EFFECTS OF CARDIOVASCULAR FITNESS AND BODY COMPOSITION ON MAXIMAL CORE TEMPERATURE IN COLLEGIATE FOOTBALL PLAYERS DURING PRESEASON

摘要

This study evaluated the effects of body mass index (BMI) and aerobic fitness ((V)over dotO(2)max) on maximal core temperature values (T-cmax) in 17 National Collegiate Athletic Association Division III football players during preseason. The subjects included 9 backs (BKs) and 8 linemen (LM). (V)over dotO(2)max testing was performed 1 week before preseason. Core temperature was monitored by ingestible sensor every 10 minutes during practices on day 4 (D1), day 5 (D2), day 7 (D3), and postacclimatization on day 14 (D4). Wet bulb globe temperature (WBGT) was recorded on each collection day. Independent, paired t-tests and Pearson's correlations were performed (alpha = 0.05). There were no significant correlations between (V)over dotO(2)max and T-cmax on D1 (WBGT = 29.07 degrees C) or D2 (WBGT = 30.93 degrees C), but on D3 (WBGT = 31.39 degrees C) there was a nonsignificant moderate negative correlation (r = -0.564, p = 0.090). There were no significant correlations between BMI and T(cmax )on D1 or D2, but on D3 there was a nonsignificant moderate positive correlation (r = 0.596, p = 0.069). Paired t-tests revealed that overall T-cmax (D1-3) (38.56 +/- 0.32 degrees C) was statistically higher (p = 0.002) than D4 (38.16 +/- 0.30 degrees C). Independent t-tests between groups showed that the T cmax values during preacclimatization (D1-D3) were significantly higher in LM (38.50 +/- 0.37 degrees C) than BKs (38.16 +/- 0.35 degrees C) (p = 0.007). Vo 2 max was significantly lower (p = 0.006) in LM (36.89 +/- 6.40 ml.kg(-1).min(-1) ) than BKs (47.44 +/- 7.09 ml.kg(-1). min(-1)), and BMI was significantly higher (p = 0.019) in LM (35.59 +/- 4.00 kg.m(-2)) than BKs (28.68 +/- 3.38 kg.m(-)(2) ). The results of this study demonstrate that LM are significantly less fit than BKs and have a greater BMI. When WBGT was the highest on D3, the results suggest that those with lower (V)over dotO(2)max and higher BMI experienced a higher T-cmax.