Masters Thesis

The effect of dehydration, hyperthermia, and fatigue on landing error scoring system scores

Purpose: To examine the effects of exercise-induced dehydration, hyperthermia, and fatigue on Landing Error Scoring System (LESS) scores during a jump-landing task, and the effectiveness of a personalized hydration plan. Methods: Five recreationally active heat-acclimatized males 25.4 y (SD=5.7) completed two trials: with fluid replacement, (EXP) and without fluid (CON), in a counterbalanced, randomized, cross-over fashion. Exercise was terminated when gastrointestinal temperature (Tgi) = 39.5°C and fatigue ≥ 7/10, or 90 min of exercise. Percent dehydration was determined by body mass change from pre- exercise (PRE) and post-exercise (POST). Tgi, heart rate (HR), and perceived fatigue were measured PRE, during exercise, and POST. Three jump-landing tasks were filmed in the frontal and sagittal planes. An experienced grader evaluated jump-landing tasks using the LESS. Statistical Analysis: Repeated measures ANOVA assessed primary dependent and independent variables while a priori dependent t-tests evaluated pairwise comparisons. Results: No interaction, group, or time main effects were observed for LESS scores (p=0.437). POST dehydration (%) was greater in CON (M=2.59, SD=0.52) vs. EXP (M=0.92, SD=0.41; p0.001), whereas hyperthermia (°C) (CON, M=39.29, SD=0.31, EXP, M=39.03, SD=0.61; p=0.425), and fatigue (CON, M=9, SD=1, EXP, M=9, SD=2; p=0.424) were similar. Conclusion: LESS scores were not affected by exercise-induced dehydration, hyperthermia, and fatigue, nor by a personal hydration plan.

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