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Mr John McMahon's Outputs (106)

The validity of the Push Band 2.0 during vertical jump performance (2018)
Journal Article
Lake, J., Augustus, S., Austin, K., Mundy, P., McMahon, J., Comfort, P., & Haff, G. (2018). The validity of the Push Band 2.0 during vertical jump performance. Sports, 6(4), 140. https://doi.org/10.3390/sports6040140

The Push Band has the potential to provide a cheap and practical method of measuring velocity and power during countermovement vertical jumping (CMJ). However, very little is known about whether it conforms to laboratory-based gold standards. The aim... Read More about The validity of the Push Band 2.0 during vertical jump performance.

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.

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.

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.

Variability of plyometric and ballistic exercise technique maintains jump performance (2018)
Journal Article
Chandler, P., Greig, M., & McMahon, J. (2018). Variability of plyometric and ballistic exercise technique maintains jump performance. Journal of Strength and Conditioning Research, 32(6), 1571-1582. https://doi.org/10.1519/JSC.0000000000002572

The aim of this study was to investigate changes in vertical jump technique over the course of a training session. Twelve plyometric and ballistic exercise trained male athletes (age = 23.4 ± 4.6 years, body mass = 78.7 ± 18.8 kg, height = 177.1 ± 9.... Read More about Variability of plyometric and ballistic exercise technique maintains jump performance.

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.

Lack of effect of ankle position during the Nordic curl on muscle activity of the biceps femoris and medial gastrocnemius (2017)
Journal Article
Comfort, P., Regan, A., Herrington, L., Thomas, C., McMahon, J., & Jones, P. (2017). Lack of effect of ankle position during the Nordic curl on muscle activity of the biceps femoris and medial gastrocnemius. Journal of Sport Rehabilitation, 26(3), 202-207. https://doi.org/10.1123/jsr.2015-0130

Context:
Regular performance (~2×/wk) of Nordic curls has been shown to increase hamstring strength and reduce the risk of hamstring strain injury, although no consensus on ankle position has been provided.

Objective:
To compare the effects of p... Read More about Lack of effect of ankle position during the Nordic curl on muscle activity of the biceps femoris and medial gastrocnemius.

The effects of a four week jump-training program on frontal plane projection angle in female gymnasts (2017)
Journal Article
Colclough, A., Munro, A., Herrington, L., McMahon, J., & Comfort, P. (2018). The effects of a four week jump-training program on frontal plane projection angle in female gymnasts. Physical Therapy in Sport, 30, 29-33. https://doi.org/10.1016/j.ptsp.2017.11.003

Objectives: To investigate the effects of a four week jump training program on frontal plane projection angle (FPPA) in young female gymnasts.
Design: Intervention study, consisting of a four week jump training program performed for 15 minutes as... Read More about The effects of a four week jump-training program on frontal plane projection angle in female gymnasts.

Returners exhibit greater jumping performance improvements during a peaking phase compared to new players on a volleyball team (2017)
Journal Article
Bazyler, C., Mizuguchi, S., Kavanaugh, A., McMahon, J., Comfort, P., & Stone, M. (2017). Returners exhibit greater jumping performance improvements during a peaking phase compared to new players on a volleyball team. International Journal of Sports Physiology and Performance, 13(6), 709-716. https://doi.org/10.1123/ijspp.2017-0474

Purpose: To determine if jumping performance changes during a peaking phase differed between returners and new players in a female collegiate volleyball team and to determine which variables best explained the variation in performance changes. Metho... Read More about Returners exhibit greater jumping performance improvements during a peaking phase compared to new players on a volleyball team.

The effect of hip joint angle on isometric midthigh pull kinetics (2017)
Journal Article
Dos'Santos, T., Thomas, C., Jones, P., McMahon, J., & Comfort, P. (2017). The effect of hip joint angle on isometric midthigh pull kinetics. Journal of Strength and Conditioning Research, 31(10), 2748-2757. https://doi.org/10.1519/JSC.0000000000002098

The aim of this study were to compare isometric midthigh pull (IMTP) peak force (PF), time-specific force values (100-, 150-, and 200 ms), rate of force development (RFD) at predetermined time bands (0–100, 0–150, and 0–200 ms) and net forces between... Read More about The effect of hip joint angle on isometric midthigh pull kinetics.

