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Biomedical subjects

J Falkel

Publications and source records attributed to J Falkel.

5 recordsLinked to original sources
PubMed1997

The test-retest reliability of an inclined squat strength test protocol.

Functional testing of the lower extremity is supported as a good predictor for successful return to premorbid activity. However, current reliable functional tests may be too strenuous for a patient in the acute stage of recovery. A functional testing protocol utilizing an inclined sliding board apparatus was evaluated for test-retest reliability. Thirty-five subjects (ages = 18-25, mean = 20.49 +/- 1.71) with no known knee pathologies were tested. Subjects performed a 20-second test for squat repetitions and a 50-squat repetition test for time, executing a single leg squat in an inclined position on the sliding board apparatus. The test was repeated 1 week later. The intraclass correlation coefficient equaled 0.80 for the 50-repetition timed test and 0.89 for the 20-second repetition test. The results indicate an acceptable test-retest reliability for the inclined sliding board apparatus protocol. We advocate the use of this testing protocol for the purpose of evaluating functional ability during the early stages of rehabilitation of lower extremity conditions.

Adolescent↗
PubMed1991

Serum creatine kinase activity and its changes after a muscle biopsy.

The significance of the absolute elevations of serum creatine kinase (CK) levels after intense exercise and injuries was studied by measuring CK activities from seven healthy active males during a 2-week period, with a muscle biopsy taken between the first and second week. Most of the subjects (three lifters and two runners) carried on their normal exercise activities, while two lifters stopped training during the 2 weeks. The weight of the biopsy, number of fibres, percentage of fibre types, and cross-sectional areas of the muscle fibres were measured. The CK levels of the non-active subjects and runners remained consistently low during the control week, whereas those of the lifters were usually 500% greater than those of the other two groups, and fluctuated with the intensity of their workouts. A muscle biopsy, having a mean weight of 71.3 mg and containing 1800 fibres, increased the CK values by approximately 100 units litre-1 (U l-1) in most of the subjects. One runner injured his right hamstring muscles 2 days prior to the biopsy, and his CK values rose from 50 to 4400 U l-1. The increases in CK after the biopsy were not related to fibre type, activity, weight of the biopsy, or number or size of fibres removed. These results indicate that: (1) CK values are consistently lower in normal subjects and runners than in lifters. (2) Weight training results in chronic elevations of CK. (3) Compared to a muscle biopsy, muscular injury dramatically increases CK levels. (4) Elevation of serum CK is observed as early as 1 h after an intense weight-lifting session.(ABSTRACT TRUNCATED AT 250 WORDS)

Biopsy, Needle↗
PubMed1982

The epidemiology of physical activity in children, college students, middle-aged men, menopausal females and monkeys.

Although the inverse relationship between physical activity and coronary heart disease (CHD) has been well documented, little is known concerning the epidemiology of physical activity. A primary reason for the lack of knowledge has been a problem of quantification of physical activity. We have employed the Large-Scale-Integrated (LSI)Activity Monitor in five diverse populations to measure individual physical activity levels. The results indicated that the instrument can accurately index individual physical activity levels, as well as to provide important information concerning the epidemiology of physical activity.

Adolescent↗
PubMed1978

Plantar flexor strength testing using the cybex isokinetic dynamometer.

Twenty male subjects and twenty female subjects in each of three age categories, 6 to 8 years, 14 to 16 years, and 23 to 28 years, were tested on the Cybex Isokinetic Dynamometer to obtain normative strength values for the ankle plantar flexor muscle group. Values were established for both isokinetic and isometric contractions at two speeds. The results indicate that age and weight are the significant variables in determining strength scores.

Adolescent↗