Abstract
Running Energy Reserve Index (RERI) has been proven to be an accurate method in predicting the run performances from sprint to middle distance (Balasekaran et al., 2011). However, none of the studies have compared the results of RERI with hematological measures. PURPOSE: To compare RERI of endurance trained (ET) and sprint trained (ST) athletes with hematological measures. METHODS: Nine ST(age = 26.89±9.39 years, VO2max = 51.12±3.59, BMI = 23.09±2.07 kg•m-2) and 12 ET(age = 31.67±7.24 years, VO2max = 57.62±5.40, BMI = 21.34±1.27 kg•m-2) participants were recruited. Venous blood was taken from the antecubital vein via the venepuncture procedure to determine hematological measures. RERI is a ratio of maximal aerobic energy (EMAS) and maximal anaerobic energy (EMAnS) corresponding to maximal aerobic speed (MAS) and maximal anaerobic speed (MAnS) respectively. To determine MAS, athletes performed six laboratory tests as follows: Astrand modified running protocol, submaximal discontinuous treadmill protocol, exhaustion (Tlim) tests at vV†O2max and at Vsub%95 (νΔ50 or νΔ50+5%vV†O2max), and speed and duration curve protocol. To determine the MAnS, athletes performed a 50m sprint run test on the track. The EMAS and EMAnS were determined at corresponding maximal speeds with a submaximal efficiency equation. A linear regression analysis was employed to determine velocity at lactate threshold (vLT), and the speed-V†O2 relationship to calculate vV†O2max, EMAS, and EMAnS. The Independent t test was employed to compare RERI and hematological measures between ET and ST athletes. RESULTS: There were significant differences between ET and ST for VO2max and BMI (p ≤ .05). The results of hematological measures such as haemoglobin (Hb; g•dl-1) and hematocrit (%Hct) were significantly higher (p ≤ .05) among ST athletes (Hb: 15.50±.46, %Hct: 45.59±1.34) compared to ET athletes (Hb: 14.79±.78, %Hct: 43.51±2.30). However, the proportion of plasma volume (PV) was significantly higher (p ≤ .05) among ET athletes (56.49±2.30) than ST athletes (54.41±1.34). Similarly, RERI (2.65±0.13) of ST athletes was significantly higher (p ≤ .001) than ET athletes (1.85±0.14). CONCLUSIONS: RERI significantly differentiated the endurance and sprint trained athletes and these differences may be attributed to hematological variables. RERI can be used easily to detect differences in cohorts based on the type of training: Endurance versus Sprint.
Published Version
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