Jason Lake

Jason Lake
University of Chichester · Institute of Sport Nursing and Allied Health

BSc, MSc, PhD

About

100
Publications
219,064
Reads
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1,671
Citations
Additional affiliations
November 2009 - September 2017
University of Chichester
Position
  • Reader in Sports Biomechanics
November 2009 - September 2017
University of Chichester
Position
  • Reader in Sport and Exercise Biomechanics
Education
May 2007 - August 2010
University of Chichester
Field of study
  • Sport and Exercise Biomechanics
September 2004 - August 2006
University of Chichester
Field of study
  • Sport and Exercise Biomechanics
September 2001 - September 2004
University of Chichester
Field of study
  • Sport and Exercise Science

Publications

Publications (100)
Article
Full-text available
Force plates are commonly used when assessing vertical jumping performance but are not always affordable or practical tools for all testing situations. Twenty-four participants volunteered to take part in a study investigating the agreement between bilateral force plates and a new commercially available contact mat that records jump height, flight-...
Article
Full-text available
The countermovement jump (CMJ) has been suggested to be an important test of neuromuscular performance for rugby league (RL) players. Identifying force platform-derived CMJ variables that may be more applicable to RL positions (e.g., forwards and backs) has yet to be fully explored in the scientific literature. The aim of this study was to identify...
Article
Full-text available
The study aim was to compare kinetics and kinematics of two, lower-body free-weight exercises, calculated from concentric and propulsion sub-phases, across multiple loads. Sixteen strength trained men performed back squat one-repetition maximum tests (1RM) (visit 1), followed by two incremental back squat and jump squat protocols (visit 2) (loads =...
Article
This study aimed to compare the kinetics between the push press (PP), push jerk (PJ), and split jerk (SJ). Sixteen resistance-trained participants (12 men and 4 women; age: 23.8 ± 4.4 years; height: 1.7 ± 0.1 m; body mass: 75.7 ± 13.0 kg; weightlifting experience: 2.2 ± 1.3 years; one repetition maximum [1RM] PP: 76.5 ± 19.5 kg) performed 3 repetit...
Article
Full-text available
Background If interplanetary travel is to be successful over the coming decades, it is essential that countermeasures to minimize deterioration of the musculoskeletal system are as effective as possible, given the increased duration of spaceflight associated with such missions. The aim of this review, therefore, is to determine the magnitude of dec...
Article
The aim of this study was to assess the agreement of three different automated methods of identifying force-onset (40 N, 5 SDs, and 3 SDs) with manual identification, during the isometric mid-thigh pull (IMTP). Fourteen resistance-trained participants with >6 months experience training with the power clean volunteered to take part. After three fami...
Article
Researchers and practitioners have highlighted the necessity to monitor jump strategy metrics as well as the commonly reported outcome measures during the countermovement (CMJ) and drop jump (DJ) tests. However, there is a risk of confusion for practitioners, given the vast range of metrics that now seem to be on offer via analysis software when co...
Article
Full-text available
The drop jump (DJ) is commonly utilised to assess athletes. The criterion two force platform (2FP) method of assessing DJ performance involves two adjacent force platforms, one for the box and one for the athlete to rebound from. Most researchers and practitioners only have access to one force platform (1FP) and they rarely account for the often co...
Article
Dependent variables commonly studied during countermovement vertical jump (CMVJ) tests largely stem from male-only studies despite females' distinct energy storage and reutilisation strategies. This could limit progress among females seeking increased CMVJ performance through targeted changes in certain variables. We explored relationships between...
Article
Kotani, Y, Lake, J, Guppy, SN, Poon, W, Nosaka, K, Hori, N, and Haff, GG. The reliability of the squat jump force-velocity and load-velocity profiles. J Strength Cond Res XX(X): 000-000, 2021-The purpose of this study was to investigate the between-session reliability of the squat jump force-velocity (FV) and load-velocity (LV) profiles. Eighteen s...
