Journal of Strength and Conditioning Research This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Acute Effects of High-Intensity Interval Exercise While Wearing a Sauna Suit on Energy Expenditure and Excess Post-exercise Oxygen Consumption
Matthews, ARD, Astorino, TA, Crocker, GH, and Sheard, AC. Acute effects of high-intensity interval exercise while wearing a sauna suit on energy expenditure and excess post-exercise oxygen consumption. J Strength Cond Res 36(9): 2427–2433, 2022—The use of sauna suits has increased because of claims that they enhance weight loss and increase body temperature during exercise. Therefore, the purpose of this study was to examine changes in energy expenditure (EE) and excess post-exercise oxygen consumption (EPOC) in response to high-intensity interval exercise (HIIE) while wearing a sauna suit. Twelve recreationally active...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Mechanical Energy Expenditure at Lumbar Spine and Lower Extremity Joints During the Single-Leg Squat Is Affected by the Nonstance Foot Position
Hirsch, SM, Chapman, CJ, Frost, DM, and Beach, TAC. Mechanical energy expenditure at lumbar spine and lower extremity joints during the single-leg squat is affected by the nonstance foot position. J Strength Cond Res 36(9): 2417–2426, 2022—Previous research has shown that discrete kinematic and kinetic quantities during bodyweight single-leg squat (SLS) movements are affected by elevated foot positioning and sex of the performer, but generalizations are limited by the high-dimensional data structure reported. Using a 3D inverse dynamical linked-segment model, we quantified mechanical energy expenditure (MEE) at each jo...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Perceptual and Neuromuscular Responses Adapt Similarly Between High-Load Resistance Training and Low-Load Resistance Training With Blood Flow Restriction
This study compared the effects of 8 weeks of low-load resistance training with blood flow restriction (LL-BFR) and high-load resistance training (HL-RT) on perceptual responses (rating of perceived exertion [RPE] and pain), quadriceps cross-sectional area (QCSA), and muscle strength (1 repetition maximum [RM]). Sixteen physically active men trained twice per week, for 8 weeks. One leg performed LL-BFR (3 sets of 15 repetitions, 20% 1RM), whereas the contralateral leg performed HL-RT (3 sets of 8 repetitions, 70% 1RM). Rating of perceived exertion and pain were evaluated immediately after the first and last training sessio...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Strength and Electromyographic Responses of Upper and Lower Limbs During Maximal Intermittent Contractions in Males and Females
This study examined the strength and electromyographic (EMG) responses of upper vs. lower limb muscles during intermittent maximal contractions in both sexes. Twenty subjects (n = 7 women) performed a fatiguing protocol (6, 30-second intermittent maximal isometric contractions with a 50% duty cycle) with either the elbow flexors or the knee extensors on separate visits. Bipolar surface EMG signals were detected from the biceps brachii and vastus lateralis muscles (n = 5 women retained). Women maintained more of their maximal force than men (Δforce: men vs. women = −55.0 ± 12.8% vs. −43.3 ± 9.9%, p = 0.042). Although...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Analyzing Force-Time Curves: Comparison of Commercially Available Automated Software and Custom MATLAB Analyses
Merrigan, JJ, Stone, JD, Galster, SM, and Hagen, JA. Analyzing force-time curves: Comparison of commercially available automated software and custom MATLAB analyses. J Strength Cond Res 36(9): 2387–2402, 2022—With the growing prevalence of commercial force plate solutions providing automated force-time curve analysis, it is critical to understand the level of agreement across techniques. Thus, this study directly compared commercial and custom software analyses across force-time curves. Twenty-four male and female subjects completed 6 trials of countermovement, squat, and drop jumps, and isometric mid-thigh pulls on th...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

The Acute Effects of Accentuated Eccentric Loading on Drop Jump Kinetics in Adolescent Athletes
Lloyd, RS, Howard, SW, Pedley, JS, Read, PJ, Gould, ZI, and Oliver, JL. The acute effects of accentuated eccentric loading on drop jump kinetics in adolescent athletes. J Strength Cond Res 36(9): 2381–2386, 2022—The purpose of the study was to determine the acute effects of accentuated eccentric loading (AEL) on drop jump kinetics in adolescent athletes. Fifteen male rugby players (mean ± SD: age = 16.2 ± 1.01, body mass = 73.38 ± 9.94, and height = 178.91 ± 6.74) completed 3 trials of a drop jump with and without an accentuated eccentric load using a dumbbell release technique that equated to 15% body mass. The ad...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Does the Muscle Action Duration Induce Different Regional Muscle Hypertrophy in Matched Resistance Training Protocols?
In conclusion, this study showed that matched RT protocols with different MAD resulted in different region-specific muscle hypertrophic across the individual muscles of QF. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

