Effect of beta-blockade on the drift in O2 consumption during prolonged exercise

Kalis, J. K.; Freund, B. J.; Joyner, M. J.; Jilka, S. M.; Nittolo, J.; Wilmore, Jack H.

doi:10.1152/jappl.1988.64.2.753

Cited by 29 publications

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“…Kalis et al reported that the contribution of the increase in RT (exercise-induced hyperthermia) to the increase in VO 2 was the largest (37% of the increase in VO 2 ) (22). Because muscle temperature and core body temperature increase similarly during dynamic exercise (3), the difference in RT between dehydration and euhydration trials in this study at the completion of exercise might account in part for the difference in VO 2 .…”

Section: Cardiovascular Responsesmentioning

confidence: 58%

The Different Effects of Fluid with and without Carbohydrate Ingestion on Subjective Responses of Untrained Men during Prolonged Exercise in a Hot Environment

Ishijima

Hashimoto

Satou³

et al. 2009

J Nutr Sci Vitaminol

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SummaryThis study examined the effects of maintaining euhydration by ingesting fluids with or without carbohydrate on subjective responses of untrained men during prolonged exercise in a hot environment. Six healthy untrained subjects completed 90 min of cycling exercises at 55% maximal oxygen consumption (V O 2 max ) in a hot environment (temperature: 28˚C, humidity: 50%) under three different experimental conditions. During the first trial, subjects did not ingest fluids during exercise (dehydration (DH) trial). In the second and third trials, subjects received mineral water (MW) and hypotonic fluid containing carbohydrate (HF), respectively, in amounts equaling their weight loss in the DH trial. At the end of exercise, the overall rating of perceived exertion (RPE-O) was lower in the MW and HF trials than in the DH trial (14.3 Ϯ 1.0 and 13.7 Ϯ 0.6 vs 17.7 Ϯ 1.0, p Ͻ 0.05, respectively). RPEcardiovascular and RPE-legs were lower at the end of exercise in the HF trial compared with the DH trial. V O 2 , heart rate (HR), and rectal temperature increased during exercise in the three trials. At the end of exercise, the drift in V O 2 was lower in the MW and HF trials than in the DH trial (304 Ϯ 41 and 339 Ϯ 40 vs 458 Ϯ 33 mL, p Ͻ 0.05, respectively). HR at the end of exercise in the HF trial was lower than in the DH trial (158 Ϯ 5 vs 173 Ϯ 7 bpm, p Ͻ 0.05). These results suggest that maintaining euhydration during prolonged exercise in untrained men could attenuate RPE-O and that hypotonic electrolyte-carbohydrate solution could attenuate RPE-legs during exercise. Key Words maintaining euhydration, perceived exertion, prolonged exercise, heat exposure Dehydration, hyperthermia and muscle glycogen depletion are the major determinant factors that induce the reduction of performance during prolonged exercise. Fluid ingestion, especially in a hot environment, attenuates hyperthermia and cardiovascular drift ( 1-4 ), and carbohydrate ingestion reduces the rating of perceived exertion (RPE) during prolonged exercise in endurance-trained subjects ( 5-10 ). However, there is no available data about the physiological and subjective benefits of maintaining body water by ingesting fluid with or without carbohydrate supplementation during prolonged submaximal exercise in untrained healthy subjects.Maintaining euhydration by fluid ingestion attenuates cardiovascular strain induced by both hyperthermia and dehydration during prolonged submaximal exercise in the heat ( 2-4 ). Gonzalez-Alonso et al. suggested that despite a marked cardiovascular drift at the 120 min of exercise, corresponding to ~60% maximal oxygen consumption (V O 2 max ) in a dehydration trial, the increase in V O 2 for exercising and nonexercising muscle of the whole body was similar to a euhydration trial ( 2 ). Additionally, it has been demonstrated that during prolonged exercise an increase in carbohydrate availability by carbohydrate supplementation attenuated RPE ( 8 , 9 , 11 ) while fluid ingestion did not attenuate the RPE ( 4 , 12 ). However, these stu...