Article
Full-text available
The countermovement jump (CMJ) is considered an important test in rugby league, and the force platform is the recommended tool for assessing CMJ performance in this cohort. Because of inconsistent methods applied across previous studies, there is currently a lack of understanding of what constitutes a “good” CMJ performance, with respect to the typ...
Poster
Full-text available
PURPOSE: The purpose of this study was to assess the concurrent validity of a portable jump mat that measures flight-time for individual legs as well as overall flight-time against those calculated using bilateral, in-ground force plates during countermovement (CMJ) and squat jumps (SJ). METHODS: Sixteen healthy subjects (age: 27.67  4.32 years, h...
Article
Full-text available
The purpose of this study was to determine the usefulness of calculating jump take-off momentum in rugby league (RL), by exploring its relationship with sprint momentum, due to the latter being an important attribute to this sport. Twenty-five male RL players performed three maximal-effort countermovement jumps (CMJs) on a force platform and three...
Article
The assessment of the mechanical power production is of great importance for researchers and practitioners. The purpose of this review was to compare the differences in ground reaction force (GRF), kinematic, and combined (bar velocity x GRF) methods to assess mechanical power production during weightlifting exercises. A search of electronic databa...
Article
The aims of the present study were to compare the magnitude and direction of asymmetry in comparable bilateral and unilateral countermovement jumps (CMJ). Forty-five elite academy soccer players from under-23 (n = 15), under-18 (n = 16) and under-16 (n = 14) age groups performed bilateral and unilateral CMJ as part of their routine pre-season fitne...
Article
Full-text available
The aim of the present study was to determine the association of multi-directional jumping asymmetries with measures of physical performance. Forty-two youth handball athletes (age: 16.0 ± 1.3 years; body height: 174.11 ± 7.3 cm; body mass: 70.49 ± 13.3 kg) performed a mid-season fitness test battery consisting of single leg countermovement, latera...
Article
The aim of this study was to assess the reliability and validity of the bar-mounted PUSH BandTM 2.0 to determine peak and mean velocity during the bench press exercise with a moderate (60% one repetition maximum [1RM]) and heavy (90% 1RM) load. We did this by simultaneously recording peak and mean velocity using the PUSH BandTM 2.0 and three-dimens...
Article
Full-text available
Understanding force generating capabilities of athletes is an important facet of strength diagnostics. The utilisation of isometric tasks such as the isometric squat and isometric mid-thigh pull are therefore popular methods used to gain a deeper understanding of as to what strength characteristics have changed over a given period. This article aim...
Article
Full-text available
Biomechanics principally stems from two disciplines, mechanics and biology. However, both the application and language of the mechanical constructs are not always adhered to when applied to biological systems, which can lead to errors and misunderstandings within the scientific literature. Here we address three topics that seem to be common points...
Article
The aim of the present study was to investigate the effects of multiple repeated sprints on unilateral jump performance and inter-limb asymmetries. Eighteen recreationally active males performed three single leg countermovement jumps (SLCMJ) as baseline data. The repeated sprint protocol was 6 x 40 m with 20 seconds of passive rest between each spr...
Article
Full-text available
Studies that examine the effects of inter-limb asymmetry on measures of physical performance are scarce, especially in adult female populations. The aim of the present study was to establish the relationship between inter-limb asymmetry and speed and change-of-direction speed (CODS) in adult female soccer players. Sixteen adult players performed a...
Article
Research to date has investigated the phenomenon of the bilateral deficit (BLD); however, limited research exists on its association with measures of athletic performance. The purpose of the present study was to investigate the magnitude of the BLD and examine its relationship with linear speed and change of direction speed (CODS) performance. Eigh...
Article
The aim of the present study was to determine test reliability, establish inter-limb asymmetries and their associations with force production capability on the dominant (D) and non-dominant (ND) limbs during the unilateral isometric squat test. Twenty-eight recreational sport athletes attended a single test session after familiarization and perform...
Article
Full-text available
The aim of the present study was to establish inter-limb asymmetries across different age groups in elite academy male soccer players and to examine any relationships between asymmetry and measures of physical performance. Fifty-one players from an English Premier League soccer academy were split into under-23 (n = 21), under-18 (n = 14) and under-...
