppard, JM, and Steele, JR. Essential skills for superior wave-riding performance: A systematic review. J Strength Cond Res 34(10): 3003–3011, 2020—To successfully and safely perform surfing maneuvers, surfers and their coaches need to know how to perform each maneuver correctly. Although some components of the sport are well understood, evidence-based recommendations in the scientific literature on how to perform surfing skills are sparse. The aim of this article was to systematically review the body of literature pertaining to discrete wave-riding skills and...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

Resistance Training Improves a Cellular Health Parameter in Obese Older Women: A Randomized Controlled Trial
Ribeiro, AS, Schoenfeld, BJ, dos Santos, L, Nunes, JP, Tomeleri, CM, Cunha, PM, Sardinha, LB, and Cyrino, ES. Resistance training improves a cellular health parameter in obese older women: a randomized controlled trial. J Strength Cond Res 34(10): 2996–3002, 2020—Phase angle (PhA) is a viable indicator of cellular health, with higher values reflecting better cellularity, cell membrane integrity, and cell function. Adaptive responses to resistance training (RT) on PhA may be important in obese older people. The main purpose of the present study was to investigate the effects of 8 weeks of RT on PhA in obese olde...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Different Weekly Sets-Equated Resistance Training Frequencies on Muscular Strength, Muscle Mass, and Body Fat in Older Women
Pina, FLC, Nunes, JP, Schoenfeld, BJ, Nascimento, MA, Gerage, AM, Januário, RSB, Carneiro, NH, Cyrino, ES, and Oliveira, AR. Effects of different weekly sets-equated resistance training frequencies on muscular strength, muscle mass and body fat in older women. J Strength Cond Res 34(10): 2990–2995, 2020—The aim of this study was to analyze the effects of different resistance training (RT) frequencies (2 vs. 3 times per week) with an equivalent number of weekly sets performed between conditions on muscular strength and body composition in older women. Forty-seven older women (65 ± 4 years) were div...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Upper-Body Strength Measures and Pop-Up Performance of Stronger and Weaker Surfers
Parsonage, J, Secomb, JL, Sheppard, JM, Ferrier, BK, Dowse, RA, and Nimphius, S. Upper-body strength measures and pop-up performance of stronger and weaker surfers. J Strength Cond Res 34(10): 2982–2989, 2020—The primary purpose of this study was to investigate the reliability of the isometric push-up (IPU), dynamic push-up (DPU), and force plate pop-up (FP POP) as measures of upper-body isometric and dynamic strength qualities in surfing athletes. Furthermore, the study aimed to compare pop-up performance between stronger and weaker surfers. Eighteen female (n = 9) and male (n = 9) surfers (age = 28.1 ±...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Heart Rate Variability Changes From Traditional vs. Ultra–Short-Term Recordings in Relation to Preseason Training Load and Performance in Futsal Players
Nakamura, FY, Antunes, P, Nunes, C, Costa, JA, Esco, MR, and Travassos, B. Heart rate variability changes from traditional vs. ultra–short-term recordings in relation to preseason training load and performance in futsal players. J Strength Cond Res 34(10): 2974–2981, 2020—The aims of this study were to analyze heart rate variability (HRV) changes in futsal players during preseason training using both “criterion” (10-minute) and ultra-shortened (2-minute) measures, and to determine whether they were related to changes in the Yo-Yo Intermittent Recovery Test, level 1 (Yo-Yo IR1) performance and ...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Changes in Parameters of Oxidative Stress, Immunity, and Behavior in Endurance Athletes During a Preparation Period in Winter
In conclusion, 3 months of regular training in winter induced prominent changes in cytokines, biomarkers of oxidative stress, and antioxidative enzyme activity. These changes might increase susceptibility of athletes to disease and muscle damage and consequently lead to performance reduction. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Training and Competition Activity Profiles of Australian Football Field Umpires
Jessiman, SW, Harvey, B, Corrigan, SL, and Gastin, PB. Training and competition activity profiles of Australian football field umpires. J Strength Cond Res 34(10): 2956–2964, 2020—The purpose of this study was to determine the activity profiles of Australian football (AF) field umpires during training and competition, and subsequently assess the specificity to competition of locomotor training sessions. Microtechnology incorporating a 5-Hz (interpolated to 15 Hz) global positioning system sensor tracked the movements of 24 field umpires during matches at the Melbourne Cricket Ground and fitness and skill-based ...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Isometric Midthigh Pull Characteristics in Elite Youth Male Soccer Players: Comparisons by Age and Maturity Offset
