Comparison of the force-, velocity- and power-time curves between the concentric-only and eccentric-concentric bench press exercises

Pérez-Castilla, A; Comfort, P; McMahon, JJ; Pestaña-Melero, FL; García-Ramos, A

doi:10.1519/JSC.0000000000002448

The perceived psychological responsibilities of a strength and conditioning coach (2018)
Journal Article
Radcliffe, J., Comfort, P., & Fawcett, T. (2018). The perceived psychological responsibilities of a strength and conditioning coach. Journal of Strength and Conditioning Research, 32(10), 2853-2862. https://doi.org/10.1519/JSC.0000000000001656

Research is limited in exploring the specific psychology-oriented responsibilities of the strength and conditioning professional. The present research explored the psychological responsibilities adopted by accredited strength and conditioning coaches... Read More about The perceived psychological responsibilities of a strength and conditioning coach.

Ultrasound characteristics of foot and ankle structures in healthy, coper, and chronically unstable ankles (2018)
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Abdeen, R., Comfort, P., Starbuck, C., & Nester, C. (2018). Ultrasound characteristics of foot and ankle structures in healthy, coper, and chronically unstable ankles. Journal of Ultrasound in Medicine, 38(4), 917-926. https://doi.org/10.1002/jum.14770

Objective: Ankle sprains constitute approximately 85% of all ankle injuries and up to 70% of people experience residual symptoms. Whilst the injury to ligaments is well understood the potential role of other foot and ankle structures has not been exp... Read More about Ultrasound characteristics of foot and ankle structures in healthy, coper, and chronically unstable ankles.

Relationships between unilateral muscle strength qualities and change of direction in adolescent team-sport athletes (2018)
Journal Article
Thomas, C., Dos'Santos, T., Comfort, P., & Jones, P. (2018). Relationships between unilateral muscle strength qualities and change of direction in adolescent team-sport athletes. Sports, 6(3), 83. https://doi.org/10.3390/sports6030083

Previous studies have reported an association between global measures of bilateral strength and change of direction (COD) ability. Yet, little is known about the association between unilateral muscle strength qualities and COD ability. The aim of thi... Read More about Relationships between unilateral muscle strength qualities and change of direction in adolescent team-sport athletes.

Average of trial peaks versus peak of average profile : impact on change of direction biomechanics (2018)
Journal Article
Dos'Santos, T., Comfort, P., & Jones, P. (2020). Average of trial peaks versus peak of average profile : impact on change of direction biomechanics. Sports Biomechanics, 19(4), 483-492. https://doi.org/10.1080/14763141.2018.1497197

The aims of this study were twofold: firstly, to compare lower limb kinematic and kinetic variables during a sprint and 90° cutting task between two averaging methods of obtaining discrete data (peak of average profile vs. average of individual trial... Read More about Average of trial peaks versus peak of average profile : impact on change of direction biomechanics.

Quadriceps Strength and Functional Performance After Anterior Cruciate Ligament Reconstruction in Professional Soccer players at Time of Return to Sport (2018)
Journal Article
Herrington, L., Hussain, G., & Comfort, P. (2021). Quadriceps Strength and Functional Performance After Anterior Cruciate Ligament Reconstruction in Professional Soccer players at Time of Return to Sport. Journal of Strength and Conditioning Research, 35(3), 769-775. https://doi.org/10.1519/jsc.0000000000002749

Poor quadriceps strength has been associated with poor outcome after anterior cruciate ligament (ACL) reconstruction (ACLR). This study aims to assess quadriceps strength, muscle inhibition, and hop test performance in professional soccer players aft... Read More about Quadriceps Strength and Functional Performance After Anterior Cruciate Ligament Reconstruction in Professional Soccer players at Time of Return to Sport.

Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified (2018)
Journal Article
McMahon, J., Lake, J., & Comfort, P. (2018). Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified. Sports, 6(3), 81. https://doi.org/10.3390/sports6030081

Countermovement jump (CMJ) force-time testing is commonly used to monitor seasonal alterations in athletes’ CMJ strategy (to infer alterations in neuromuscular function). The flight time to contraction time (FT:CT) ratio and reactive strength index m... Read More about Reliability of and relationship between flight time to contraction time ratio and reactive strength index modified.

The effect of angle and velocity on change of direction biomechanics : an angle-velocity trade-off (2018)
Journal Article
Dos'Santos, T., Thomas, C., Comfort, P., & Jones, P. (2018). The effect of angle and velocity on change of direction biomechanics : an angle-velocity trade-off. Sports Medicine, 48(10), 2235-2253. https://doi.org/10.1007/s40279-018-0968-3

Changes of direction (CODs) are key manoeuvres linked to decisive moments in sport and are also key actions associated with lower limb injuries. During sport athletes perform a diverse range of CODs, from various approach velocities and angles, thus... Read More about The effect of angle and velocity on change of direction biomechanics : an angle-velocity trade-off.