Influence of dynamic strength index on countermovement jump force-, power-, velocity-, and displacement-time curves (2017)
Journal Article
McMahon, J., Jones, P., Dos'Santos, T., & Comfort, P. (2017). Influence of dynamic strength index on countermovement jump force-, power-, velocity-, and displacement-time curves. Sports, 5(4), 72-83. https://doi.org/10.3390/sports5040072

The dynamic strength index (DSI), often calculated as the ratio of countermovement jump (CMJ) propulsion peak force to isometric mid-thigh pull (IMTP) peak force, is said to inform whether ballistic or maximal strength training is warranted for a giv... Read More about Influence of dynamic strength index on countermovement jump force-, power-, velocity-, and displacement-time curves.

Relationships between isometric force-time characteristics and dynamic performance (2017)
Journal Article
Dos'Santos, T., Thomas, C., Comfort, P., McMahon, J., & Jones, P. (2017). Relationships between isometric force-time characteristics and dynamic performance. Sports, 5(3), https://doi.org/10.3390/sports5030068

The purpose of this study was to explore the relationships between isometric mid-thigh pull (IMTP) force-time characteristics (peak force and time-specific force vales (100–250 ms)) and dynamic performance and compare dynamic performance between stro... Read More about Relationships between isometric force-time characteristics and dynamic performance.

Comment on : "Anthropometric and physical qualities of elite male youth rugby league players" (2017)
Journal Article
McMahon, J., Jones, P., & Comfort, P. (2017). Comment on : "Anthropometric and physical qualities of elite male youth rugby league players". Sports Medicine, 47(12), 2667-2668. https://doi.org/10.1007/s40279-017-0771-6

We read with interest the recent review on anthropometric and physical qualities of elite male youth rugby league players by Till et al. and congratulate the authors for producing a very informative review. However, we would like to raise an issue th... Read More about Comment on : "Anthropometric and physical qualities of elite male youth rugby league players".

Assessment of loaded squat jump height with a free-weight barbell and Smith machine : comparison of the take-off velocity and flight time procedures (2017)
Journal Article
Pérez-Castilla, A., McMahon, J., Comfort, P., & García-Ramos, A. (2020). Assessment of loaded squat jump height with a free-weight barbell and Smith machine : comparison of the take-off velocity and flight time procedures. Journal of Strength and Conditioning Research, 34(3), 671-677. https://doi.org/10.1519/JSC.0000000000002166

The aims of this study were to compare the reliability and magnitude of jump height between the two standard procedures of analysing force platform data to estimate jump height (take-off velocity [TOV] and flight time [FT]) in the loaded squat jump (... Read More about Assessment of loaded squat jump height with a free-weight barbell and Smith machine : comparison of the take-off velocity and flight time procedures.

Comparison of methods of calculating dynamic strength index (2017)
Journal Article
Comfort, P., Thomas, C., Dos'Santos, T., Jones, P., Suchomel, T., & McMahon, J. (2017). Comparison of methods of calculating dynamic strength index. International Journal of Sports Physiology and Performance, 13(3), 320-325. https://doi.org/10.1123/ijspp.2017-0255

Purpose: To determine the reliability and variability of dynamic strength index (DSI) calculated from squat jump (SJ) (DSI-SJ) versus countermovement jump (CMJ) (DSI-CMJ) peak force (PF) and to compare DSI values between methods. Methods: Male youth... Read More about Comparison of methods of calculating dynamic strength index.

Countermovement jump phase characteristics of senior and academy rugby league players (2017)
Journal Article
McMahon, J., Murphy, S., Rej, S., & Comfort, P. (2017). Countermovement jump phase characteristics of senior and academy rugby league players. International Journal of Sports Physiology and Performance, 12(6), 803-811. https://doi.org/10.1123/ijspp.2016-0467

Purpose:

Gross measures of countermovement jump (CMJ) performance are commonly used to track maturational changes in neuromuscular function within rugby league (RL). The purpose of this study was to conduct both a gross and a more detailed tempor... Read More about Countermovement jump phase characteristics of senior and academy rugby league players.