This study provides comparative IMTP force-time characteristics of elite male youth soccer players. Practitioners should consider individual maturation status when comparing players given the impact this has on force expression. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Strength Determinants of Jump Height in the Jump Throw Movement in Women Handball Players
McGhie, D, Østerås, S, Ettema, G, Paulsen, G, and Sandbakk, Ø. Strength determinants of jump height in the jump throw movement in women handball players. J Strength Cond Res 34(10): 2937–2946, 2020—The purpose of the study was to improve the understanding of the strength demands of a handball-specific jump through examining the associations between jump height in a jump throw jump (JTJ) and measures of lower-body maximum strength and impulse in handball players. For comparison, whether the associations between jump height and strength differed between the JTJ and the customarily used counter...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Monitoring Training Load and Perceived Recovery in Female Basketball: Implications for Training Design
This study investigated the relationship between internal training load and perceived recovery of semi-professional female basketball players during the competitive season. Eleven female players were monitored for 14 weeks during the in-season phase. For each event (training and game), data were collected as follows: (a) Total Quality Recovery (TQR) score before the event (TQRpre); (b) session Rating of Perceived Exertion (sRPE) 20 minutes after completion of the event, to calculate training load (s-TL) of the event; and (c) TQR scores 12 (TQRpost12) and 24 hours (TQRpost24) after the event. Data were analyzed for daily, w...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Monitoring the External and Internal Load Under 2 Teaching Methodologies
González-Espinosa, S, Antúnez, A, Feu, S, and Ibáñez, SJ. Monitoring the external and internal load under 2 teaching methodologies. J Strength Cond Res 34(10): 2920–2928, 2020—The purpose of this study was to analyze and compare the physical demands produced by the implementation of 2 sport teaching methods during a class and their relation with the learning achieved by the students. Two intervention programs were used to teach the sport of basketball, one based on the direct instruction (DI) method and the other on the tactical-game approach (TGA). The intervention programs were adm...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Knowledge, Attitudes, and Beliefs of Youth Sports Coaches Regarding Sport Volume Recommendations and Sport Specialization
Post, EG, Trigsted, SM, Schaefer, DA, Cadmus-Bertram, LA, Watson, AM, McGuine, TA, Brooks, MA, and Bell, DR. Knowledge, attitudes, and beliefs of youth sports coaches regarding sport volume recommendations and sport specialization. J Strength Cond Res 34(10): 2911–2919, 2020—Overuse injuries in youth athletes are becoming increasingly common, which may be a result of the prevalence of year-round specialized sport participation. Previous research has identified sport volume recommendations related to months per year, hours per week, and simultaneous participation in multiple sports leagues. Coaches are a primary...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Lower-Body Muscular Fatigue on Vertical Jump and Balance Performance
Cooper, CN, Dabbs, NC, Davis, J, and Sauls, NM. Effects of lower-body muscular fatigue on vertical jump and balance performance. J Strength Cond Res 34(10): 2903–2910, 2020—Lower-body fatigue can lead to a decline in vertical jump (VJ) and balance performance due to decreased motor control and coordination. The purpose is to determine the effects of lower-body fatigue on VJ and balance performance. Twenty-four recreationally trained individuals participated in a single 1-hour familiarization and testing session. Participants were familiarized with balance, countermovement vertical jump (CMVJ), and static vertic...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Eccentric Cycling Performed at Long vs. Short Muscle Lengths on Heart Rate, Rate Perceived Effort, and Muscle Damage Markers
Peñailillo, L, Aedo, C, Cartagena, M, Contreras, A, Reyes, A, Ramirez-Campillo, R, Earp, JE, and Zbinden-Foncea, H. Effects of eccentric cycling performed at long vs. short muscle lengths on heart rate, rate perceived effort, and muscle damage markers. J Strength Cond Res 34(10): 2895–2902, 2020—It is possible that the magnitude of muscle damage in eccentric cycling is dependent on seat position that could affect the muscle length changes during eccentric contractions. However, no previous study has investigated the effect of seat position on muscle damage and metabolic demand in eccentric exercise. Thus...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Immune Response Related With Skin Thermal Pattern in Judokas: A New Application for Infrared Thermography?
