Effects of Two Isometric Strength Training Methods on Jump and Sprint Performances:A Randomized Controlled Trial  

作　　者：Danny Lum Tiago M.Barbosa Ranald Joseph Govindasamy Balasekaran 

机构地区：[1]Sport Science and Sport Medicine,Singapore Sport Institute,3 Stadium Drive,Singapore 397630,Singapore [2]Physical Education and Sports Science,National Institute of Education,Nanyang Technological University,Singapore,Singapore [3]Polytechnic Institute of Braganca,Bragança,Portugal [4]Research Centre in Sports,Health and Human Development(CIDESD),Vila Real,Portugal

出　　处：《Journal of Science in Sport and Exercise》2021年第2期115-124,共10页体育运动科学（英文）

摘　　要：Purpose Isometric strength training (IST) with rapid non-sustained contraction (RIST) is effective in improving the ability to generate force rapidly.However,the neuromuscular adaptation of IST with sustained contraction (SIST) and RIST is not known.Therefore,the aim of the study was to compare the neuromuscular adaptations of RIST with SIST.Methods Thirty-three national floorball players (23.9 ± 3.1 years old;1.69± 0.08 m;64.6± 11.1 kg) were recruited for this study.Pre-and post-test included countermovement jump (CMJ),30-m sprint (TT30),isometric squat at 90° (ISqT90) and 120° (ISqT120) knee angles.They were randomly assigned to either control (Con) (n =9),RIST (n =12) or SIST (n =12)group and performed 12 sessions of intervention training.All groups performed the same sets of exercises,but RIST and SIST had to perform ISqT with and without sustained contraction,respectively.Results Time × group effect for CMJ height (P =0.01,η2p=0.25),peak force (PF) (P =0.03,η2p =0.22) and rate of force development (RFD) (P =0.02,η2p =0.22) obtained from ISqT 120 were noted.A main effect for time was observed in CMJ height,PF obtained from ISqT90 and ISqT120,and RFD obtained from ISqT90 (P < 0.01,0.27 < η2p < 0.57).There was greater improvement in TT30 (P =0.043,d =3.00),ISqT90 PF (P =0.034,d =3.12),ISqT 120 PF (P =0.003,d =4.54) and ISqT120 RFD (P=0.033,d=1.36) in the SIST than the Con group.Conclusion SIST was more effective in improving strength and dynamic performance as compared to RIST,making it a viable training method to enhance dynamic performances.

关 键 词：Countermovement jump Isometric squat Peak force Rate of force development 

分 类 号：G822[文化科学—体育训练]