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Biomedical subjects

M Culpepper

Publications and source records attributed to M Culpepper.

3 recordsLinked to original sources
PubMed1989

Height-adjusted, rate-specific, single-stage step test for predicting maximal oxygen consumption.

A suitable ergometer that is generally favored for estimating maximal oxygen consumption (VO2 max) under field conditions or in environments where testing equipment is limited is the step test. Recently a mathematical model was reported to standardize the height of stepping for individuals of various heights. We designed a study to validate this model using a three-minute single-stage step test for predicting VO2 max in women. Seventeen women aged 19 to 33 performed each of three rate-specific step tests and a Bruce treadmill test. Direct measurements of VO2 max obtained from the treadmill test were correlated with the 15 second recovery heart rates after three different step tests done at stepping frequencies of 22, 26, and 30 step-ups per minute. The correlation coefficients of prediction of VO2 max from 15 second recovery pulse counts and directly measured oxygen consumption were 0.74 at 22 step-ups/min, 0.77 at 30 step-ups/min, and 0.8 at 26 step-ups/min. Each relationship was significant at the P less than .01 level. It can be concluded that the single-stage step test described in this study provides an effective predictor of VO2 max in young women and can be used when more complex methods of laboratory testing are unavailable or not feasible.

Adult↗
PubMed1987

Effect of inherent muscle length on isometric plantar flexion torque in healthy women.

This study investigated the relationship between inherent muscle length and torque production in 59 healthy women. We recorded nondominant ankle range-of-motion values for each subject. These values were partitioned into quartiles for two knee positions. Women with "loose" plantar flexor muscles comprised the first quartile, and those with "tight" plantar flexor muscles the fourth quartile. Tight- and loose-muscle groups were established for the 0-degree (fully extended) and 90-degree (flexed) knee test positions for data analysis. Torque measurements were obtained using an isokinetic testing apparatus. We asked each subject to perform a maximal isometric (static) plantar flexion contraction at each of three ankle positions: 7 degrees of dorsiflexion (angle A), 0 degrees or neutral (angle B), and 30 degrees of plantar flexion (angle C). Data analysis was performed using an analysis of variance for repeated measures. Results indicated that torque produced by the tight-muscle groups was significantly greater than the torque produced by the loose-muscle groups at both knee positions (p less than .05). Additionally, the ankle ROM data obtained suggest normative data different from those currently prevalent in the literature. Findings of this study may prove valuable in the rehabilitation of ankle injuries and could be beneficial especially to physical therapists in understanding more about normal ankle function.

Adolescent↗