Assessing the frequency and magnitude of match impacts accrued during an elite rugby union playing season (2018)
Journal Article
Grainger, A., McMahon, J., & Comfort, P. (2018). Assessing the frequency and magnitude of match impacts accrued during an elite rugby union playing season. International Journal of Performance Analysis in Sport, 18(4), 507-522. https://doi.org/10.1080/24748668.2018.1496392

The aim of this study was to identify position-related differences in absolute and relative match impacts in rugby union. Thirty-eight subjects were tracked, using GPS units containing inertial sensors, across one full playing season (n = 462 data se... Read More about Assessing the frequency and magnitude of match impacts accrued during an elite rugby union playing season.

Barriers to the prescription of psychological strategies by strength and conditioning specialists (2018)
Journal Article
Radcliffe, J., Comfort, P., & Fawcett, T. (2018). Barriers to the prescription of psychological strategies by strength and conditioning specialists. Journal of Strength and Conditioning Research, 32(7), 1948-1959. https://doi.org/10.1519/JSC.0000000000002101

The purpose of this article was to explore the barriers to strength and conditioning coaches integrating psychological strategies within the strength and conditioning practice. The sample of accredited strength and conditioning coaches comprised 10 s... Read More about Barriers to the prescription of psychological strategies by strength and conditioning specialists.

An investigation into the effects of excluding the catch phase of the power clean on force-time characteristics during isometric and dynamic tasks (2018)
Journal Article
Comfort, P., Dos'Santos, T., Thomas, C., McMahon, J., & Suchomel, T. (2018). An investigation into the effects of excluding the catch phase of the power clean on force-time characteristics during isometric and dynamic tasks. Journal of Strength and Conditioning Research, 32(8), 2116-2129. https://doi.org/10.1519/JSC.0000000000002656

The aims of this study were to compare the effects of the exclusion or inclusion of the catch phase during power clean (PC) derivatives on force-time characteristics during isometric and dynamic tasks, after two 4-week mesocycles of resistance traini... Read More about An investigation into the effects of excluding the catch phase of the power clean on force-time characteristics during isometric and dynamic tasks.

Concurrent validity of a portable force plate using vertical jump force-time characteristics (2018)
Journal Article
Lake, J., Mundy, P., Comfort, P., McMahon, J., Suchomel, T., & Carden, P. (2018). Concurrent validity of a portable force plate using vertical jump force-time characteristics. Journal of Applied Biomechanics, 34(5), 410-413. https://doi.org/10.1123/jab.2017-0371

This study examined concurrent validity of countermovement vertical jump (CMJ) reactive strength index modified and force-time characteristics recorded using a one dimensional portable and laboratory force plate system. Twenty-eight men performed bil... Read More about Concurrent validity of a portable force plate using vertical jump force-time characteristics.

Do the peak and mean force methods of assessing vertical jump force asymmetry agree? (2018)
Journal Article
Lake, J., Mundy, P., Comfort, P., & Suchomel, T. (2020). Do the peak and mean force methods of assessing vertical jump force asymmetry agree?. Sports Biomechanics, 19(2), 227-234. https://doi.org/10.1080/14763141.2018.1465116

The aim of this study was to assess agreement between peak and mean force methods of quantifying force asymmetry during the countermovement jump (CMJ). Forty-five men performed four CMJ with each foot on one of two force plates recording at 1000 Hz... Read More about Do the peak and mean force methods of assessing vertical jump force asymmetry agree?.

The impact of power clean ability and training age on adaptations to weightlifting-style training (2018)
Journal Article
James, L., Comfort, P., Suchomel, T., Kelly, V., Beckman, E., & Haff, G. (2019). The impact of power clean ability and training age on adaptations to weightlifting-style training. Journal of Strength and Conditioning Research, 33(11), 2936-2944. https://doi.org/10.1519/JSC.0000000000002534

The purpose of this investigation was to determine whether weightlifting actions are a viable method for improving athletic performance amongst weaker, inexperienced lifters when compared to individuals with a greater power clean result, and hence we... Read More about The impact of power clean ability and training age on adaptations to weightlifting-style training.

