Dennis Landin

Louisiana State University | LSU · School of Kinesiology

The triceps brachii (TB) is the only muscle that lies along the posterior humerus, and its role in elbow extension has been the topic of investigation for many decades. The TB research has also included subjects such as strength training, effects of aging, training adaptions, etc. The purpose of this paper was to review some of the more unique inve...

Bi-articular muscles cross more than one joint and contribute to motion at both joints, and the extremities of the human body contain several such muscles. Actions produced by all muscles are determined, to a large extent, by joint moment arms and muscle length. These are transient factors which change as joint angles are altered. Measuring muscle...

The extremities of the human body contain several bi-articular muscles. The actions produced by muscles at the joints they cross are greatly influenced by joint moment arms and muscle length. These factors are dynamic and subject to change as joint angles are altered. Therefore, to more completely understand the actions of such muscles, the angles...

The gastrocnemius (GA) is the lone bi-articular muscle of the leg, crossing both the knee and ankle. As with any bi-articular muscle, both joints affect its length/tension curve. The role of the GA as a plantarflexor is firmly established; however, no current research has investigated how changes in knee and ankle joint positions on its ability to...

This poster presentation reviewed the case of an adolescent baseball pitcher.

Supraspinatus tendinopathy is a common cause of shoulder pain seen in overhead athletes, but there appear to be no published cases that present Lyme disease as the underlying cause of tendinopathy. Lyme disease is diagnosed primarily by clinical signs and symptoms and then supported by laboratory tests, including enzyme-linked immunosorbant assay (...

Elevation of the arm during a dynamic scaption exercise will result in a progressive narrowing of the acromiohumeral interval (AHI); however, the addition of a load will not significantly affect the AHI in healthy baseball players. Thirteen healthy baseball players performed a seated scaption exercise from 0° to 90°, with and without a normalized a...

The triceps brachii (TB), the sole muscle of the posterior humerus, acts an extensor of the elbow and shoulder. As a biarticular muscle, the angles of the elbow and shoulder influence its' ability to generate joint moments. The purpose of this study was to investigate the influence of elbow and shoulder joint angles on the shoulder extension functi...

The biceps brachii is a bi-articular muscle affecting motion at the shoulder and elbow. While its' action at the elbow is well documented, its role in shoulder elevation is less clear. Therefore, the purpose of this project was to investigate the influence of shoulder and elbow joint angles on the shoulder elevation function of the biceps brachii....

Previous research has shown that static stretching (SS) can diminish the peak force output of stretch-shortening cycle actions while performing a dynamic warm-up (DW) protocol has been shown to enhance performance in similar activities. The purpose of this study was to establish whether the deleterious effects of SS would wash out the performance e...

The purpose of this study was to explore the effects of various exercise sequences in the early weeks of a strength training program. Forty-two untrained men were randomly assigned to one of 4 training regimens, which were differentiated by the order in which the exercises were performed, and trained 3 days per week for 4 weeks. Three regimens were...

The purpose of this study was to explore the effects of various exercise sequences in the early weeks of a strength training program. Forty-two untrained men were randomly assigned to one of 4 training regimens, which were differentiated by the order in which the exercises were performed, and trained 3 days per week for 4 weeks. Three regimens were...

The motor learning literature is replete with studies investigating the contextual interference (CI) effect. However, CI research has focused on performance outcome measures, largely ignoring the influence varying levels of CI may have on performance production measures, particularly with tasks involving inter-limb coordination. It was the purpose...

This study compared the effects of self-talk strategy (ST) and knowledge of performance (KP) feedback on learning the forehand tennis groundstroke. Three experimental groups met during their regular tennis class for seven days to examine the interactions between ST and feedback (FB). The instructors (N = 3) taught three groups of eight randomly ass...

The results of previous research have shown that passive muscle stretching can diminish the peak force output of subsequent maximal isometric, concentric and stretch-shortening contractions. The aim of this study was to establish whether the deleterious effects of passive stretching seen in laboratory settings would be manifest in a performance set...

The concept of progression, or presenting content in a series of increasingly difficult tasks, is central to instruction, yet little physical education research has examined how specific types of progressions influence student engagement and achievement. In this study, university students enrolled in tennis classes were taught and practiced the ser...

Despite extensive motor learning literature concerning practice schedules, clear guidelines for organising practice sessions in applied settings have yet to be formulated. It was the purpose of this study to explore the effects of three levels of contextual interference (CI) with adults naíve to a sport skill. Participants (N=36) were taught two th...

The gastrocnemius has been viewed as an important contributor at the knee joint as a joint flexor and stabilizer across all the knee and ankle joint angles. The purpose of this study was to investigate the influence of knee and ankle joint angles on the knee flexor function of the gastrocnemius. Seventeen participants were tested on a Biodex dynamo...

The Effects of Moderate Contextual Interference on Learning Sport Skills Dennis Landin. Louisiana State University; Justin Menickelli, University of Western Carolina; Wes Grisham, Louisiana State University; and Edward P. Hebert, Southeastern Louisiana University Despite the existence of extensive research concerning practice scheduling, clear g...

A major focus of research on teaching and learning for the past decade has been directed toward developing an understanding of student behaviors and thought processes related to achievement. Using a mediational-processes approach, researchers have identified engagement variables that predict skill learning gains, most notably the quality and quanti...

This paper reports on the development and implementation of a self-talk (ST) strategy designed to improve the volleying skill of collegiate tennis players (N = 5). A two-word ST strategy was developed, implemented, and evaluated using a single-case, multiple-baseline design. Dependent measures were movement patterns and outcome scores. After interv...

This study examined the effects of practice schedule manipulations implemented in an instructional setting on the performance and learning of low- and high-skilled students. College undergraduates (N = 83) enrolled in 5 tennis classes completed a pretest on the forehand and backhand ground strokes, practiced these skills under a blocked or alternat...

This experiment investigated the effects of observing a learning model and receiving augmented verbal feedback on the acquisition and retention of the tennis volley. Female undergraduate students were randomly assigned to four groups: (a) AFB--received augmented verbal feedback from an instructor, (b) LMFB--monitored a learning model's trials and f...

Verbal cues are concise phrases, often just one or two words, that are used as an alternate method of communicating task information. Research in motor learning and sport pedagogy has examined the effects of verbal cues in directing attention to critical task stimuli and information, recalling series of motor activities, and initiating movement seq...

Thirty fourth-grade students were provided two 30-min lessons on the tennis forehand ground stroke. The students and the teacher were videotaped, and, following each lesson, the students were interviewed using a stimulated-recall procedure. Frequency measures of successful practice trials were also coded for each student during each practice sessio...

This study examined the relationship between the total number of practice trials and practice trials using correct technique and achievement in a soccer kick-up skill. Eight preservice physical education teachers taught two lessons to 10 fourth-grade students; upon completion of the instructional periods the students were posttested on the soccer s...

27 children who were classified as reflective and 30 classified as impulsive showed significant differences on an obstacle course requiring specific movements in sequential order. Mean trials to criterion was lower for the reflective group, but there was no difference in running speed after criterion had been reached. Boys ( n = 27) were faster tha...