TY - JOUR
T1 - Neural and muscular adjustments following repeated running sprints
AU - Perrey, Stéphane
AU - Racinais, Sébastien
AU - Saimouaa, Khaled
AU - Girard, Olivier
PY - 2010/8/1
Y1 - 2010/8/1
N2 - This study aimed to reveal the neural and muscular adjustments following a repeated-sprint (RS) running exercise. Sixteen subjects performed a series of neuromuscular tests before, immediately after and 30 min (passive recovery) post-RS exercise (12 × 40 m sprints interspaced by 30 s of passive recovery). Sprint times significantly lengthened over repetitions (+17% from the first to the last sprint; P<0.05). After RS running exercise, maximal voluntary contraction torque of the plantar flexors (-11 ± 7.3%), muscle activation (twitch interpolation) (-2.7 ± 3.4%) and soleus maximal M-wave amplitude (-20 ± 17%) were significantly (P<0.05) reduced but returned close to baseline after 30 min. Both soleus EMG activity and maximal Hoffmann reflex normalized with respect to M-wave amplitude did not change during the whole experiment. From pre- to post-RS exercise, evoked twitch response was characterized by lower peak torque and maximal rate of torque development (-13 and -11%, respectively, P<0.05), but was not different from baseline after recovery. Peak tetanus at 20 and 80 Hz were 17 and 8% lower (P<0.05) in the fatigued state, respectively. Acute muscle fatigue induced by RS running exercise is mainly peripheral as the short-term (30 min) recovery pattern of plantar flexors contractile properties follows that of the voluntary force-generating capacity.
AB - This study aimed to reveal the neural and muscular adjustments following a repeated-sprint (RS) running exercise. Sixteen subjects performed a series of neuromuscular tests before, immediately after and 30 min (passive recovery) post-RS exercise (12 × 40 m sprints interspaced by 30 s of passive recovery). Sprint times significantly lengthened over repetitions (+17% from the first to the last sprint; P<0.05). After RS running exercise, maximal voluntary contraction torque of the plantar flexors (-11 ± 7.3%), muscle activation (twitch interpolation) (-2.7 ± 3.4%) and soleus maximal M-wave amplitude (-20 ± 17%) were significantly (P<0.05) reduced but returned close to baseline after 30 min. Both soleus EMG activity and maximal Hoffmann reflex normalized with respect to M-wave amplitude did not change during the whole experiment. From pre- to post-RS exercise, evoked twitch response was characterized by lower peak torque and maximal rate of torque development (-13 and -11%, respectively, P<0.05), but was not different from baseline after recovery. Peak tetanus at 20 and 80 Hz were 17 and 8% lower (P<0.05) in the fatigued state, respectively. Acute muscle fatigue induced by RS running exercise is mainly peripheral as the short-term (30 min) recovery pattern of plantar flexors contractile properties follows that of the voluntary force-generating capacity.
KW - EMG
KW - Low- and high-frequency fatigue
KW - Multiple-sprint
KW - Recovery
UR - http://www.scopus.com/inward/record.url?scp=77956617874&partnerID=8YFLogxK
U2 - 10.1007/s00421-010-1445-3
DO - 10.1007/s00421-010-1445-3
M3 - Article
C2 - 20358218
AN - SCOPUS:77956617874
VL - 109
SP - 1027
EP - 1036
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
SN - 1439-6319
IS - 6
ER -