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Publications (87)
The purpose of this study was to examine differences between a free-weight squat (FWS) and machine squat (MS) during an initial resistance training phase for augmentation of performance tests in recreationally active women. Twenty-seven women (22.7 ± 3.5 years) were block-randomized to three groups: FWS, MS, or control (CON) and completed pre- and...
Ankle sprain is the most commonly diagnosed injury experienced by ballet dancers with few studies investigating preventive support measures such as Kinesio taping. The need exists to examine the mechanical support characteristics of Kinesio taping and effect of application on ankle motion and performance. This may be important to understanding the...
Introduction: T'ai chi chuan is a beneficial exercise of improving health and function. Biomechanical insights of t'ai chi chuan are less understood.
Objectives: To study t'ai chi gait (TCG), a common form of t'ai chi chuan in order to quantify external knee adduction moment (EKAM) as a key indicator of mechanical loading of the medial compartment...
Robotic assisted rehabilitation, taking advantage of neuroplasticity, has been shown to be helpful in regaining some degree of gait performance. Robot-applied movement along with voluntary efferent motor commands coordinated with the robot allows optimization of motion training. We present the design and characteristics of a novel foot-based 6-degr...
Background Ankle sprain is the most commonly diagnosed injury experienced by ballet dancers. Traditional taping and bracing affect function by restricting range of motion but are aesthetically unappealing as practical modes of injury prevention for ballet dancers. Few studies have investigated alternative support measures such as Kinesio® taping.
O...
Context
This is part II of a 2-part series discussing stability characteristics of the ankle complex. In part I, we used a cadaver model to examine the effects of sectioning the lateral ankle ligaments on anterior and inversion motion and stiffness of the ankle complex. In part II, we wanted to build on and apply these findings to the clinical asse...
Context
The mechanical property of stiffness may be important to investigating how lateral ankle ligament injury affects the behavior of the viscoelastic properties of the ankle complex. A better understanding of injury effects on tissue elastic characteristics in relation to joint laxity could be obtained from cadaveric study.
Objective
To biomec...
Valid and reliable measurements of ankle-complex motion have been reported using the Hollis Ankle Arthrometer. No published normative data of ankle-complex motion obtained from ankle arthrometry are available for use as a reference for clinical decision making.
To describe the distribution variables of ankle-complex motion in uninjured ankles and t...
The use of oral corticosteroid (OCS) drugs is advocated because of their potent anti-inflammatory effects. They also possess many potential adverse effects. No study has assessed physician prescribing practices of OCS therapy in high school (HS) or college (COL) athletes. This paper reports the prescribing patterns of sports medicine physicians who...
Generalizability theory is an appropriate method for determining the reliability of measurements obtained across more than a single facet. In the clinical and research settings, ankle-complex laxity assessment may be performed using different examiners and multiple trials.
To determine the reliability of ankle-complex laxity measurements across dif...
Anterior drawer testing of the ankle is commonly used to diagnose lateral ligamentous instability. Our hypothesis was that changing knee and ankle positions would change the stability of the ankle complex during anterior drawer testing.
To assess the effects of knee and ankle position on anterior drawer laxity and stiffness of the ankle complex.
A...
Muscle strength and endurance of the shoulder rotators is important for overhead throwing performance and dynamic glenohumeral stability. Baseball pitching is distinguished as an intermittent activity with explosive, high intensity muscle contractions separated by periods of rest. Rotator cuff muscle performance could acutely decrease due to fatigu...
The relations among year of eligibility, sex, and achievement motivation were investigated with 88 athletes representing three levels of collegiate eligibility (Year 1, Year 2/3, and Year 4) by sex. Participants were given Achievement Motivation subscales for Sporting Environments (approach-success practice, approach-success competition, failure-av...
The purpose of this study was to evaluate whether lower extremity joint laxity is a function of a particular joint and/or a generalizable characteristic (trait) of the person. Validated instrumented measurements of ankle and knee joint-specific laxity in the same individual were correlated to determine whether a relationship exists. In addition, an...
