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High-Intensity Interval Training Prescribed Within the Secondary Severe-Intensity Domain Improves Critical Speed But Not Finite Distance Capacity

引用

Journal of Science in Sport and Exercise 2020年第2期2卷 154-166页

作者： emma jthomas Robert W.Pettitt Mark Kramer Biokinetics and Sport Science Unit Nelson Mandela UniversityPort Elizabeth 6070South Africa Rocky Mountain University of Health Professions ProvoUT 84606USA Physical Activity Sport and Recreation Research Focus AreaNorth West UniversityPotchefstroom 2520South Africa

Purpose Improvements in D'(the fatigability constant for running)subsequent to training interventions remain ***-intensity interval training(HIIT)within the severe intensity domain for short durations(<2-min)have been theorized to improve D'.The purpose of the present study was to assess this in a group of moderately trained *** Eighteen participants completed graded exercise testing(GXT),40-m sprint testing and a 3-min all-out test(3MT)for running to determine key mechanistic and physiological *** were randomly assigned into one of two groups based on intensity prescription(G140%=140%of critical speed[CS]),or time intervals(G90-s=90-s)to complete a twice-weekly training intervention for 6-weeks followed by *** No between-group differences were present either prior to or following the *** and meaning-ful improvements were detected during the post-intervention period for both groups for VO2max(G140%:+7.60%;G90-s:+11.67%),speed evoking VO2max(sVO2max;G140%:+4.33%;G90_s:+2.92%),gas exchange threshold(GET;G140%:+12.02%;G90-s:+20.52%),speed evoking GET(sGET;G140%:+4.17%;G90_s:+7.92%),CS(G140%:M=0.62 m/s;G90-s:M=0.46 m/s),D'(G140%:M=-56.34 m;G90-s:M=-18.36 m),FI%(G140%M=-6.75%;G90-s:M=-4.38%)and maximal distance(G140%:M=49.67 m;G90_s:M=58.38 m).Conclusions The prescribed intensities and durations were insufficient to elicit improvements in D'.Improvements in D'may be dependent on very short-duration intervals(i.e.<60 to 90-s)at speeds exceeding 140%CS but below maximal sprint speed.

关键词： Moderately active Severe intensity Threshold

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