In conclusion, the BST and immune response after judo training seem to be not associated. However, when the skin thermal pattern is considered, the SPT skin thermal pattern presented a lower post-training BST, blood leukocytes, and neutrophils in comparison with the LOC group. These results show a possible relationship between skin thermal pattern and immune responses for the first time; however, further studies are needed to confirm the evidence presented here. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Explosive Push-ups: From Popular Simple Exercises to Valid Tests for Upper-Body Power
Zalleg, D, Ben Dhahbi, A, Dhahbi, W, Sellami, M, Padulo, J, Souaifi, M, Bešlija, T, and Chamari, K. Explosive push-ups: From popular simple exercises to valid tests for upper-body power. J Strength Cond Res 34(10): 2877–2885, 2020—The purpose of this study was to assess the logical and ecological validity of 5 explosive push-up variations as a means of upper-body power assessment, using the factorial characterization of ground reaction force-based (GRF-based) parameter outputs. Thirty-seven highly active commando soldiers (age: 23.3 ± 1.5 years; body mass: 78.7 ± 9.7 kg; body height: 179.7 ...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Time Course of Recovery From Resistance Exercise With Different Set Configurations
In conclusion, resistance exercise to failure resulted in greater fatigue accumulation and slower rates of neuromuscular recovery, as well as higher hormonal responses and greater muscle damage, especially when the maximal number of repetitions in the set was high. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Acute Effects of Battle Rope Exercise on Performance, Blood Lactate Levels, Perceived Exertion, and Muscle Soreness in Collegiate Basketball Players
This study investigated the acute effects of battle rope (BR) exercise on basketball players' performance, blood lactate levels, rating of perceived exertion (RPE), and perceived muscle soreness. Fifteen well-trained Division-I male basketball players underwent the same test procedure at baseline, before BR exercise (30 minutes of rest after the baseline test), and after BR exercise. The 30-minute experimental protocol comprised 6 BR exercises at a work-to-rest ratio of 1:2 (20-second exercise and 40-second rest). Shooting accuracy, basketball chest pass speed, countermovement jump (CMJ) height, blood lactate levels, RPE (...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Normative Reference Values for High School-Aged American Football Players
McKay, BD, Miramonti, AA, Gillen, ZM, Leutzinger, TJ, Mendez, AI, Jenkins, NDM, and Cramer, JT. Normative reference values for high school-aged American football players. J Strength Cond Res 34(10): 2849–2856, 2020—The purpose of the present report was to provide test- and position-specific normative reference values for combine test results based on a large, nationally representative sample of high school-aged American football players in their freshman, sophomore, and junior classes. Cross-sectional anthropometric and performance data were obtained from 12 different high school American football recruiting co...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Lumbopelvic-Hip Complex and Scapular Stabilizing Muscle Activations During Full-Body Exercises With and Without Resistance Bands
Wasserberger, KW, Downs, JL, Barfield, JW, Williams, TK, and Oliver, GD. Lumbopelvic-hip complex and scapular stabilizing muscle activations during full-body exercises with and without resistance bands. J Strength Cond Res 34(10): 2840–2848, 2020—Inefficient sequencing in the kinetic chain has been linked to decreased performance and increased injury risk. Resistance band usage is very common in baseball/softball due to accessibility and low cost. However, resistance band use has primarily focused on the rotator cuff and surrounding shoulder musculature, thereby ignoring the rest of the kinetic chain. Currently...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Activity Profile of Elite Netball Umpires During Match Play
Spencer, KN, Paget, N, Farley, ORL, and Kilding, AE. Activity profile of elite netball umpires during match play. J Strength Cond Res 34(10): 2832–2839, 2020—The study aimed to determine activity profiles of officials in elite netball. Physical demands of Load·min−1 (au) representing accumulated accelerations by triaxial accelerometers during matches and exercise-to-rest ratio were measured using global positioning systems (Catapult, MinimaxX S4). Physiological demands were quantified by estimated equivalent distance and heart rate (HR) (MeanHR, percentage HRpeak, and HRzones) and movement variable...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Relationships Between Highly Skilled Golfers' Clubhead Velocity and Vertical Ground Reaction Force Asymmetry During Vertical Jumps and an Isometric Midthigh Pull