The effects of specific versus variable practice on retention and transfer was investigated. 30 participants were randomly assigned to one of three practice conditions. The variable speed group practiced on a pursuit rotor task at three different speeds (60, 45, 30 rpm) which were randomly distributed but equal in number for 30 10-sec. trials on Da...
The effects of specific versus variable practice on retention and transfer was investigated. 30 participants were randomly assigned to one of three practice conditions. The variable speed group practiced on a pursuit rotor task at three different speeds (60, 45, 30 rpm) which were randomly distributed but equal in number for 30 10-sec. trials on Da...
The practice of sports medicine represents a unique subspecialty within the discipline of medicine. Practitioners provide care for athletes who engage in activities that may put the athletes at risk for serious injury. Physicians may be held legally liable for not doing a standardized pre-participation evaluation, for not administering adequate on-...
The practice of sports medicine represents a unique subspecialty within the discipline of medicine. Practitioners provide care for athletes who engage in activities that may put the athletes at risk for serious injury. Physicians may be held legally liable for not doing a standardized preparticipation evaluation, for not administering adequate on-s...
The findings of research on the effectiveness of ankle taping for protection against ligament injury have been inconsistent, and the topic remains controversial. The precise orientation of the force vectors created by tension within the various tape strip components of an ankle taping procedure may be a critical factor influencing the degree of mot...
The effects of sex and competitive status (athlete vs nonathlete) on ankle inversion-eversion range of motion was investigated. 62 collegiate athletes and 36 collegiate nonathletes, both male and female, were tested. Analysis of variance showed significant (p<.05) main effects for sex but not competitive status or sex x competitive status. These re...
The effects of sex and competitive status (athlete vs nonathlete) on ankle inversion–eversion range of motion was investigated. 62 collegiate athletes and 36 collegiate nonathletes, both male and female, were tested. Analysis of variance showed significant (p < .05) main effects for sex but not competitive status or sex × competitive status. These...
Delineating between functional and mechanical instability in those with chronic ankle dysfunction is a challenging task. Current methods of assessing ankle ligamentous laxity are subjective in nature and limit our ability to identify the site and extent of instability; therefore, a need exists for objective laxity measurements. The purpose of this...
The relation of leg, shoulder, and grip strength to ball speed in the tennis serve was investigated. For 15 collegiate male tennis players, leg and shoulder strength were measured using a Lido Active isokinetic dynamometer, grip strength with a handgrip dynamometer, and ball speed with a radar gun. Regression analysis showed no significant (p<.05)...
The relation of leg, shoulder, and grip strength to ball speed in the tennis serve was investigated. For 15 collegiate male tennis players, leg and shoulder strength were measured using a Lido Active isokinetic dynamometer, grip strength with a handgrip dynamometer, and ball speed with a radar gun. Regression analysis showed no significant (p<.05)...
Context
Measurement reliability is critical when new sports-medicine devices or techniques are developed.
Objective
To determine the reliability of laxity measurements obtained from an instrumented ankle arthrometer.
Design
Intratester reliability was examined using a test–retest design, and intertester reliability was assessed using the measurem...
OBJECTIVE: To show the relationship between direct measurements of tibial-calcaneal bone motion and instrumented measurements of ankle-subtalar-joint-complex laxity using a portable ankle arthrometer; to assess within and between-tester measurement reliability; and to determine if the ankle arthrometer can detect increased mechanical laxity of the...
Instrumented measurement can be used as an adjunct to manual examination for ankle laxity. Quantifying the load-displacement characteristics of the ankle-subtalar-joint-complex could advance our clinical and research efforts, providing for enhanced treatment and rehabilitation programs. Research should be directed toward helping maximize patient re...
The relation of legs, arms, shoulders, and grip strength with underhand pitching speed of experienced and inexperienced female pitchers was investigated. For 16 experienced female underhand pitchers and 16 inexperienced women with no softball experience (control group) leg and arm strength were measured using a Hydrafitness exercise machine. Grip s...
The relation of legs, arms, shoulders, and grip strength with underhand pitching speed of experienced and inexperienced female pitchers was investigated. For 16 experienced female underhand pitchers and 16 inexperienced women with no softball experience (control group) leg and arm strength were measured using a Hydrafitness exercise machine. Grip s...
