Correlation of Isokinetic Testing and ACL Failure With the Short Graft Tape Suspension Technique at Six Months

Differences in strength and landing biomechanics between female jumpers and swimmers

Isokinetics and Exercise Science ◽

10.3233/ies-210149 ◽

2021 ◽

pp. 1-11

Author(s):

Mianfang Ruan ◽

Qiang Zhang ◽

Xin Zhang ◽

Jing Hu ◽

Xie Wu

Keyword(s):

Muscle Force ◽

Female Athletes ◽

Young Female ◽

Single Component ◽

Plyometric Training ◽

Isokinetic Testing ◽

Female College ◽

Landing Biomechanics ◽

Drop Landing ◽

Landing Mechanics

BACKGROUND: It remains unclear if plyometric training as a single component could improve landing mechanics that are potentially associated with lower risk of ACL injury in the long term OBJECTIVE: The purpose of this study was to investigate the influence of experience undertaking plyometrics on landing biomechanics in female athletes. METHODS: Non-jumpers with little experience in plyometric training (12 female college swimmers) and jumpers with five years of experience in plyometric training (12 female college long jumpers and high jumpers) were recruited to participate in two testing sessions: an isokinetic muscle force test for the dominant leg at 120∘/s and a 40-cm drop landing test. An independent t test was applied to detect any significant effects between cohorts for selected muscle force, kinematic, kinetic, and electromyography variables. RESULTS: While female jumpers exhibited greater quadriceps eccentric strength (P= 0.013) and hamstring concentric strength (P= 0.023) during isokinetic testing than female swimmers, no significant differences were observed in kinematics, kinetics, and muscle activities during both drop landing and drop jumping. CONCLUSIONS: The results suggest that the female jumpers did not present any training-induced modification in landing mechanics regarding reducing injury risks compared with the swimmers. The current study revealed that plyometric training as a single component may not guarantee the development of low-risk landing mechanics for young female athletes.

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Discipline and Sex Differences in Angle-specific Isokinetic Analysis in Elite Skiers

International Journal of Sports Medicine ◽

10.1055/a-0850-0016 ◽

2019 ◽

Vol 40 (05) ◽

pp. 317-330 ◽

Cited By ~ 2

Author(s):

Marine Alhammoud ◽

Baptiste Morel ◽

Clint Hansen ◽

Mathew Wilson ◽

Regis Mecca ◽

...

Keyword(s):

Statistical Parametric Mapping ◽

Knee Extension ◽

Current Data ◽

Screening Methods ◽

Full Extension ◽

Isokinetic Testing ◽

Parametric Mapping ◽

National Team ◽

Alpine Skiers ◽

The Impact

AbstractStandard outcomes of traditional isokinetic testing do not detect differences between various muscle mechanical properties. This study i) explored a novel analysis throughout the range of motion based on statistical parametric mapping and ii) examined the impact of sex and discipline on hamstrings/quadriceps torque in elite alpine skiers. Twenty-eight national team skiers (14 females, 14 males; 14 technical, 14 speed) undertook an isokinetic evaluation of the knee flexors/extensors (range 30–90°, 0° representing full extension). There was no effect of sex (p=0.864, d=0.03) and discipline (p=0.360, d=0.17) on maximal hamstrings-to-quadriceps ratio and no effect of discipline on maximal torque (p>0.156, d≤0.25). Hamstrings torque and hamstrings-to-quadriceps ratio were lower in females than males toward knee extension only (p<0.05). Quadriceps torque was greater after 72° of knee flexion in technicians than downhill skiers (p<0.05). The current data showed that statistical parametric mapping analysis identified angle-specific differences that could not be evidenced when analyzing only maximal torques and reconstructed ratios. This may enhance screening methods to identify pathologic knee function or monitor rehabilitation programs, and inform sex- and discipline-specific training in alpine skiing.

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Validity of Isokinetic and Isometric Testing modalities for Assessing Short-term Resistance Exercise Strength Gains

Journal of Sport Rehabilitation ◽

10.1123/jsr.1.4.275 ◽

1992 ◽

Vol 1 (4) ◽

pp. 275-283 ◽

Cited By ~ 5

Author(s):

Andrew C. Fry ◽

Dawn R. Powell ◽

William J. Kraemer

Keyword(s):