Wells, JET, Mitchell, ACS, Charalambous, LH, and Fletcher, IM. Relationships between highly skilled golfers' clubhead velocity and vertical ground reaction force asymmetry during vertical jumps and an isometric midthigh pull. J Strength Cond Res 34(10): 2824–2831, 2020—Clubhead velocity (CHV) is a commonly measured variable within golf due to strong associations with increased drive distance. Previous research has revealed significant relationships between CHV and vertical ground reaction force (vGRF) variables during bilateral tasks including a countermovement jump (CMJ), squat jump (SJ), drop jump (DJ), and i...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Interlimb Asymmetries in Youth Tennis Players: Relationships With Performance
Madruga-Parera, M, Bishop, C, Fort-Vanmeerhaeghe, A, Beltran-Valls, MR, Gonzalo-Skok, O, and Romero-Rodríguez, D. Interlimb asymmetries in youth tennis players: relationships with performance. J Strength Cond Res 34(10): 2815–2823, 2020—Change of direction speed (CODS) has been highlighted as a critical component of tennis. Interlimb asymmetries have been commonly studied in jump tests, but less attention given to the topic during CODS. The aim of this study was to quantify interlimb asymmetries in jumping and CODS (during traditional and isoinertial tests) and establish their relationship with measures ...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Profiling the Post-match Top-up Conditioning Practices of Professional Soccer Substitutes: An Analysis of Contextual Influences
Hills, SP, Barrett, S, Busby, M, Kilduff, LP, Barwood, MJ, Radcliffe, JN, Cooke, CB, and Russell, M. Profiling the post-match top-up conditioning practices of professional soccer substitutes: An analysis of contextual influences. J Strength Cond Res 34(10): 2805–2814, 2020—Soccer practitioners implement “top-up” conditioning sessions to compensate for substitutes' limited match-play exposure. Although perceived to be valuable for reducing injury risk and augmenting positive physical adaptations, little research has considered the demands of post-match top-up training. To quantify post-match top-up r...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Relationship Between the Session-RPE and External Measures of Training Load in Youth Soccer Training
Marynowicz, J, Kikut, K, Lango, M, Horna, D, and Andrzejewski, M. Relationship between the session-RPE and external measures of training load in youth soccer training. J Strength Cond Res 34(10): 2800–2804, 2020—The aim of this study was to identify the external training load (TL) markers (10 Hz Global Positioning System) that are most influential on the rating of perceived exertion (RPE) and session-RPE (sRPE) during youth soccer training. Data were collected from 18 youth soccer players during an 18-week in-season period. A total of 804 training observations were undertaken. We observed moderate to very large...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Using the Session Rating of Perceived Exertion to Quantify Training Load in a Men's College Soccer Team
Sams, ML, Wagle, JP, Sato, K, DeWeese, BH, Sayers, AL, and Stone, MH. Using the session rating of perceived exertion to quantify training load in a men's college soccer team. J Strength Cond Res 34(10): 2793–2799, 2020—The purpose of this study was to examine the training load (TL) programming of 3 training groups of a National Collegiate Athletic Association Division I men's college soccer team across a season. Thirty athletes were classified as starters (S), substitutes (NS), or redshirts (RS) based on the percentage of possible minutes played during the season. Training load was quantified at the season, pha...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

A 28-Day Carbohydrate-Restricted Diet Improves Markers of Cardiovascular Disease in Professional Firefighters
This study compared the effects of a 4-week, nonketogenic, carbohydrate-restricted ( (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

The Effect of a Neuromuscular vs. Dynamic Warm-up on Physical Performance in Young Tennis Players
Fernandez-Fernandez, J, García-Tormo, V, Santos-Rosa, FJ, Teixeira, AS, Nakamura, FY, Granacher, U, and Sanz-Rivas, D. The effect of a neuromuscular vs. dynamic warm-up on physical performance in young tennis players. J Strength Cond Res 34(10): 2776–2784, 2020—The aim of this study was to examine performance-enhancing (i.e., training) effects of a neuromuscular warm-up (NWU) compared with a dynamic WU (DWU) in young tennis players. Twenty-eight well-trained male tennis players with a mean age of 15.09 ± 1.16 years participated in this study and were assigned to either a training group performing ...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Survey of Eccentric-Based Strength and Conditioning Practices in Sport
This study investigated the current ECC strength and conditioning practices that are implemented in the training of athletes. Two hundred twenty-four practitioners were electronically surveyed anonymously with 98 responses available for analysis. Nearly all respondents (96%) had prescribed ECC in the last 24 months. Sport performance (64%), injury prevention (24%), and rehabilitation (8%) were the top-ranked reasons to include ECC. Respondents programmed ECC for strength (35%), hypertrophy (19%), and power (18%). A majority of respondents did not monitor ECC load (58%) or use eccentric-specific testing (75%). Seventeen res...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Maturation on Physical Fitness Adaptations to Plyometric Drop Jump Training in Male Youth Soccer Players