Effect of Barbell Load on Vertical Jump Landing Force-Time Characteristics (2018)
Journal Article
Lake, J. P., Mundy, P. D., Comfort, P., McMahon, J. J., Suchomel, T. J., & Carden, P. (2023). Effect of Barbell Load on Vertical Jump Landing Force-Time Characteristics. Journal of Strength and Conditioning Research, 35(1), 25-32. https://doi.org/10.1519/jsc.0000000000002554

The aim of this study was to quantify the effect that barbell load has on the jump height and force-time characteristics of the countermovement jump (CMJ). Fifteen strength-trained men (mean ± SD: age 23 ± 2 years, mass 84.9 ± 8.1 kg, height 1.80 ± 0... Read More about Effect of Barbell Load on Vertical Jump Landing Force-Time Characteristics.

Asymmetries in isometric force-time characteristics are not detrimental to change of direction speed (2018)
Journal Article
Dos'Santos, T., Thomas, C., Jones, P., & Comfort, P. (2018). Asymmetries in isometric force-time characteristics are not detrimental to change of direction speed. Journal of Strength and Conditioning Research, 32(2), 520-527. https://doi.org/10.1519/JSC.0000000000002327

The purpose of this study was to determine the impact of between-limb asymmetries in isometric midthigh pull (IMTP) force-time characteristics on change of direction speed (CODS). Twenty multisport collegiate athletes (mean ± SD: age: 21.0 ± 1.9 year... Read More about Asymmetries in isometric force-time characteristics are not detrimental to change of direction speed.

Relationship Between Reactive Strength Index Variants in Rugby League Players (2018)
Journal Article
McMahon, J. J., Suchomel, T. J., Lake, J. P., & Comfort, P. (2023). Relationship Between Reactive Strength Index Variants in Rugby League Players. Journal of Strength and Conditioning Research, 35(1), 280-285. https://doi.org/10.1519/jsc.0000000000002462

Two reactive strength index (RSI) variants exist, the RSI and RSI modified (RSImod) which are typically calculated during the drop jump (DJ) and countermovement jump (CMJ), respectively. Both RSI variants have been used to monitor athletes’ ability t... Read More about Relationship Between Reactive Strength Index Variants in Rugby League Players.

Understanding the key phases of the countermovement jump force-time curve (2018)
Journal Article
McMahon, J., Suchomel, T., Lake, J., & Comfort, P. (2018). Understanding the key phases of the countermovement jump force-time curve. Strength and Conditioning Journal, 40(4), 96-106. https://doi.org/10.1519/SSC.0000000000000375

The countermovement jump (CMJ) test is commonly conducted to assess neuromuscular function and is being increasingly performed using force platforms. Comprehensive insight into athletes’ neuromuscular function can be gained through detailed analys... Read More about Understanding the key phases of the countermovement jump force-time curve.

Effect of low-pass filtering on isometric midthigh pull kinetics (2018)
Journal Article
Dos'Santos, T., Lake, J., Jones, P., & Comfort, P. (2018). Effect of low-pass filtering on isometric midthigh pull kinetics. Journal of Strength and Conditioning Research, 32(4), 983-989. https://doi.org/10.1519/JSC.0000000000002473

The purpose of this study was to investigate the effect of low-pass filtering on isometric mid-thigh pull (IMTP) kinetics, including body weight (BW), onset threshold force, time-specific force values (50, 100, 150 and 200 ms) and peak force (PF). Fo... Read More about Effect of low-pass filtering on isometric midthigh pull kinetics.

Assessing asymmetries in change of direction speed performance; application of change of direction deficit (2018)
Journal Article
Dos'Santos, T., Thomas, C., Jones, P., & Comfort, P. (2019). Assessing asymmetries in change of direction speed performance; application of change of direction deficit. Journal of Strength and Conditioning Research, 33(11), 2953-2961. https://doi.org/10.1519/JSC.0000000000002438

The aims of this study were to quantify asymmetries in change of direction (COD) performance via completion time and COD deficit, and determine its influence on asymmetry profiling of COD ability. A secondary aim was to evaluate the relationship betw... Read More about Assessing asymmetries in change of direction speed performance; application of change of direction deficit.

Comparison of the force-, velocity- and power-time curves between the concentric-only and eccentric-concentric bench press exercises (2018)
Journal Article
Pérez-Castilla, A., Comfort, P., McMahon, J., Pestaña-Melero, F., & García-Ramos, A. (2020). Comparison of the force-, velocity- and power-time curves between the concentric-only and eccentric-concentric bench press exercises. Journal of Strength and Conditioning Research, 34(6), 1618-1624. https://doi.org/10.1519/JSC.0000000000002448

The aim of this study was to compare the temporal and mechanical variables between the concentric-only and eccentric-concentric bench press (BP) variants. Twenty-one men (age: 22.0±4.2 years, body mass: 73.4±7.7 kg, height: 177.2±8.0 cm; one-repetiti... Read More about Comparison of the force-, velocity- and power-time curves between the concentric-only and eccentric-concentric bench press exercises.

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