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Biomedical subjects

J V Chandler

Publications and source records attributed to J V Chandler.

7 recordsLinked to original sources
PubMed1980

Improving physical fitness by exercise training programs.

Thirteen young men completed a ten-week exercise training program on bicycle ergometers. Training sessions were conducted five days per week, with eight men randomly assigned to low-effort (LE) and five to high-effort (HE) regimens. LE participants worked continuously at 50% of their maximal oxygen intake (exercise HR congruent to 135 BPM); HE participants performed two minutes alternating work-rest intervals at 80% of their maximal oxygen intake (exercise HR congruent to 170 BPM). Total work done was held constant for the two groups. LE and HE participants increased maximal oxygen intake (P < .01), but there was no difference in changes between the two groups. LE exercise training programs are more comfortable for participants and perhaps should be recommended over HE programs for most individuals, since improvements in physical fitness appear to be comparable.

Adolescent↗
PubMed1980

The effect of amphetamines on selected physiological components related to athletic success.

Six male college students were tested under two experimental conditions; amphetamine and no amphetamine. Each subject was tested three times under each condition. A double-blind placebo-controlled approach was employed and on six consecutive Fridays the subjects received either a placebo or 15 mg of Dexedrine per 70 kg of body weight 2 hours prior to testing. The physiological components tested were strength, muscular power, running speed, acceleration, aerobic power, and anaerobic capacity. Other variables evaluated were pre-exercise and maximum heart rates, respiratory exchange ratio and time to exhaustion. Data analysis revealed significant increases in knee extension strength, acceleration, anaerobic capacity, time to exhaustion, and pre-exercise and maximum heart rates. The most revealing results were in the area of increased time to exhaustion during the Vo2max test presumably due to higher lactic acid tolerance, thus a possible rationale to substantiate the theory that this drug has the ability to mask fatigue. It may also be possible that the biochemical actions of the drug alter fatigue processes directly. The results demonstrate that amphetamines have no effect on aerobic power, but further research will be necessary to clarify the drug's influence on muscular power-dominated movements.

Acceleration↗
PubMed1978

Effects of arm training on retention of training effects derived from leg training.

This study examined the effects of arm training on retention of training effects produced by leg training. Thirteen adult male subjects leg trained on bicycle ergometers for 8 weeks. During the subsequent 4 week control period group AT (N = 4) arm trained by cranking an ergometer, group DT (N = 4) discontinued training and group LT (N = 5) continued leg training. Metabolic response to maximal and submaximal (80% initial Vo2max) leg work was observed before (Test I) and after (Test II) the 8 week leg training program and at the conclusion of the control period (Test III). With the initial 8 weeks of leg training Vo2max and maximal Ve increased while Vo2, HR, Ve and blood lactate decreased during submaximal work (p less than .05). R was decreased during both maximal and submaximal work (p less than .05). Analysis of covariance of the Test III means (Test II as covariate) yielded significant (p less than .05)F-ratios for Vo2max and R at Vo2max. Post hoc testing indicated that Vo2max was greater in LT than in AT or DT but that there was no difference between AT and DT. R at Vo2max was greater in DT than in LT or AT. These data suggest that arm training does not significantly affect the deterioration in metabolic response to leg work which occurs with cessation of leg training.

Adolescent↗
PubMedDate not supplied

Health problems in the extraterrestrial environment.

Space travel imposes unique stress on humans. Through a review of the literature, psychophysiologic alterations associated with space flight are identified. A role for space nursing is proposed.

Extraterrestrial Environment↗