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J M Rothstein

Publications and source records attributed to J M Rothstein.

At least 19 recordsLinked to original sources
PubMed1992

Obtaining reliable measurements of knee extensor torque produced during maximal voluntary contractions: an experimental investigation.

The purpose of this study was to develop and test a protocol that could be used to obtain reliable measurements of knee extensor torque produced during maximal voluntary contractions. On each of 3 days, 10 subjects performed six consecutive maximal voluntary contractions, in the same randomized order, for each of the following 10 conditions: concentric isokinetic contractions at velocities of 30 degrees, 90 degrees, 120 degrees, and 180 degrees/s; eccentric isokinetic contractions at velocities of 30 degrees, 90 degrees, 120 degrees, and 180 degrees/s; and isometric contractions at 40 and 60 degrees of knee flexion. The peak torques produced were examined to determine on which day and during which contraction subjects produced the greatest torques for each condition. This information was used to develop a practice protocol. Fifteen different subjects were tested following this protocol. Subjects participated in two practice sessions, a test session, and a retest session. Intraclass correlation coefficients (ICCs) were calculated to determine the degree of agreement between torques for the test and retest sessions. The ICCs ranged from .87 to .98. The protocol developed appears to be useful for obtaining reliable measurements of knee extensor torque.

Acceleration↗
PubMed1992

Believe it or not!

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Activities of Daily Living↗
PubMed1992

Bulimia: the otolaryngology head and neck perspective.

Bulimia nervosa is an eating disorder found predominantly in young females and characterized by binge-purge cycles as well as medical and psychological problems. The patient with bulimia may present to the otolaryngologist with an upper aerodigestive complaint. It is of paramount importance that the otolaryngologist be cognizant of the disease in order to refer the patient for further therapy.

Adolescent↗
PubMed1991

Sticks and stones.

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Persons with Disabilities↗
PubMed1991

Exercise-induced muscle soreness after concentric and eccentric isokinetic contractions.

The purpose of this two-part study was to determine whether the amount of exercise-induced muscle soreness differs between subjects who perform concentric and eccentric isokinetic contractions of their quadriceps femoris muscles. In experiment 1, subjects were randomly assigned to either an eccentric or a concentric exercise group and both groups exercised at the same power level. In experiment 2, subjects were randomly assigned to either an eccentric or a concentric exercise group and both groups exercised with maximal effort. Muscle soreness ratings, obtained by using a visual analogue scale, were taken immediately before exercise and at 24 and 48 hours postexercise. Changes in muscle soreness ratings between exercise groups from preexercise to postexercise periods were compared in both experiments, using a one-way between-subjects analysis of variance. There was no difference in the change in muscle soreness from preexercise to post-exercise periods between groups exercising at equal power levels. Subjects who exercised using eccentric contractions with maximal effort demonstrated greater increases in muscle soreness than those who performed concentric contractions. The results suggest that exercise intensity, rather than contraction type, may be the dependent factor in producing exercise-induced muscle soreness.

Adult↗
PubMed1991

AIDS and the exodus.

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Acquired Immunodeficiency Syndrome↗