Article
Full-text available
Countermovement jump (CMJ) force data are often time-normalized so researchers and practitioners can study the effect that sex, training status, and training intervention have on CMJ strategy: the so-called force–time curve shape. Data are often collected on an individual basis and then averaged across interest-groups. However, little is known abou...
Article
Full-text available
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 of this study was to assess the agreement between peak and mean velocity and power obtained from th...
Article
The purpose of the present study was to investigate the effects of a competitive soccer match on jump performance and inter-limb asymmetries over incremental time points during a 72-hour (h) period. Fourteen elite adolescent players from a professional English category three academy performed single leg countermovement jumps (SLCMJ) pre, post, 24,...
Article
Full-text available
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 modified (RSImod) are considered to be two primary CMJ variables of interest. Due to similar calculat...
Article
The dynamic strength index (DSI) provides a ratio of the peak force an athlete can produce in both isometric and ballistic tasks. While the DSI measured during bilateral tests has been examined, unilateral DSI scores have not been reported to date and thus was the aim of the present study. Twenty-eight recreational sport athletes performed three tr...
Article
Morris, RO, Jones, B, Myers, T, Lake, J, Emmonds, S, Clarke, ND, Singleton, D, Ellis, M, and Till, K. Isometric midthigh pull characteristics in elite youth male soccer players: Comparisons by age and maturity offset. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to (a) provide comparative isometric midthigh pull (IMTP) for...
Article
Full-text available
Renals, L, Lake, J, Keogh, J, and Austin, K. Strongman log push press: The effect log diameter has on force-time characteristics. J Strength Cond Res XX(X): 000-000, 2018-Strongman training is becoming more common in strength and conditioning practices, particularly the log press. The existing literature analyzes force characteristics of the log cl...
Article
It has been shown that the magnitude of inter-limb asymmetries varies depending on the test selected; however, literature relating to whether asymmetries always favour the same limb is scarce. The aim of the present study was to determine whether inter-limb asymmetries always favoured the same side for common metrics across unilateral strength and...
Article
Full-text available
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 bilateral CMJs on two portable force plates placed on top of two in-ground force plates, both recording...
Article
Full-text available
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 1,000 Hz. Peak and mean were obtained from both sides during the braking and propulsion phases. The dominant...
Preprint
Full-text available
In theory, everything in biomechanics stems from two disciplines, physics and biology. While a number of papers, editorials, letters to the editor, and even a review have addressed the misapplication of mechanical principles, the misapplication of the basic principles of physics in the field of biomechanics continues. There are three principles, sp...
Article
Full-text available
Purpose: Longitudinal studies assessing the seasonal development of strength, speed and power qualities are limited in youth soccer players. The purpose of this study was to evaluate the seasonal changes in the physical development of elite youth soccer players across Pre-, Circa- and Post-Peak Height Velocity (PHV), against a similar age and matur...
Article
Full-text available
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 to complete stretch-shortening cycle actions quickly, but they have never been compared. The purpose...
Article
Full-text available
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 strengthtrained men (mean ± SD: age 23 ± 2 years, mass 84.9 ± 8.1 kg, height 1.80 ± 0.05 m) performed three CMJ with no additional load, and with barbell loads of 25%, 50%, 75%, and 100%...
Article
Full-text available
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). Forty IMTP trials from twenty-four collegiate athletes (age: 21.2 ± 1.8 years, height: 1.72 ± 0.09 m,...
Article
Full-text available
Inter-limb asymmetries have been a popular topic of investigation in the strength and conditioning literature. Recently, numerous equations have been highlighted that can quantify these between-limb differences. However, no distinction was provided on whether their use was applicable to both bilateral and unilateral tests. This article provides a f...
Article
Full-text available
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 analyses of force-time curves throughout specific phases of the CMJ, beyond jump height alone. Confusingly, h...
Article
Full-text available
Increased popularity in the utilization of force plates to measure countermovement jumps (CMJS) for performance monitoring warrants the need for strength and conditioning coaches and sport scientists to better understand its force-time characteristics and the calculation of its associated variables. This article aims to provide information on how t...
