PHYSIOLOGICAL AREA   

Medicina dello Sport 2018 June;71(2):164-73

DOI: 10.23736/S0025-7826.18.02824-7

Copyright © 2018 EDIZIONI MINERVA MEDICA

language: English, Italian

Comparison of two methods for determination of core temperature during running velocity at maximal lactate steady state

Halit HARMANCI ✉, Mihri B. KARAVELIOĞLU, Mert KAYHAN, Bolat GÜNDÜZ

Department of Physical Education and Sport, Dumlupınar University, Kütahya, Turkey

BACKGROUND: The purpose of this study was to compare of telemetric monitoring system and tympanic device for determination of core temperature during running velocity at maximal lactate steady state.
METHODS: Fifteen15 healthy female futsal players volunteered to participate in this study. The mean age, height and weight of athletes were 20.14±0.82 years, 165.45±4.30 cm and 57.96±6.54 kg, respectively. Two separate test protocol was applied to participants. Firstly, each subject performed an intermittent incremental test on the treadmill for determination of lactate threshold at 4 mmol∙l-1 lactate concentration. During test, the initial velocity of 7.0 km∙h-1 was increased by 1.0 km∙h-1 every 3 min until volitional exhaustion. Secondly, maximal lactate steady state (MLSS) of the athletes was determined by a serious of 30 minutes constant-speed treadmill runs. MLSS was defined as the highest lactate concentration that increased by no more than 1 mmol∙l−1 between the 10th and 30th minute of the submaximal treadmill test. Core temperatures of the subjects were measured by both a telemetric monitoring system (Tm) and tympanic device (Td) at rest and at 10 min intervals throughout the MLSS Test.
RESULTS: Paired-sample t-test was conducted to evaluate the significance of mean differences in devices before and during the MLSS Test. While there were no significant differences in core temperature values between Tm and Td at rest (P>0.05), Td was lower than Tm after 10th, 20th, and 30th min of exercise (P<0.05). Multiple regression analysis was used to create a new formula with tympanic device for guess core body temperature according to telemetric monitoring device during the MLSS Test.
CONCLUSIONS: These methods to determine core body temperature include tympanic and gastrointestinal measurement can be used in future studies.

KEY WORDS: Running - Body temperature - Exercise test