Resistance Exercise ◽

Human Performance ◽

Peak Torque ◽

Quadriceps Strength ◽

Short Term ◽

Isokinetic Testing ◽

Leg Extension ◽

Leg Flexion ◽

Isokinetic Torque ◽

Torque Values

Although it is generally accepted that human performance must be assessed in a manner specific to the training, previous studies have violated this principle. In order to determine the validity of evaluating short-term resistance training programs with isometric and isokinetic measures, 23 recreationally active males participated in an 8-week training program. Subjects were randomly divided into barbell squat, hip sled, leg extension, and control groups. Pre- and posttesting of quadriceps strength was performed with a Cybex isokinetic dynamometer. Six angle-specific torques (N.m) were determined at 0 rad-s-1 and 1.05 rad-s-1. Ten RM training loads increased significantly for all groups that trained. Isometric torque values differed significantly from isokinetic torque values at 30, 60, 75, and 90° of leg flexion for all groups. No significant torque increases from pre- to posttest were observed for any group at any limb angle for either isometric or isokinetic testing, or for isokinetic peak torque. This indicates that strength increases during short-term dynamic external resistance exercise are not adequately assessed with either isometric or isokinetic evaluations.

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Reproducibility of velocity-dependent power: before and after lengthening contractions

Applied Physiology Nutrition and Metabolism ◽

10.1139/h11-068 ◽

2011 ◽

Vol 36 (5) ◽

pp. 626-633 ◽

Cited By ~ 17

Author(s):

Geoffrey A. Power ◽

Brian H. Dalton ◽

Charles L. Rice ◽

Anthony A. Vandervoort

Keyword(s):

Peak Power ◽

High Reliability ◽

Similar Amount ◽

Shortening Velocity ◽

Lengthening Contractions ◽

Isokinetic Testing ◽

Typical Error ◽

Before And After ◽

Absolute Reliability ◽

Ankle Dorsiflexors

The determination of power using isokinetic testing has been shown to be highly reliable. However, isotonic and isokinetic testing involve specific mechanical constraints that likely necessitate different neuromuscular strategies. Therefore, the purpose here was to establish test–retest intrarater reliability (separated by 7 days) of loaded maximal shortening velocity and velocity-dependent power of the ankle dorsiflexors using the isotonic mode of the Biodex dynamometer (i) at baseline and (ii) throughout recovery following 150 high-intensity lengthening contractions. Intraclass correlation coefficients (ICC)2,1 with 95% CIs were used to determine relative reliability, whereas absolute reliability included typical error (TEM) and typical error expressed as a coefficient of variation (TEMCV). Twenty-four young men and women volunteered for the study. Maximal shortening velocity and power were determined with a fixed resistance set at 20% of maximal voluntary isometric contraction across 2 testing sessions separated by 7 days. ICCs were 0.93 and 0.98 for maximal shortening velocity and peak power, respectively. Following the lengthening contractions, ICCs indicated high reliability for maximal shortening velocity and peak power, 0.86 and 0.94, respectively, suggesting that a similar amount of fatigue was incurred on both days. Measures of absolute reliability for maximal shortening velocity and peak power also yielded high reliability. The isotonic mode is highly reliable when testing velocity-dependent power of the ankle dorsiflexors at baseline and following fatiguing lengthening contractions. The high reliability of this measure is encouraging and suggests that the isotonic mode can be used in various settings to track group changes before and after training and following fatigue and lengthening contractions.

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Repair of Distal Biceps Tendon Ruptures Using a Suture Anchor and an Anterior Approach

Journal of Hand Surgery (European Volume) ◽

10.1016/j.jhsb.2003.07.002 ◽

2004 ◽

Vol 29 (2) ◽

pp. 178-182 ◽

Cited By ~ 86

Author(s):

L. BALABAUD ◽

C. RUIZ ◽

J. NONNENMACHER ◽

P. SEYNAEVE ◽

P. KEHR ◽

...

Keyword(s):

Anterior Approach ◽

Suture Anchor ◽

Single Incision ◽

Biceps Tendon ◽

Clinical Results ◽

Distal Biceps Tendon ◽

Isokinetic Testing ◽

Distal Biceps ◽

Tendon Ruptures ◽

A Prospective Study

In a prospective study, eight consecutive patients with nine ruptures of the distal biceps tendon underwent repair through a single incision. All patients were satisfied with their clinical results and had full ranges of elbow and forearm motion. There were no radial nerve injuries and no radio-ulnar synostoses. Isokinetic testing, after correction for dominance, demonstrated a 6% strength deficit, but 7% higher endurance in the repaired extremity for the flexion-concentric test, and no strength deficit and 13% higher endurance for supination. The improved endurance is probably explained by initial reduced effort due to apprehension which minimized subsequent fatigue.

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