John H Challis
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Explore the profile of John H Challis including associated specialties, affiliations and a list of published articles.
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Recent Articles
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Masters S, Challis J
J Biomech
. 2021 Jun;
123:110527.
PMID: 34077770
Human running can be simulated using a simple model called the spring-loaded inverted pendulum (SLIP). The SLIP model predicts some aspects of running including the self-stabilizing properties of running. In...
13.
Davis D, Challis J
J Appl Biomech
. 2021 Mar;
37(3):272-276.
PMID: 33690167
Time-differentiating kinematic signals from optical motion capture amplifies the inherent noise content of those signals. Commonly, biomechanists address this problem by applying a Butterworth filter with the same cutoff frequency...
14.
Challis J
J Biomech Eng
. 2021 Jan;
143(5).
PMID: 33454726
To examine segment and joint attitudes when using image-based motion capture, it is necessary to determine the rigid body transformation parameters from an inertial reference frame to a reference frame...
15.
Masters S, Challis J
Bioinspir Biomim
. 2020 Dec;
16(2).
PMID: 33352541
Humans are made up of mostly soft tissue that vibrates during locomotion. This vibration has been shown to store and dissipate energy during locomotion. However, the effects of soft tissue...
16.
Challis J
BMC Biomed Eng
. 2020 Sep;
2:5.
PMID: 32903359
The three-dimensional description of rigid body kinematics is a key step in many studies in biomechanics. There are several options for describing rigid body orientation including Cardan angles, Euler angles,...
17.
Pataky T, Challis J
J Biomech
. 2020 Aug;
111:109976.
PMID: 32858430
Rigid body attitude and single-joint kinematics are typically expressed using three Cardan angles which represent rotations in anatomical planes. It was recently shown in the Biomechanics literature that Cardan angles...
18.
Davis D, Challis J
J Biomech
. 2020 Jan;
101:109619.
PMID: 31952818
Computing time derivatives is a frequent stage in the processing of biomechanical data. Unfortunately, differentiation amplifies the high frequency noise inherent within the signal hampering the accuracy of signal derivatives....
19.
Challis J
J Biomech
. 2019 Nov;
98:109492.
PMID: 31733819
Three-dimensional angular kinematics exist on the surface of a unit hypersphere, therefore the average attitude cannot always be accurately computed by averaging Cardan angles. This study derives and evaluates a...
20.
Infantolino B, Forrester S, Pain M, Challis J
Comput Methods Biomech Biomed Engin
. 2019 May;
22(12):997-1008.
PMID: 31107114
The study examined the sensitivity of two musculoskeletal models to the parameters describing each model. Two different models were examined: a phenomenological model of human jumping with parameters based on...