The objective of this study was to compare the effects of maturation on physical fitness adaptations to a twice weekly, 7-week plyometric drop jump training program. Seventy-six young male soccer players (aged 10–16 years) participated in this randomized controlled trial. Before and after the intervention, a physical fitness test battery was applied (countermovement jump; drop jump from 20 to 40 cm; 5 multiple bounds test; 20-m sprint time; change of direction speed; 2.4-km running time-trial; 5 repetition maximum [RM] squat; and maximal kicking distance). Participants were randomly divided into an active soccer-cont...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Influence of Resisted Sled-Pull Training on the Sprint Force-Velocity Profile of Male High-School Athletes
Cahill, MJ, Oliver, JL, Cronin, JB, Clark, K, Cross, MR, Lloyd, RS, and Lee, JE. Influence of resisted sled-pull training on the sprint force-velocity profile of male high-school athletes. J Strength Cond Res 34(10): 2751–2759, 2020—Although resisted sled towing is a commonly used method of sprint-specific training, little uniformity exists around training guidelines for practitioners. The aim of this study was to assess the effectiveness of unresisted and resisted sled-pull training across multiple loads. Fifty-three male high-school athletes were assigned to an unresisted (n = 12) or 1 of 3 resisted groups: l...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Short-Term Unilateral Strength Training on Measures of Postural Control When Wearing “Operationally Relevant” Backpack Loads
Krajewski, KT, Bansbach, HM, McLean, L, McKenzie, C, Rawcliffe, A, Graham, SM, Flanagan, SD, Pourmoghaddam, A, Dettmer, M, and Connaboy, C. Effects of short-term unilateral strength training on measures of postural control when wearing “operationally relevant” backpack loads. J Strength Cond Res 34(10): 2743–2750, 2020—To examine the effects of “operationally relevant” loads on postural stability and to determine the effects of unilateral and bilateral strength training programs on postural stability in healthy, recruit-aged men. Fifteen subjects were randomly assigned to either a unilat...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Changes in Bench Press Velocity and Power After 8 Weeks of High-Load Cluster- or Traditional-Set Structures
This study investigated the effects of high-load cluster- vs. traditional-set structures using the bench press on velocity and power. Twenty-one resistance-trained individuals (male = 12, female = 9) performed a 3-week familiarization block followed by randomization into 1 of 2 upper- and lower-body split training routines performed for 8 weeks. The bench press was the only exercise manipulated with subjects using either cluster-set (CLUS, n = 11) or traditional-set (TRAD, n = 10) structures during training sessions. Subjects performed 4 sets of 5 repetitions at 85% 1 repetition maximum (1RM) with CLUS having a 30-second i...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Acute Neuromuscular and Microvascular Responses to Concentric and Eccentric Exercises With Blood Flow Restriction
Lauver, JD, Cayot, TE, Rotarius, TR, and Scheuermann, BW. Acute neuromuscular and microvascular responses to concentric and eccentric exercises with blood flow restriction. J Strength Cond Res 34(10): 2725–2733, 2020—The purpose of this study was to investigate the effects of the addition of blood flow restriction (BFR) during concentric and eccentric exercises on muscle excitation and microvascular oxygenation status. Subjects (N = 17) were randomly assigned to either a concentric (CON, CON + BFR) or eccentric (ECC, ECC + BFR) group, with one leg assigned to BFR and the other to non-BFR. Surface electromyograp...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Kinetic and Electromyographic Responses to Traditional and Assisted Nordic Hamstring Exercise
Burrows, AP, Cleather, D, Mahaffey, R, and Cimadoro, G. Kinetic and electromyographic responses to traditional and assisted Nordic hamstring exercise. J Strength Cond Res 34(10): 2715–2724, 2020—The Nordic hamstring exercise (NHE) is performed to increase hamstring strength, elicit morphological changes, and reduce injury risk. However, to date, the NHE assisted by the means of an external resistance has not been investigated. Thus, this study compared the eccentric knee flexor strength, rating of perceived exertion (RPE), and electromyographic responses of the biceps femoris (BF) and semitendinosus (ST) when p...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Decline in Unintentional Lifting Velocity Is Both Load and Exercise Specific
Beck, M, Varner, W, LeVault, L, Boring, J, and Fahs, CA. Decline in unintentional lifting velocity is both load and exercise specific. J Strength Cond Res 34(10): 2709–2714, 2020—When monitoring the mean concentric velocity (MCV) for velocity-based resistance training, often a threshold in the decline in the MCV is used to regulate the number of repetitions performed. However, it is not clear if the decline in the MCV is affected by the type of exercise or the relative load used. Therefore, the purpose of this study was to compare the decline in the MCV between the overhead press (OHP) and deadlift (DL) during ...
