• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 892
  • 490
  • 122
  • 122
  • 122
  • 122
  • 122
  • 121
  • 83
  • 71
  • 48
  • 15
  • 8
  • 3
  • 2
  • Tagged with
  • 2014
  • 2014
  • 339
  • 326
  • 125
  • 124
  • 123
  • 117
  • 104
  • 101
  • 99
  • 95
  • 85
  • 84
  • 83
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
151

The relationship between excess CO2 and blood lactate in elite cyclists

Anderson, Gregory Steven January 1988 (has links)
This study examined the relationship between expired non-metabolic CO₂ (EX CO₂) and the accumulation of blood lactate, while emphasis was placed on the ventilatory (EX CO₂ and VE/VO₂) and lactate threshold relationship. Twenty-one elite cyclists (15 males, 6 females) performed a progressive intensity bicycle ergometer test (PIT) during which ventilatory parameters were monitored on-line at 15 second intervals, and blood lactate sampling occured on each minute. Threshold values were determined for each of the three indices; excess CO₂ (EXTT), VE/V0₂ (VVTT), and blood lactate (LATT). The three threshold values (EXTT, VVTT, LATT) all correlated significantly (P<0.001) when each was expressed as an absolute VO₂ (1/min). A significant RM ANOVA (F=8.41, P<0. 001) and post hoc correlated t-tests demonstrated significant differences between the EIXTT and LATT (P<0.001) and the EXTT and VVTT values (P<0.025). The LATT occured at an average blood lactate concentration of 3.35 mmol/1, while the mean expired excess CO₂ volume at the EXTT was 14.04 ml/kg/min. Over an 11 minute range across the threshold values (EXTT and LATT), which were used as relative points of reference, the expired EXC02 volume (ml/kg/min) and blood lactate concentration (mmol/1) correlated significantly (r=0. 69, P<0. 001). Higher individual correlations over the same period of time <r=0.82 - 0.96, P <0.001) stress the individual nature of this relationship. Expired EXCO₂ volume appeared to track blood lactate levels over this 11 minute period when the significant threshold difference (1.35 min.) was taken into consideration. These results indicate a strong relationship between the three threshold values, although changes and expired EXCO₂ precede changes in blood lactate concentration and the ventilatory equivelant (VE/VO₂). Although changes in expired EXCO₂ volume appear to track changes in blood lactate concentration, blood lactate concentration can not be accurately predicted from expired EXCO₂ volume as the nature of this relationship varies between individuals and. appears to be influenced by gender. / Education, Faculty of / Curriculum and Pedagogy (EDCP), Department of / Graduate
152

The effects and extent of 1,1,1-trichloroethane vapor concentration exposure on workers during solvent vapor degreasing

Arefian, Ahmad 27 April 1981 (has links)
This study attempted to determine if an excessive amount of 1,1,1 - Trichloroethane was released into the air, the acute effects of exposure and the cause(s) of excessive use. The types of degreasing equipments which were tested in this study are straight vapor and the vapor spray machines. The instruments utilized to obtain the data for this study are Gastech Haline Detector, Organic Vapor Monitor Badge and Personal Sampling Pump. Readings were taken on three different tanks. The data accumulated by this study were obtained during actual cleaning operation. During testing, increased exposure was detected due to exceeding the rate of removal, downward drafts were blowing right over the top of a degreaser and, in some cases, poor general ventilation caused solvent vapor to be blown out of the tank and into the workers' breathing zone, affecting excessive vapor drag out and solvent loss. The results show that, since the characteristics of solvent 1,1,1 - Trichloroethane are well suited to vapor degreasing requirements, by using proper procedures and maintenance, 1,1,1 - Trichloroethane emission during vapor degreasing can be controlled at levels well below the industrial hygiene standard established by OSHA for safe and healthful conditions.
153

Tolerance to the Behavioral Effects of Methylphenidate

Brewin, Anne M. 05 1900 (has links)
Thirty-one rats were trained on a differential reinforcement of low rate schedule. After responding had stabilized, animals were injected with methylphenidate, twice weekly, presession. Methylphenidate produced dose-dependent increases in response rates and decreases in reinforcements. Repetition of these doses produced a reduced drug effect, and a third administration of the 10 mg/kg dose further reduced the drug effect. Subsequently, the effects of daily and intermittent administration were determined for this dose. Daily methylphenidate, pre-session, produced tolerance to the behavioral effects of methylphenidate and cross-tolerance to the amphetamines. Twice-weekly methylphenidate, pre-session, produced partial tolerance to methylphenidate and partial cross-tolerance to the amphetamines. Thus, periodic exposure to the behaviorally disruptive effects of a drug of the amphetamine class reduces the effects of subsequent exposure.
154

Effects of morphine on intracranial self-stimulation : the involvement of associative factors and the role of ventral tegmental dopamine neurons

Hand, Timothy Henry. January 1985 (has links)
No description available.
155

The status of beta carotene and vitamin A in Quebec dairy herds and their effects on reproductive performance /

Farmer, Bertrand. January 1985 (has links)
No description available.
156

Preference For and Tolerance to Ethanol : Acetaldehyde Involvement

Bélanger-Grou, Hélène 03 1900 (has links)
No description available.
157

Effects of colchicine and endotoxin on bovine mammary involution and natural resistance to infection during the dry period /

Oliver, Stephen Paul January 1980 (has links)
No description available.
158

Interactions of neurohypophyseal, adrenergic and estrogenic agents on the canine cardiovascular system /

Desiderio, Mary Alice January 1980 (has links)
No description available.
159

The role of calcium and dopamine membrane carrier in mediating the behavioral and biochemical effects of amphetamine /

Fung, Yiu Kai January 1980 (has links)
No description available.
160

Effects of butter and corn oil on urinary taurine and fecal bile acid excretion in healthy young women /

Kindrick, Shirley Gilliland January 1980 (has links)
No description available.

Page generated in 0.0706 seconds