PMID- 33186894
OWN - NLM
STAT- MEDLINE
DCOM- 20210521
LR  - 20220106
IS  - 1555-0273 (Electronic)
IS  - 1555-0265 (Linking)
VI  - 16
IP  - 1
DP  - 2021 Jan 1
TI  - Effectiveness of Accentuated Eccentric Loading: Contingent on Concentric Load.
PG  - 66-72
LID - ijspp.2019-0769 [pii]
LID - 10.1123/ijspp.2019-0769 [doi]
AB  - PURPOSE: To identify acute effects of a single accentuated eccentric loading 
      (AEL) repetition on subsequent back-squat kinetics and kinematics with different 
      concentric loads. METHODS: Resistance-trained men (N = 21) participated in a 
      counterbalanced crossover design and completed 4 protocols (sets x repetitions at 
      eccentric/concentric) as follows: AEL65, 3 x 5 at 120%/65% 1-repetition maximum 
      (1-RM); AEL80, 3 x 3 at 120%/80% 1-RM; TRA65, 3 x 5 at 65%/65% 1-RM; and TRA80, 3 
      x 3 at 80%/80% 1-RM. During AEL, weight releasers disengaged from the barbell 
      after the eccentric phase of the first repetition and remained off for the 
      remaining repetitions. All repetitions were performed on a force plate with 
      linear position transducers attached to the barbell, from which eccentric and 
      concentric peak and mean velocity, force, and power were derived. RESULTS: 
      Eccentric peak velocity (-0.076 [0.124] m.s-1; P = .01), concentric peak force 
      (187.8 [284.4] N; P = .01), eccentric mean power (-145.2 [62.0] W; P = .03), and 
      eccentric peak power (-328.6 [93.7] W; P < .01) during AEL65 were significantly 
      greater than TRA65. When collapsed across repetitions, AEL65 resulted in slower 
      eccentric velocity and power during repetition 1 but faster eccentric and 
      concentric velocity and power in subsequent repetitions (P </= .04). When comparing 
      AEL80 with TRA80, concentric peak force (133.8 [56.9] N; P = .03), eccentric mean 
      power (-83.57 [38.0] W; P = .04), and eccentric peak power (-242.84 [67.3] W; P < 
      .01) were enhanced. CONCLUSIONS: Including a single supramaximal eccentric phase 
      of 120% 1-RM increased subsequent velocity and power with concentric loads of 65% 
      1-RM, but not 80% 1-RM. Therefore, AEL is sensitive to the magnitude of 
      concentric loads, which requires a large relative difference to the eccentric 
      load, and weight releasers may not need to be reloaded to induce performance 
      enhancement.
FAU - Merrigan, Justin J
AU  - Merrigan JJ
FAU - Tufano, James J
AU  - Tufano JJ
FAU - Falzone, Michael
AU  - Falzone M
FAU - Jones, Margaret T
AU  - Jones MT
LA  - eng
PT  - Journal Article
DEP - 20201112
PL  - United States
TA  - Int J Sports Physiol Perform
JT  - International journal of sports physiology and performance
JID - 101276430
SB  - IM
MH  - *Athletic Performance
MH  - Biomechanical Phenomena
MH  - Cross-Over Studies
MH  - Humans
MH  - Male
MH  - *Muscle Strength
MH  - Muscle, Skeletal/*physiology
MH  - Posture
MH  - *Resistance Training
OTO - NOTNLM
OT  - kinematics
OT  - kinetics
OT  - power
OT  - velocity
OT  - weight releasers
EDAT- 2020/11/14 06:00
MHDA- 2021/05/22 06:00
CRDT- 2020/11/13 20:17
PHST- 2019/10/02 00:00 [received]
PHST- 2020/01/31 00:00 [revised]
PHST- 2020/03/01 00:00 [accepted]
PHST- 2020/11/14 06:00 [pubmed]
PHST- 2021/05/22 06:00 [medline]
PHST- 2020/11/13 20:17 [entrez]
AID - ijspp.2019-0769 [pii]
AID - 10.1123/ijspp.2019-0769 [doi]
PST - ppublish
SO  - Int J Sports Physiol Perform. 2021 Jan 1;16(1):66-72. doi: 
      10.1123/ijspp.2019-0769. Epub 2020 Nov 12.