UVM Theses and Dissertations
Format:
Print
Author:
Rink, Abigail Lydia
Dept./Program:
College of Education and Social Services
Year:
2005
Degree:
M. Ed.
Abstract:
Purpose: To examine the effects of elevated core body temperature to the individual's critically attained level during maximal exercise and the effect on maximal oxygen consumption (V0[subscript2]max) and time to exhaustion during cycle ergometry. Methods: Fourteen healthy subjects, 11 male and 3 female (age = 22.7± 4.7 years, height = 174.80 ± 9.88 cm, weight = 71.56 ± 10.07 kg, percent body fat = 14.4 ± 7.69 %, lean body mass (LBM) = 61.09 ± 8.97 kg) with no apparent cardiovascular medical history were recruited for this study. Each subject performed a progressive bout of exercise to exhaustion on a stationary bicycle for the measurement of maximal oxygen consumption (V0[subscript2]max). With a minimum of 48 hours in between visits, the subjects were asked to return for a second visit to perform a time to exhaustion test, conducted at a work-rate of 85% of the ending resistance during the previous V0₂max test. Core body temperature (T[subsript re]) at the point of fatigue was recorded for both trials. The third and fourth visits involved a repetition of the two tests, respectively, with time in a hot tub bath prior to each bout of exercise until critically attained level T[subscript re] was reached, previously determined during the initial two trials.
Results: With an alpha level set at P <0.05, a paired Students' T-Test compared means between the control and the tests performed at an elevated core body temperature and indicated a significant decrease in time to fatigue (T of 3.690, P = 0.003). Conversely, paired T-Tests demonstrated a lack of significance between V0₂max control results and V0₂max under hypertherrnic conditions (T = 0.626, P = 0.542). Maximum heart rate (HR[subscript max]) during the control and elevated core body temperature tests for V0₂max did not indicate a significant change (T = 0.070, P = 0.945), and although HR[subscript max] during the time to exhaustion trials did show elevated trends during the hypertherrnic tests, the results were not significant (P = 1.408). Conclusion: Elevating body temperature to one's critically attained level significantly decrease time to exhaustion during submaximal exercise.
Results: With an alpha level set at P <0.05, a paired Students' T-Test compared means between the control and the tests performed at an elevated core body temperature and indicated a significant decrease in time to fatigue (T of 3.690, P = 0.003). Conversely, paired T-Tests demonstrated a lack of significance between V0₂max control results and V0₂max under hypertherrnic conditions (T = 0.626, P = 0.542). Maximum heart rate (HR[subscript max]) during the control and elevated core body temperature tests for V0₂max did not indicate a significant change (T = 0.070, P = 0.945), and although HR[subscript max] during the time to exhaustion trials did show elevated trends during the hypertherrnic tests, the results were not significant (P = 1.408). Conclusion: Elevating body temperature to one's critically attained level significantly decrease time to exhaustion during submaximal exercise.