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Biomedical subjects

R T Hermiston

Publications and source records attributed to R T Hermiston.

11 recordsLinked to original sources
PubMed1983

The acute effects of controlled breathing swimming on glycolytic parameters.

Hypoxic Training, which has been popular in swimming for the past few years, is more correctly called Controlled Breathing Swimming (CBS). This study investigated the acute effects of CBS on blood glucose (GL), lactate (LA), pH, PvCO2, and recovery oxygen uptake. Six male swimmers were studied in two separate swimming sessions using two breathing patterns--free breathing (FB), and 7-stroke breathing (7B). For each session venous blood samples were drawn prior to the swim (Rest), immediately after the swim (IA), and during the 6th minute of recovery (6-R). Analyses for GL, LA, pH, and PvCO2 were carried out, and recovery VO2 (20 minutes) was calculated. Significant increased due to the exercise sessions themselves were found in both GL (p less than 0.05), and LA (p less than 0.05) concentrations. Between the two swim protocols, no significant difference was observed except for a significantly greater % CO2 production after the 7B swim (p less than 0.05). These results indicated that the acute CBS did not induce more glycolytic metabolic activity than did the normal swimming protocol.

Adolescent↗
PubMed1980

Exercise VO2 estimation using recovery sampling.

Various situations present a challenge to determine oxygen uptake (VO2) accurately simply because of the restrictions imposed by the equipment employed. This investigation was undertaken to 1) compare a select number of recovery VO2 measurements with respect to their accuracy in estimating actual exercise VO2 and 2) to determine whether absolute workload or VO2max affect this relationship. Fifteen subjects [8 highly trained (HT), VO2max +/- SD = 70.2 +/- 3.5 ml/kg . min-1 and 7 untrained (UT), VO2max = 49.7 +/- 3.8 ml/kg . min-1] completed a number of 5 min workbouts on a bicycle ergometer at 25-70% VO2max (VO2 = .899--3.879 l . min-1). VO2 and VCO2 (l . min-1) were monitored continuously throughout the exercise and for 5 min of recovery via a breath-by-breath system. The results indicated that 1) exercise VO2 +/- Sy.x can be estimated from several recovery collection periods, the first breath y = .953X + .441 +/- .319, the first two breaths y = 1.046X + .327 +/- .270, the first three breaths y = 1.089X + .260 +/- .241, and the second three breaths y = 1.101X + .387 +/- .234, and 2) VO2max does not affect this relationship (p greater than 0.05) while increasing absolute workload produces a greater exercise VO2 underestimation (p less than 0.05). It was concluded that using this method exercise VO2 can be estimated with reasonable accuracy (Sy.x = .234--.319, r = .92--.94, p less than 0.01).

Adult↗
PubMed1979

Three hockey skills tests as predictors of hockey playing ability.

The purpose of this study was to compare the test result times of 3 different hockey skills with the individual player ratings of coaches. By making these comparisons to the control rating, each test was evaluated as a predictor of hockey ability. The hockey players were all between the ages of 12 and 20 years of age and all 90 players were competitive team players. The three hockey skills tests were: the Illinois Agility Skate, the Finnish Skills Test, and the Hermiston Hockey Ability Test. Each player was allowed 3 trials and the best times were recorded in all cases. The preliminary results indicate that the Hermiston Hockey Ability Test was the best predictor (r = .7) with the results of the other two tests showing a coefficient of correlation of approximately 0.5. It was therefore concluded that in a competitive team of hockey, players' ability can best be assessed by using the Hermiston Hockey Ability Test. The two other tests were not as successful in their prediction of ability when compared to the criterion variable of coaches' ratings.

Adolescent↗
PubMed1977

Physiological profile of professional fire fighters.

This investigation assessed the physical characteristics, functional capacities, and body composition of 45 professional fire fighters, aged 23 through 49 years. Maximum oxygen uptake (VO2), Recovery Oxygen Uptake, arm and leg strength, all showed a negative linear relationship with age. On the other hand, percent body fat increased with age from 18% to 21%. Hand grip strength did not decline significantly as the grip strength values remained fairly constant for all of the fire fighters. Most of the data collected were considered to be within the normal range of the sedentary North American population. It was concluded from these data that professional fire fighters might well benefit from a training program designed to develop and maintain a higher level of personal fitness.

Aerobiosis↗
PubMed1975

The influence of varying oxygen tensions in inspired gas on 133Xenon muscle clearance and fatigue levels during sustained and dynamic conctractions.

Isometric and isotonic endurance levels of both elbow flexors and knee extensors were tested during inspired gas mixtures of ca. 10%, 21% or 100% oxygen in nitrogen. The four work loads were set a 25, 50, 60 and 70% of maximal volitional isometric strength (IS). The isotonic exercise routine was carried out using weight lifting techniques of 20 repetitions per min from 75 degrees to 105 degrees of elbow flexion and knee extensions respectively. Prior to, during, and after the endurance experiments 133Xe clearance was monitored by light weight scintillation counters. A depot of 0.1 to 0.2 ml of isotonic saline containing 50 to 150 muCi of the isotope was used as an intramuscular tracer. The exercise clearance values varied inversely to the test load during isometric exercise. Isotonic exercise for both elbow flexors and knee extensors showed increasing clearance values up to 60% IS. Above this level a decrease in total clearance was recorded. Oxygen tension had no statistical effect on the clearance values. However, the relatively large scatter of the 133Xe clearance method, and an inhomogenous perfusion of skeletal muscle may have masked any anticipated effect of the various O2 tensions. Variations due to the raised intramuscular pressure appeared to be much more dominant than the hypothezised variation due to the 3 set oxygen tensions.

Adult↗
PubMed1975

Serial determination of cardiac output during prolonged work by a CO2-rebreathing technique.

Cardiac outputs were calculated on eight male college students while walking on a treadmill at controlled heart rate levels. The heart rate levels were maintained through the use of a heart rate controller (Quinton Model AI-607), standard deviations for heart rate in beats/min ranged from +/-2.1 at the heart rate level 110 to +/-3.2 at 170. Test-retest correlations of the cardiac output values at the various heart rate levels were: at heart rate 110, 0.66 after 7 min and 0.85 at 30 min; at heart rate 150, 0.92 after 7 min and 0.68 at 30 min; at heart rate 130, 0.97 after 7 min, and at heart rate 170, 0.85 after 7 min. The calculated cardiac output values when plotted against oxygen uptake compare favorably with published reports. The data collected demonstrate that the CO2-rebreathing method used in the present investigation provides a reliable bloodless technique for determining multiple cardiac output during prolonged work of varied intensities.

Adult↗