How Accurate Are Coaches In Predicting Perceived Exertion Of Their Athletes?

Abstract

concentrations were determined using ELISA. Heart rate (HR), gastrointestinal temperature (Tgi), physiological strain index (PSI) and changes in blood biomarkers were assessed using 2-way ANOVA and paired Student's t-test with p<0.05 as statistically significant. RESULTS: Participants observed similar baseline Tgi (37.0 ± 0.2ºC; p=0.910) and HR (69 ± 7 bpm; p=0.469). After ingestion at rest, Tgi was lower in ICE (36.5 ± 0.2ºC) compared to AMB (36.9 ± 0.2ºC, p<0.001). Tgi was similar post-FDE (ICE:38.4 ± 0.4ºC, AMB: 38.6 ± 0.3ºC; p=0.196) and post-ECT (both 39.5 ± 0.5ºC; p=0.976). PSI for FDE (ICE: 5.6 ± 0.6, AMB: 5.5 ± 0.7; p=0.652) and ECT (ICE: 6.8 ± 1.0, AMB: 6.9 ± 1.0; p=0.668) were also similar. ECT run times for ICE (48 ± 13 min) and AMB (45 ± 13 min; p=0.142) did not differ. Serum cortisol concentrations were similar at baseline (5.1 ± 2.7 ug/dL, p=0.840) and post-FDE (4.4 ± 3.1 ug/dL, p=0.804). Post-ECT serum cortisol concentrations were lower in ICE (7.8 ± 2.5 ug/dL) than AMB (9.7 ± 3.1 ug/dL, p=0.03). Serum concentrations of i-FABP, LPS and IL-6 were similar at baseline, post-FDE and post-ECT (p>0.05). CONCLUSION: Ice slurry ingestion before and during exercise reduces serum cortisol levels via mechanisms independent from the physiological strain incurred during exercise.