Source: Journal of Strength and Conditioning Research - September 24, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Manuscript Clarification
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Manuscript Clarification: Wooten, SV, Cherup, N, Mazzei, N, Patel, S, Mooney, K, Rafiq, A, and Signorile, JF. Yoga breathing techniques have no impact on isokinetic and isoinertial power. J Strength Cond Res 34(2): 430–439, 2020
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Manuscript Clarification Source Type: research

Sex-Related Differences After a Single Bout of Maximal Eccentric Exercise in Response to Acute Effects: A Systematic Review and Meta-analysis
Morawetz, D, Blank, C, Koller, A, Arvandi, M, Siebert, U, and Schobersberger, W. Sex-related differences after a single bout of maximal eccentric exercise in response to acute effects: a systematic review and meta-analysis. J Strength Cond Res 34(9): 2697–2707, 2020—The most prominent effects after unaccustomed eccentric exercise are muscle damage, muscle soreness, strength loss, and higher concentrations of muscle proteins in the plasma. The aim of this systematic review is to evaluate sex-related differences in these acute effects. A systematic literature search in MEDLINE following the PRISMA guidelines was ...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Brief Review Source Type: research

Validity of the Handheld Doppler to Determine Lower-Limb Blood Flow Restriction Pressure for Exercise Protocols
Laurentino, GC, Loenneke, JP, Mouser, JG, Buckner, SL, Counts, BR, Dankel, SJ, Jessee, MB, Mattocks, KT, Iared, W, Tavares, LD, Teixeira, EL, and Tricoli, V. Validity of the handheld Doppler to determine lower-limb blood flow restriction pressure for exercise protocols. J Strength Cond Res 34(9): 2693–2696, 2020—Handheld (HH) Doppler is frequently used for determining the arterial occlusion pressure during blood flow restriction exercises; however, it is unknown whether the blood flow is occluded when the auscultatory signal is no longer present. The purpose of this study was to assess the validity between the ...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Influence of the Box Dimensions on the Reliability and Validity of the Sit and Reach in Preschoolers
This study aimed at analyzing the reliability and validity of the sit and reach (SR) test, when it was performed with a standard SR (SSR) or an adapted SR (ASR) box in preschoolers. To accomplish this, both tests were administered 3 times (familiarization, test, and retest) to a group of 148 children (mean age, 4.99 ± 0.94 years; 49.3% girls), with a week interval between each assessment. The obtained results in each test were compared with those obtained in the passive straight leg raise (PSLR) test with the aim of identifying their construct validity. The internal consistency was found to be between good and excel...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of 2 Types of Resistance Training Models on Obese Adolescents' Body Composition, Cardiometabolic Risk, and Physical Fitness
Magnani Branco, BH, Carvalho, IZ, Garcia de Oliveira, H, Fanhani, AP, Machado dos Santos, MC, Pestillo de Oliveira, L, Macente, SB, and Nelson, NJ. Effects of 2 types of resistance training models on obese adolescents' body composition, cardiometabolic risk, and physical fitness. J Strength Cond Res 34(9): 2672–2682, 2020—The main objective of this study was to investigate the effects of 2 types of resistance training (RT) models in conjunction with interdisciplinary interventions by other health professionals to reduce the body fat and cardiometabolic risk of obese adolescents while improving their general hea...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Independent and Combined Effects of Weight Status and Maturation on Aerobic Fitness in Adolescent School-Aged Males
