TY - JOUR
T1 - Associated decrements in rate of force development and neural drive after maximal eccentric exercise
AU - Farup, J.
AU - Rahbek, S. K.
AU - Bjerre, J.
AU - de Paoli, F.
AU - Vissing, K.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - The present study investigated the changes in contractile rate of force development (RFD) and the neural drive following a single bout of eccentric exercise. Twenty-four subjects performed 15×10 maximal isokinetic eccentric knee extensor contractions. Prior to and at 24, 48, 72, 96, and 168h during post-exercise recovery, isometric RFD (30, 50 100, and 200ms), normalized RFD [1/6,1/2, and 2/3 of maximal voluntary contraction (MVC)] and rate of electromyography rise (RER; 30, 50, and 75ms) were measured. RFD decreased by 28-42% peaking at 48h (P<0.01-P<0.001) and remained depressed at 168h (P<0.05). Normalized RFD at 2/3 of MVC decreased by 22-39% (P<0.01), peaked at 72h and returned to baseline at 168h. These changes in RFD were associated with a decrease in RER at 48h-96h (P<0.05-P<0.001). Accumulated changes (area under curve) revealed a greater relative decrease in accumulated RFD at 100ms by -2727±309 (%h; P<0.05) and 200ms by -3035±271 (%h; P<0.001) compared with MVC, which decreased, by -1956±234 (%h). In conclusion, RFD and RER are both markedly reduced following a bout of maximal eccentric exercise. This association suggests that exercise-induced decrements in RFD can, in part, be explained decrements in neural drive.
AB - The present study investigated the changes in contractile rate of force development (RFD) and the neural drive following a single bout of eccentric exercise. Twenty-four subjects performed 15×10 maximal isokinetic eccentric knee extensor contractions. Prior to and at 24, 48, 72, 96, and 168h during post-exercise recovery, isometric RFD (30, 50 100, and 200ms), normalized RFD [1/6,1/2, and 2/3 of maximal voluntary contraction (MVC)] and rate of electromyography rise (RER; 30, 50, and 75ms) were measured. RFD decreased by 28-42% peaking at 48h (P<0.01-P<0.001) and remained depressed at 168h (P<0.05). Normalized RFD at 2/3 of MVC decreased by 22-39% (P<0.01), peaked at 72h and returned to baseline at 168h. These changes in RFD were associated with a decrease in RER at 48h-96h (P<0.05-P<0.001). Accumulated changes (area under curve) revealed a greater relative decrease in accumulated RFD at 100ms by -2727±309 (%h; P<0.05) and 200ms by -3035±271 (%h; P<0.001) compared with MVC, which decreased, by -1956±234 (%h). In conclusion, RFD and RER are both markedly reduced following a bout of maximal eccentric exercise. This association suggests that exercise-induced decrements in RFD can, in part, be explained decrements in neural drive.
KW - Eccentric exercise
KW - Maximal voluntary contraction force
KW - Rate of electromyography rise
UR - http://www.scopus.com/inward/record.url?scp=84928975617&partnerID=8YFLogxK
U2 - 10.1111/sms.12481
DO - 10.1111/sms.12481
M3 - Journal article
C2 - 25944178
AN - SCOPUS:84928975617
SN - 0905-7188
VL - 26
SP - 498
EP - 506
JO - Scandinavian Journal of Medicine and Science in Sports
JF - Scandinavian Journal of Medicine and Science in Sports
IS - 5
ER -