Article
Full-text available
This study compared typical mechanical variables of interest obtained directly from barbell motion during deadlift performance with a conventional (CBD) and a hexagonal barbell (HBD). Eleven men, proficient with both deadlift variations, volunteered to participate in the study (age: 20.3 ± 0.6 years; height: 175.5 ± 8.5 m; mass: 88.7 ± 19.0 kg; CBD...
Article
Full-text available
The aim of this study was to compare the actual deadlift one repetition maximum (1RM) and the deadlift 1RM predicted from individualised load-velocity profiles. Twelve moderately resistance-trained men participated in three deadlift sessions. During the first, 1RM was assessed; during the second, load-velocity profiles were recorded with six loads...
Poster
Full-text available
Poster presented at the 13th Annual Conference of the United Kingdom Strength and Conditioning Association
Conference Paper
Full-text available
RESULTS The review process and its results, and the results of the method comparison are shown in Figure 2. From 1236 studies, only 129 explained how they identified key transitions; 35 identified the start (13 methods), 54 identified different phases (5 methods), 92 identified takeoff (14 methods). Criterion methods were chosen based on their abil...
Conference Paper
Full-text available
METHODS Twenty-one men (age: 20 ± 0.8 years, body mass: 82.5 ± 7.2 kg, height: 1.80 ± 0.56 m) performed four CMJs on two portable force plates (PASPORT force plate, PS-2141, PASCO Scientific, California, USA) placed on top of in-ground force plates (Kistler Type 9281, Kistler Instruments, Hampshire, UK). Both force plate systems recorded vertical g...
Article
Full-text available
Purpose: The reactive strength index modified (RSImod) has been recently identified and validated as a method of monitoring countermovement jump (CMJ) performance. The kinetic and kinematic mechanisms that optimize a higher RSImod score are, however, currently unknown. The purpose of this study, therefore, was to compare entire CMJ force-, power-,...
Article
Full-text available
WEIGHTLIFTING MOVEMENTS AND THEIR DERIVATIVES MAY BE IMPLEMENTED IN A SEQUENCED PROGRESSION THROUGHOUT THE TRAINING YEAR TO OPTIMIZE THE DEVELOPMENT OF AN ATHLETE’S STRENGTH, RATE OF FORCE DEVELOPMENT, AND POWER OUTPUT. WEIGHTLIFTING MOVEMENTS AND THEIR DERIVATIVES CAN BE PROGRAMMED EFFECTIVELY BY CONSIDERING THEIR FORCE–VELOCITY CHARACTERISTICS AN...
Conference Paper
Full-text available
Introduction Method Results Recently, the isometric mid-­‐thigh pull (IMTP) has been used to assess strength and force-­‐time characteristics in college athletes [1]. However, to date no research study has used the IMTP to assess strength in elite youth soccer players aged 12-­‐18 years. The aims of this study were to: 1) provide normative IMTP dat...
Conference Paper
Full-text available
The association between isometric mid-thigh pull (IMTP) and dynamic performance is not a novel concept [1]. However, it has not been used to investigate youth populations and maturation. The aim of this study was to investigate the relationship between IMTP strength and dynamic performance whilst considering maturation status. Following institution...
Article
Full-text available
The aim of this study was to compare load-absorption force-time characteristics of the clean from the knee (CK), power clean from the knee (PCK) and clean pull from the knee (CPK). Ten collegiate athletes (age 27.5 +/- 4.2 years; height 180.4 +/- 6.7 cm; mass 84.4 +/- 7.8 kg), performed three repetitions each of the CK, PCK and CPK with 90% of thei...
Article
The aim of this study was to examine the effects of barbell load on countermovement vertical jump (CMJ) power and net impulse within a theoretically valid framework, cognisant of the underpinning force, temporal, and spatial components. A total of 24 resistance-trained rugby union athletes (average ± SD: age: 23.1 ± 3.4 years; height: 1.83 ± 0.05 m...