This study aimed to examine the independent and combined effects of pubertal and weight status on concurrent measurements of peak oxygen (V̇o2peak) in school-aged adolescent males. The final sample included 49 boys (12.3 ± 0.8 years). V̇o2peak was derived from an incremental progressive maximal protocol using a motorized treadmill. In addition, maximal oxygen uptake was estimated from a 20-m shuttle run test. Static allometric models were obtained as an alternative to performance output per unit of size descriptors. Weight status had a significant effect on V̇o2peak using simple ratio standards per unit of body m...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Comparison of Physical Profiles of State-Level Netball Players by Position
Graham, S, Duthie, G, Aughey, R, and Zois, J. Comparison of physical profiles of state-level netball players by position. J Strength Cond Res 34(9): 2654–2662, 2020—Understanding the physical profiles of state-level netball athletes provides conditioning professionals with testing norms and an understanding of important capacities within particular positions. The purpose was to examine positional differences in physical capacities of state-level netball athletes. Forty-six state-level netball athletes completed physical capacity assessments in the second week of their preseason, over 2 seasons. Tests included s...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Combined Surfaces vs. Single-Surface Plyometric Training on Soccer Players' Physical Fitness
Ramirez-Campillo, R, Álvarez, C, García-Pinillos, F, García-Ramos, A, Loturco, I, Chaabene, H, and Granacher, U. Effects of combined surfaces vs. single-surface plyometric training on soccer players' physical fitness. J Strength Cond Res 34(9): 2644–2653, 2020—The aim of this study was to compare the effects of a 8-week plyometric jump training (PJT) performed on different surfaces (grass, land-dirt, sand, wood, gym mat, and tartan-track) vs. a single-surface PJT (grass) on components of physical fitness (muscle power, speed, and change-of-direction speed [CODS] tasks) and sport-specific pe...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Seasonal Changes in the Physical Performance of Elite Youth Female Soccer Players
This study investigated the seasonal change in physical performance of 113 (Under 10: U10 [n = 20], U12 [n = 30], U14 [n = 31], and U16 [n = 32]) elite youth female soccer players. Players completed testing pre-, mid-, and post-season, including speed (10- and 30-m sprint), change of direction (CoD; 505 test), power (countermovement jump [CMJ]), strength (isometric midthigh pull), and aerobic capacity (Yo-Yo intermittent recovery test level 1 [YYIRL1]). A general linear model was used to evaluate the change in physical characteristics and the influence of covariates (baseline performance; change in maturity status) on each...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Autonomic Cardiac Activity Among Novice Archers During Baseline, Shooting, and Recovery
Tok, S, Dal, N, Zekioğlu, A, Çatıkkaş, F, Balıkçı, İ, and Doğan, E. Autonomic cardiac activity among novice archers during baseline, shooting and recovery. J Strength Cond Res 34(9): 2627–2635, 2020—In the present study, we aimed to investigate whether heart rate variability (HRV) of novice archers may vary during baseline, shooting, and recovery periods. In addition, we aimed to explore whether HRV may have different patterns between successful and less successful archers and man and woman archers. The sample consisted of 39 (12 woman) novice archers ranging in age from 21 to 27. Baseline ...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research

Predicting Bobsled Pushing Ability From Various Combine Testing Events
Tomasevicz, CL, Ransone, JW, and Bach, CW. Predicting bobsled pushing ability from various combine testing events. J Strength Cond Res 34(9): 2618–2626, 2020—The requisite combination of speed, power, and strength necessary for a bobsled push athlete coupled with the difficulty in directly measuring pushing ability makes selecting effective push crews challenging. Current practices by USA Bobsled and Skeleton use field combine testing to assess and identify specifically selected performance variables in an attempt to best predict push performance abilities. Combine data consisting of 11 physical performance var...
Source: Journal of Strength and Conditioning Research - August 28, 2020 Category: Sports Medicine Tags: Original Research Source Type: research