TY - JOUR
T1 - Plantar flexor neuromuscular adjustments following match-play football in hot and cool conditions
AU - Girard, O.
AU - Nybo, L.
AU - Mohr, M.
AU - Racinais, S.
PY - 2015/6/1
Y1 - 2015/6/1
N2 - We assessed neuromuscular fatigue and recovery of the plantar flexors after playing football with or without severe heat stress. Neuromuscular characteristics of the plantar flexors were assessed in 17 male players at baseline and ∼30min, 24, and 48h after two 90-min football matches in temperate (∼20°C and 55% rH) and hot (∼43°C and 20% rH) environments. Measurements included maximal voluntary strength, muscle activation, twitch contractile properties, and rate of torque development and soleus EMG (i.e., root mean square activity) rise from 0 to 30, -50, -100, and -200 ms during maximal isometric contractions for plantar flexors. Voluntary activation and peak twitch torque were equally reduced (-1.5% and -16.5%, respectively; P<0.05) post-matches relative to baseline in both conditions, the latter persisting for at least 48h, whereas strength losses (∼5%) were not significant. Absolute explosive force production declined (P<0.05) 30ms after contraction onset independently of condition, with no change at any other epochs. Globally, normalized rate of force development and soleus EMG activity rise values remained unchanged. In football, match-induced alterations in maximal and rapid torque production capacities of the plantar flexors are moderate and do not differ after competing in temperate and hot environments.
AB - We assessed neuromuscular fatigue and recovery of the plantar flexors after playing football with or without severe heat stress. Neuromuscular characteristics of the plantar flexors were assessed in 17 male players at baseline and ∼30min, 24, and 48h after two 90-min football matches in temperate (∼20°C and 55% rH) and hot (∼43°C and 20% rH) environments. Measurements included maximal voluntary strength, muscle activation, twitch contractile properties, and rate of torque development and soleus EMG (i.e., root mean square activity) rise from 0 to 30, -50, -100, and -200 ms during maximal isometric contractions for plantar flexors. Voluntary activation and peak twitch torque were equally reduced (-1.5% and -16.5%, respectively; P<0.05) post-matches relative to baseline in both conditions, the latter persisting for at least 48h, whereas strength losses (∼5%) were not significant. Absolute explosive force production declined (P<0.05) 30ms after contraction onset independently of condition, with no change at any other epochs. Globally, normalized rate of force development and soleus EMG activity rise values remained unchanged. In football, match-induced alterations in maximal and rapid torque production capacities of the plantar flexors are moderate and do not differ after competing in temperate and hot environments.
KW - Explosive force
KW - Fatigue
KW - Football
KW - Recovery
KW - Thermoregulation
UR - http://www.scopus.com/inward/record.url?scp=84928798329&partnerID=8YFLogxK
U2 - 10.1111/sms.12371
DO - 10.1111/sms.12371
M3 - Article
C2 - 25943666
AN - SCOPUS:84928798329
VL - 25
SP - 154
EP - 163
JO - Scandinavian Journal of Medicine & Science in Sports
JF - Scandinavian Journal of Medicine & Science in Sports
SN - 0905-7188
IS - S1
ER -