Strategies for Effective Collaboration with Middle School Physical Education Teachers: An Application of School-Engaged Research.

Background: Increasing the capacity of teachers to deliver physical education (PE) lessons that are high in moderate to vigorous physical activity (PA) is one strategy to increase the amount of exercise students receive during school. However, traditional research approaches have not directly engaged the school community as equitable partners in the intervention design process. The purpose of this article is to describe the process, outputs, and lessons learned from a school-engaged research study, which incorporates the unique needs of schools-in terms of structure, accountability measures, and array of stakeholders into the research process and design.

Is there a low-back cost to hip-centric exercise? Quantifying the lumbar spine joint compression and shear forces during movements used to overload the hips.

The aim of this study was to quantify joint compression and shear forces at L4/L5 during exercises used to overload the hips. Nine men performed 36 "walking" trials using two modalities: (1) sled towing and (2) exercise bands placed around the ankles. Participants completed forward, backward, and lateral trials with bent and straight legs at three separate loads.

Evidence of a double peak in muscle activation to enhance strike speed and force: an example with elite mixed martial arts fighters.

The main issue addressed here is the paradox of muscle contraction to optimize speed and strike force. When muscle contracts, it increases in both force and stiffness. Force creates faster movement, but the corresponding stiffness slows the change of muscle shape and joint velocity.

Comparison of different rowing exercises: trunk muscle activation and lumbar spine motion, load, and stiffness.

The objective of this study was to investigate 3 different rowing exercises and quantify the muscle activation of the torso and the hip musculature, together with the corresponding spinal loading and stiffness. Seven healthy male subjects from a university population were instrumented to obtain surface electromyography of selected trunk and hip muscles and to obtain spine position using an electromagnetic spine position sensor, together with video analysis to calculate joint moments. The 3 rowing exercises investigated are the inverted row, standing bent-over row, and the standing 1-armed cable row.

Using a pneumatic support to correct sitting posture for prolonged periods: a study using airline seats.

Prolonged sitting with spine flexion has been linked to low back disorders. A variety of mechanisms account for this based on biomechanical and neurological variables. Airline seats typically cause pronounced lumbar flexion due to their hollowed seat back design.

Comparison of different strongman events: trunk muscle activation and lumbar spine motion, load, and stiffness.

Strongman events are attracting more interest as training exercises because of their unique demands. Further, strongman competitors sustain specific injuries, particularly to the back. Muscle electromyographic data from various torso and hip muscles, together with kinematic measures, were input to an anatomically detailed model of the torso to estimate back load, low-back stiffness, and hip torque.

Ballistic abdominal exercises: muscle activation patterns during three activities along the stability/mobility continuum.

The purpose of this study was to document the muscle activity and spine motion during several tasks requiring rapid abdominal contraction. Eight healthy men from a university population were instrumented to obtain surface electromyography of selected trunk and hip muscles, together with video analysis to calculate joint moments and electromagnetic lumbar spine position sensor to track spine posture. Exercises included a punch, throw, and a ballistic torso-stiffening maneuver.

Exercises for the torso performed in a standing posture: spine and hip motion and motor patterns and spine load.

The purpose of this study was to document the muscle activity, spine motion, spine load, and stiffness during several movement-based or "functional" exercises and to assess the effect of technique change. Eight subjects, all healthy men from a university population, were instrumented to obtain surface electromyography of selected trunk and hip muscles, together with video analysis and electromagnetic lumbar spine position sensor to track spine posture. Exercises included a walkout in the sagittal plane that compared an upright form against a wall with those performed on the floor, overhead cable pushes, lateral cable walkouts, the good morning exercise, and the bowler's squat.

Comparison of different rowing exercises: trunk muscle activation and lumbar spine motion, load, and stiffness.

The objective of this study was to investigate 3 different rowing exercises and quantify the muscle activation of the torso and the hip musculature, together with the corresponding spinal loading and stiffness. Seven healthy men from a university population were instrumented to obtain surface electromyography of selected trunk and hip muscles and to obtain spine position using an electromagnetic spine position sensor, together with video analysis to calculate joint moments. The 3 rowing exercises investigated were the inverted row, standing bent-over row, and standing 1-armed cable row.