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Section: Cardiovascular Responsesmentioning

confidence: 58%

The Different Effects of Fluid with and without Carbohydrate Ingestion on Subjective Responses of Untrained Men during Prolonged Exercise in a Hot Environment

Ishijima

Hashimoto

Satou³

et al. 2009

J Nutr Sci Vitaminol

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show abstract

“…A decrease in blood volume from pre to post workout can be attributed to water loss from sweating and a compartmental shift of water from plasma to interstitial fluide A compartmental shift of 250 ml of water occurs within 10 minutes from the onset of exercise (Nielson et al 1984). As weIl, a withdrawal of parasympathetie tone was probable (Kalis et al 1988). …”

Section: Discussionmentioning

confidence: 88%

“…These mechanisms include an increase in heart rate to compensate for decreasing stroke volume, an increase in core temperature as a result of thermal stress, an increase in blood catecholamines, a change in substrate utilization with an increase in fat metabolism resulting from a decrease in muscle and liver glycogen, and 8 a decrease in biomechanical efficiency, (Bailey and Pate 1991;Kalis et al 1988;Morgan and Craib 1992;Williams and Cavanagh 1987).…”

Section: Discussionmentioning

confidence: 99%

“…Following prolonged activity, increases in va! have been associated with increases in heart rate, core temperature, fat catabolism and blood catecholamines as weIl as decreases in biomechanical efficiency, muscle glycogen and liver glycogen content (Bailey and Pate 1991;Kalis et al 1988;Morgan and Craib 1992;Williams and Cavanagh 1987). In contrast, sorne studies have shown that long duration runs at 74 to 90% of VO Zmu did not alter RE (Dressendorfer 1991;Martin et al 1987;Morgan et al 1990.…”

Section: Introductionmentioning

confidence: 99%

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Effect of intense interval workouts on running economy using three recovery durations

Zavorsky

Montgomery

Pearsall

1998

European Journal of Applied Physiology

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, sorne thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of tbis reproduction is dependent upon tbe quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will he noted. Also, if unauthorized copyright material had ta he' removed, a note will indieate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing from left ta right in equai sections with smaII overlaps. Each original is aIso photographed in one exposure and is included in reduced form at the back of the book.Photographs included in the original manuscript have been reprodueed xerographically in tlûs eopy. Higher quality 6" x 9" black and white photographie prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact lTh1I directly to order. The author bas granted a nonexclusive licence allowing the National Library of Canada to reproduce, loan, distribute or sell copies of this thesis in microform, paper or electronic formats. DMIThe author retains ownership of the copyright in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author' s penmSSlon.L'auteur a accordé une licence non exclusive permettant à la Bibliothèque nationale du Canada de reproduire, prêter, distribuer ou vendre des copies de cette thèse sous la forme de microfiche/film, de reproduction sur papier ou sur format électronique.L'auteur conserve la propriété du droit d'auteur qui protège cette thèse.Ni la thèse ni des extraits substantiels de celle-ci ne doivent être imprimés ou autrement reproduits sans son autorisation. 0-612-29521-4Canad~ ABSTRACTThe purposes of this study were to determine if (1) RE is adversely affected by intense interval bouts of 10 x 400-m, and (2) if there is an interaction effect between RE and recovery duration during the workouts. Twelve highly trained male runners (VO:!max = 72.5 ± 4.3 ml-kg-'min-' ) performed 3 interval workouts of 10 x 400-m with a minimum of 4 days between runs. Recovery between repetitions was randomly assigned at 60, 120or 180 s. The velocity for each 4oo-m run was determined from a treadmill V0 2max test.The average running velocity was 357.9 ± 9.0 mmin-I .

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“…O 2 during submaximal exercise has been reported to be either increased [80,81] or unchanged [82] by the elevation of body temperature. The studies, which reported an increase in V .…”

Section: Body Temperaturementioning

confidence: 99%

Oxygen Uptake Kinetics During Exercise

1999

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Effect of beta-blockade on the drift in O2 consumption during prolonged exercise

Cited by 29 publications

References 0 publications

The Different Effects of Fluid with and without Carbohydrate Ingestion on Subjective Responses of Untrained Men during Prolonged Exercise in a Hot Environment

The Different Effects of Fluid with and without Carbohydrate Ingestion on Subjective Responses of Untrained Men during Prolonged Exercise in a Hot Environment

Effect of intense interval workouts on running economy using three recovery durations

Oxygen Uptake Kinetics During Exercise

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