Anmelden/Registrieren
Zurück zur geteilten Ansicht
Verfasser Titel Jahr
zeige Details Morris, J. G.. Muscle Metabolism, Temperature, and Function During Prolonged, Intermittent, High-Intensity Running in Air Temperatures of 33 ° and 17 °C
In: International journal of sports medicine. - Stuttgart [u.a.] : Thieme Vol. 26, No. 10 (12. 2005), p. 805-814
Zugang: zum Volltext
ähnliche Vorschläge
2005
Nine unacclimatized university sportsmen performed a prolonged, intermittent, high-intensity shuttle running test in hot (HT) (33 °C, dry bulb temperature, ∼ 28 %, relative humidity) and moderate (MT) (17 °C, 63 %) environmental conditions. Subjects performed 60 m of walking, a 15-m sprint, 60 m of cruising (∼ 85 % V·O 2max), and 60 m of jogging (∼ 45 %V·O 2max) for 14.8 ± 0.1 min followed by a 3-min rest, repeated until volitional exhaustion. The hot trial was performed first followed, 14 days later, by the moderate trial. During exercise subjects drank water AD LIBITUM. Subjects ran almost twice as far in the moderate as in the hot trial (HT 11216 ± 1411, MT 21644 ± 1629, m, p < 0.01), and the decline in average 15-m sprint performance was greater in the heat (HT, 0.17 ± 0.05, MT, 0.09 ± 0.03, s, p < 0.05). Average heart rates, blood lactate and glucose, and plasma adrenaline and noradrenaline concentrations were greater in the HT (main effect trial, p < 0.01), as were serum cortisol concentration (main effect trial p < 0.05, n = 5) and muscle temperature (HT exhaustion vs. same time point in MT, 40.2 ± 0.3 vs. 39.3 ± 0.2, °C, p < 0.01). Peak torque during knee flexion and extension was not different pre-and post-exercise in the HT. Muscle glycogen utilization tended to be greater in the heat (HT 193.2 ± 19.5, MT 143.8 ± 23.9, mmol · kg dry wt -1, p = 0.055, n = 8). In 7 out of the 8 subjects the increase in utilization was between 19 and just over 200 % greater in the HT. Glycogen remaining in the muscle at exhaustion was greater in the hot than moderate trial (HT 207.4 ± 34.3, MT 126.5 ± 46.8, mmol · kg dry wt -1, p < 0.01, n = 8). Rectal temperature (T rec) was higher in the HT at exhaustion than at the same point in time in the moderate trial (HT, 39.60 ± 0.15 vs. MT 38.75 ± 0.10, °C, interaction trial-time, p < 0.01). There was a very strong negative relationship between rate of rise in T rec and distance completed in the HT (HT r = - 0.90, p < 0.01, MT r = - 0.76, p < 0.05). Thus, the earlier onset of exhaustion during prolonged intermittent shuttle running in the heat is associated with hyperthermia. However, while muscle glycogen utilization may be elevated by heat stress, low whole muscle glycogen concentrations would not seem to be the cause of this earlier exhaustion..
1. Verfasser: Morris, J. G..
beteiligte Personen: Boobis, L. H., , Macdonald, I. A.. , Nevill, M. E., , Williams, C..
Format: Elektronisch
Sprache: English
Erschienen: Stuttgart ; New York : Georg Thieme Verlag, 2005.
Schlagwörter:
URL: http://dx.doi.org/10.1055/s-2005-837448

Ähnliche Vorschläge

Zurück zur geteilten Ansicht
Verfasser Titel Jahr
zeige Details Chaplin, Susan B. The physiology of hypothermia in the black-capped Chickadee,Parus atricapillus
in: Journal of comparative physiology , ISSN 1432-136X, Vol. 112 (3. 1976), p. 335-344
Zugang: zum Volltext
ähnliche Vorschläge
1976
zeige Details Morris, J. G.. Muscle Metabolism, Temperature, and Function During Prolonged, Intermittent, High-Intensity Running in Air Temperatures of 33 ° and 17 °C
In: International journal of sports medicine. - Stuttgart [u.a.] : Thieme Vol. 26, No. 10 (12. 2005), p. 805-814
Zugang: zum Volltext
ähnliche Vorschläge
2005
zeige Details Morris, J. G.., Nevill, M. E.., ... Muscle Metabolism, Temperature, and Function During Prolonged, Intermittent, High-Intensity Running in Air Temperatures of 33 ° and 17 °C
in: International journal of sports medicine. - Stuttgart [u.a.] : Thieme, ISSN 1439-3964, Vol. 26, No. 10 (2005), p. 805-814
Zugang: zum Volltext
ähnliche Vorschläge
2005
zeige Details Krause, U., Wegener, G. Control of adenine nucleotide metabolism and glycolysis in vertebrate skeletal muscle during exercise
in: Cellular and molecular life sciences , ISSN 1420-9071, Vol. 52 (5. 1996), p. 396-403
Zugang: zum Volltext
ähnliche Vorschläge
1996
zeige Details Morris, John G., Nevill, Mary E., ... Physiological and metabolic responses of female games and endurance athletes to prolonged, intermittent, high-intensity running at 30° and 16°C ambient temperatures
in: European journal of applied physiology , ISSN 1439-6327, Vol. 81 (1/2. 2000), p. 84-92
Zugang: zum Volltext
ähnliche Vorschläge
2000