Biomedical subjects

E Vlahov

Publications and source records attributed to E Vlahov.

4 recordsLinked to original sources

PubMed1980

Visual effects of exercise: sensory or decision criterion change.

An experiment was conducted to determine if improvement in resolution acuity due to exercise was based on changes in sensory discrimination or decision criterion. Two subjects participated in 15 exercise sessions of 1100 kpm per min. On a bicycle ergometer and 5 control sessions. After each exercise and non-exercise condition, resolution acuity was determined using a Yes-No indicator-response method. Significant improvement of resolution acuity was found after the exercise sessions. Threshold probabilities did not change significantly when corrected for spurious Yes responses, suggesting that differences were probably effects in sensory discrimination.

Decision Making↗

PubMed1979

Effect of different workloads varying in intensity and duration on resolution acuity.

An experiment was conducted to determine the effect of participation in physical activity on resolution acuity. In the experiment, 21 undergraduate males participated in exercise sessions with work loads of 300, 700, and 1100 kmp for durations of 3 and 6 min. and a non-exercise control session. Resolution acuity was then determined by finding thresholds of a 20-cpd sinusoid-wave grating using the method of adjustment. A repeated-measures analysis of variance compared the effects of different workloads, intensities, and durations of workloads, and the interaction of intensity and duration on resolution acuity. Significant improvement of resolution acuity was found for all workloads relative to the non-exercise control session, for all other workloads relative to the 300 kpm/3 min. workload, and for the 1100 kpm/6 min. workload relative to the 300 kpm/6 min. and the 700/3 min. workloads. Increases in duration or intensity of exercise significantly improved resolution acuity. There was no significant interaction of the variables of intensity and duration of work on resolution acuity.

Humans↗

PubMed1977

Effect of the Harvard Step Test on visual acuity.

A replication with 5 females in a laboratory setting of findings by Kashuk that physical activity improves visual acuity used the Harvard Step Test for the exercise load and grating acuity (resolution acuity) to determine possible changes. The results support Kashuk's work.

Female↗

PubMed1977

Cardiorespiratory variables in middle-aged men.

The purpose of this investigation was to assess the relationship among selected physican and cardiorespiratory variables in active men, aged 40-59 years. Thirty-one subjects who had been running for only an average of five years volunteered for treadmill testing, running to volitional exhaustion. For the total group (40-59 yrs), significant negative correlations were found between age and maximal heart rate (HR max) and age and maximal oxygen uptake (VO2 max), suggesting an inverse relationship between these variables. In both the 40-49 and the 50-59 yr groups, significant positive correlation coefficients were obtained between VO2 max (liters/min) and VO2 max (ml/kg/min), between VO2 max (ml/kg/min) and O2 pulse (ml/kg/min), and between VO2 max (liters/min) and V E max (maximal pulmonary ventilation) liters/min), In both these groups, resting heart rate (HR rest) was significantly positively related to HR max and also to HR 1 min after recovery (1 min rec). Overall, however, the correlation coefficients between selected variables were low, implying that the evaluation of cardiorespiratory variables in these age groups should be based upon several variables.

Adult↗