Effects of Combined Strength and Endurance Training on Body Composition, Physical Fitness, and Serum Hormones During a 6-Month Crisis Management Operation
Pihlainen, K, Kyröläinen, H, Santtila, M, Ojanen, T, Raitanen, J, and Häkkinen, K. Effects of combined strength and endurance training on body composition, physical fitness, and serum hormones during a 6-month crisis management operation. J Strength Cond Res 36(9): 2361–2370, 2022—Very few studies have examined the impact of training interventions on soldier readiness during an international military operation. Therefore, the present study investigated the effects of combined strength and endurance training on body composition, physical performance, and hormonal status during a 6-month international military deploym...
Source: Journal of Strength and Conditioning Research - August 30, 2022 Category: Sports Medicine Tags: Original Research Source Type: research

NSCA Spain Abstracts 2021
No abstract available (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Abstracts Source Type: research

Wearing Compression Garment Enhances Central Hemodynamics? A Systematic Review and Meta-Analysis
Lee, DCW, Ali, A, Sheridan, S, Chan, DKC, and Wong, SHS. Wearing compression garment enhances central hemodynamics? a systematic review and meta-analysis. J Strength Cond Res 36(8): 2349–2359, 2022—Compression garments (CG) are believed to enhance exercise performance and recovery by improving central hemodynamic responses. However, evidence is inconclusive. We performed a systematic review and meta-analysis to determine the effect of wearing CG at rest or after a physiological challenge on central hemodynamic responses, including cardiac output, stroke volume (SV), heart rate (HR), systolic blood pressure, diastolic b...
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Brief Review Source Type: research

Effects of Pre-exercise Acute Vibration Training on Symptoms of Exercise-Induced Muscle Damage: A Systematic Review and Meta-Analysis
The objective of this meta-analysis is to examine the effects of acute VT on symptoms of EIMD when performed as the pre-exercise intervention. Randomized controlled trials (RCTs) published in the 8 databases of Cochrane Library, PubMed, Embase, Web of Science, EBSCO, China National Knowledge Infrastructure, Airiti Library and WanFang Data from 1966 (the earliest available time) to January 2019 were searched. A total of 2,324 records were identified and 448 articles were screened with the title and abstract. Two investigators identified eligible studies, extracted data, and assessed the risk of bias independently. Review Ma...
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Brief Review Source Type: research

Validity and Reliability of a Motorized Sprint Resistance Device
In conclusion, the present study shows that the 1080 Sprint is valid and reliable for sprint performance monitoring purposes. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Technical Report Source Type: research

A Novel Strategy to Determine the 1-Repetition Maximum in the Jump Squat Exercise
This study aimed to determine the maximum relative load of the half-squat (HS; i.e., % HS 1-repetition maximum [1RM]) that can be used in its ballistic variation, namely, the jump squat (JS) exercise, and to examine whether this reference value varies in subjects with different strength levels. In total, 186 elite athletes from 10 distinct sport disciplines participated in this study. A progressive loading test up to HS 1RM was performed during the competitive phase of the season for all athletes. Mean propulsive velocity and propulsive phase duration were also assessed during the 1RM test. Athletes were divided into 3 dis...
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Technical Report Source Type: research

A Research Note on Relationships Between the Vertical Jump and Standing Broad Jump in Law Enforcement Recruits: Implications for Lower-Body Power Testing
Lockie, RG, Moreno, MR, and Dawes, JJ. A research note on relationships between the vertical jump and standing broad jump in law enforcement recruits: implications for lower-body power testing. J Strength Cond Res 36(8): 2326–2329, 2022—Jump testing is often used to infer lower-body power in law enforcement recruits. The vertical jump (VJ) is most common, but can be equipment-intensive. The standing broad jump (SBJ) also provides a measure of lower-body power, requires less equipment, and could be practical for training staff with limited resources. There has been no analysis of the relationships between the VJ and SBJ...
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Research Notes Source Type: research

A rs936306 C/T Polymorphism in the CYP19A1 Is Associated With Stress Fractures
This study demonstrated that the C allele in the CYP19A1 rs936306 polymorphism is a risk factor for SFs in top-level Japanese athletes. (Source: Journal of Strength and Conditioning Research)
Source: Journal of Strength and Conditioning Research - August 1, 2022 Category: Sports Medicine Tags: Research Notes Source Type: research