Context: Isokinetic strength and functional performance are used to assess recovery after rehabilitation. It is not known whether low-speed closed-linear-kinetic isokinetic muscle strength correlates with functional performance. Objective: To investigate the relationship between linear closed (CKC) and open (OKC) concentric isokinetic strength of t...
This study investigated the possible relationship for legs, arms, shoulders, and grip strength with underhand throwing speed. 40 female subjects had their legs, arms, and shoulder strength measured using a multipurpose exercise machine for assessing resistive force. Grip strength was measured using a handgrip dynamometer. Underhand throwing speed w...
This study investigated the possible relationship for legs, arms, shoulders, and grip strength with underhand throwing speed. 40 female subjects had their legs, arms, and shoulder strength measured using a multipurpose exercise machine for assessing resistive force. Grip strength was measured using a handgrip dynamometer. Underhand throwing speed w...
Manual examination is the most common method for the evaluation of ankle anteroposterior (AP) and inversion-eversion (I-E) laxity. Objective assessment data of normal ankle laxity must be provided before comparison with an injured ankle can be made. The purpose of this study was to compare AP translation and I-E rotation at three force loads betwee...
Objective: The purpose of our study was to assess the reliability of the Closed Chain Rider System between exercise sessions and to determine the effects of arm dominance using muscle force, work, and power measures during closed chain chest-press exercise. Design and Setting: Sitting subjects underwent identical testing on 2 occasions and performe...
The purpose of our study was to assess the reliability of the Closed Chain Rider System between exercise sessions and to determine the effects of arm dominance using muscle force, work, and power measures during closed chain chest-press exercise.
Sitting subjects underwent identical testing on 2 occasions and performed 5 reciprocal chest-press move...
The purpose of this study was to assess the reliability of the Closed Chain Rider System (Mettler Electronics) between exercise sessions and to determine the effects of limb dominance using muscle force and work measures during closed chain leg press exercise. Thirty-nine recreationally active college students underwent identical testing on two occ...
Isokinetic tests for ankle eversion strength at 30 and 60 deg/sec. speeds for 9 patients with recurring ankle sprains detected no differences at 8 and 34 weeks postinjury.
Isokinetic tests for ankle eversion strength at 30 and 60 deg/sec. speeds for 9 patients with recurring ankle sprains detected no differences at 8 and 34 weeks postinjury.
The purpose of this study, was to assess the effects of constant versus variable practice conditions on motor performance and learning of individuals with learning disabilities. Participants (3 females; 21 males; mean age = 10.8 years; range 9-12 years) were individuals with learning disabilities required to learn three different versions of the sa...
The BTE Dynatrac is an isotonic dynamometer in where the preset resistance determines the effort and the limb must overcome the resistance to accelerate through the ROM. Previous reliability studies of isokinetic devices do not apply to this type of dynamometer. Therefore, the purpose of this study was to assess the reliability of the BTE Dynatrac...
To examine training (3 d.wk-1 for 6 wk) differences using active robotic isotonic and isokinetic concentric knee extension resistance on full range of motion (ROM) (90 degrees to 0 degree of flexion) strength development and power, 22 men and 10 women were randomly assigned to either an isotonic, isokinetic, or control group. The isotonic group exe...
Controversy still exists regarding the use of isokinetic and isotonic exercise in rehabilitation. Many authors have compared these two types of training methods on various strength measures and functional activity, but have used open kinetic chain training. The purposes of this investigation were to determine: 1) which form of closed kinetic chain...
Problems during the deceleration phase of running include muscle trauma and eccentric force deficits caused by a maladaptation within the nervous system. Eccentric muscle dysfunction should be greater in runners than in cyclists because cycling does not involve weight-bearing repetitive deceleration. Therefore, we compared the endurance of runners...
To examine training (3 d.wk -1 for 6 wk) differences using active robotic isotonic and isokinetic concentric knee extension resistance on full range of motion (ROM) (90° to 0° of flexion) strength development and power, 22 men and 10 women were randomly assigned to either an isotonic, isokinetic, or control group. The isotonic group exercised using...
Resistance/strength training is added to an exercise regimen to create a well-rounded program that enhances muscular conditioning and improves health, physical fitness, and/or athletic performance. This article presents resistance training guidelines for individuals with diabetes mellitus, with and without vascular complications. The existing liter...
Although the effectiveness of exercise as a treatment modality for the management of diabetes mellitus has long been recognized, a vital component of the exercise prescription has been overlooked. In addition to endurance training, resistance training may provide physiologic benefits to the individual with diabetes that, in some cases, may equal or...
The purpose of this study was to assess the effect of variation in the order of four different isokinetic velocity exercise protocols on muscle torque production. Twenty‐two subjects were randomly assigned to four exercise trials, each containing an isokinetic exercise session involving the dominant knee extensor and flexor. Each trial consisted of...
We examined the interaction between velocity and progression order on average power and torque production during isokinetic velocity spectrum exercise (lVSE). Twenty-two subjects were assigned randomly to four exercise trials, each containing an isokinetic exercise session involving the dominant knee extensors. Each exercise trial consisted of two...
The purpose of this study was to determine the test-retest reliability of isokinetic torque measurements using subjects who were moderately mentally retarded. An isokinetic dynamometer was used to measure maximal voluntary knee extension and flexion at speeds of 90°/s 180°/s 300°/s Peak torque (PT) and average peak torque (APT) data were collected...
In this study we compared the influence that the order of the performance of different velocity exercise progressions has on average muscle power and total work production during a velocity spectrum isokinetic training session. Twenty-two college students were assigned randomly to four exercise trials, each containing an isokinetic exercise trainin...
Samenvatting Bij een onderzoek naar de kracht van de dijmusculatuur na een partiële artroscopische meniscectomie van de knie werden 24
geopereerde patiënten onderzocht. Ze werden ingedeeld in drie groepen. Groep 1:leeftijd 20 jaar, groep 2 leeftijd 24–45 jaar
en groep 3 leeftijd 50 jaar. De proefpersonen werden onderzocht onmiddellijk na de operati...
In an effort to examine thigh muscle strength following partial arthroscopic meniscectomy of the knee, 24 surgical patients were studied. They were divided into group 1 (age <20 years), group 2 (age 24-45 years), and group 3 (age >50 years). Subjects were studied immediately after surgery, weekly during isokinetic rehabilitation, and weekly after r...
Eight men were heat acclimated (39.6 degrees C and 29.2% rh) for 8 days to examine changes in substrate utilization. A heat exercise test (HET), (cycling for 60 min; 50% maximal O2 consumption) was performed before (UN-HET) and after (ACC-HET) the acclimation period. Muscle glycogen utilization (67.0 vs. 37.6 mmol/kg wet wt), respiratory exchange r...
The purpose of this study was to examine the effects of pre-exercise glucose and fructose feedings on muscle glycogen utilization during exercise in six well-trained runners (VO2max = 68.2 +/- 3.4 ml X kg-1 X min-1). On three separate occasions, the runners performed a 30 min treadmill run at 70% VO2max. Thirty minutes prior to exercise each runner...
Male (n = 25) and female (n = 14) competitive swimmers were studied during tethered (breaststroke) and free (front crawl) swimming to determine the validity of calculating exercise oxygen uptake (VO2) from expired gas samples taken immediately after the activity. Based on a single 20-s recovery VO2, the swimmers' VO2 max was correlated with perform...
Nine men were studied during three 4-h cycling bouts to determine the effect of frequency and dosage of solid carbohydrate (CHO) feedings (86 g) on muscle glycogen utilization and exercise performance. In the frequency trial (F), the subjects ingested 10.75 g of CHO along with 200 ml of water at 30-min intervals; in the dosage trial (D), the subjec...
Descriptive information about female athletes will help physicians, trainers, and coaches design conditioning programs and determine playing positions. We described selected physical and physiological characteristics in women college volleyball players and compared the varsity and junior varsity groups. Within the limitations of the sample, the com...
Typescript. Thesis (M.A.)--Central Michigan University. Includes bibliographical references (leaves 75-78).
