TY - JOUR
T1 - The relationship between plasma potassium concentration and muscle torque during recovery following intense exercise
AU - McEniery, Carmel M.
AU - Jenkins, David G.
AU - Barnett, Christopher
PY - 1997
Y1 - 1997
N2 - The present study investigated the relationship between plasma potassium ion concentration ([K+]) and skeletal muscle torque during three different 15-min recovery periods after fatigue induced by four 30-s sprints. Four males and one female completed the multiple sprint exercise on three separate days; recovery was passive, i.e. no cycling exercise (PRec), active cycling at 30% peak oxygen consumption V̇O(2peak) (30% Rec) and active cycling at 60% V̇O(2peak) (60% Rec). Plasma [K+] was measured from blood sampled from an antecubital vein of subjects at rest and at 0, 3, 5, 10 and 15 min into each recovery. Isokinetic leg strength was measured at rest and at 1, 6, 11 and 16 min during each recovery. Following the exhaustive sprints, [K+] increased significantly from an average mean (SEM) resting value of 3.81 (0.07) mmol·l-1 to 4.48 (0.19) mmol·l-1 (P < 0.01). In all recovery conditions, plasma [K+] returned to resting levels within 3 min following the fourth sprint. However, in the two active recovery conditions plasma [K+] increased over the remainder of the recovery periods to 4.36 (0.12) mmol·l-1 in the 30% Rec condition and 4.62 (0.12) mmol·l-1 in the 60% Rec condition, the latter being significantly higher than the former (P < 0.01). The maximum torque measured following the sprints decreased significantly, on average, to 61.1 (8.36)% of peak levels (P < 0.01). After 15 min of recovery, maximum torque was highest in the 30% Rec condition at 92.13 (3.06)% of peak levels (P < 0.01), compared to 85.23 (3.64)% and 85.71 (0.82)% for the PRec and 60% Rec conditions, respectively. In contrast to the significant differences in plasma [K+] across all three recovery conditions, muscle torque recovery was significantly different in only the 30% Rec condition. In summary, recovery of peak levels of muscle torque following fatiguing exercise does not appear to follow changes in plasma [K+].
AB - The present study investigated the relationship between plasma potassium ion concentration ([K+]) and skeletal muscle torque during three different 15-min recovery periods after fatigue induced by four 30-s sprints. Four males and one female completed the multiple sprint exercise on three separate days; recovery was passive, i.e. no cycling exercise (PRec), active cycling at 30% peak oxygen consumption V̇O(2peak) (30% Rec) and active cycling at 60% V̇O(2peak) (60% Rec). Plasma [K+] was measured from blood sampled from an antecubital vein of subjects at rest and at 0, 3, 5, 10 and 15 min into each recovery. Isokinetic leg strength was measured at rest and at 1, 6, 11 and 16 min during each recovery. Following the exhaustive sprints, [K+] increased significantly from an average mean (SEM) resting value of 3.81 (0.07) mmol·l-1 to 4.48 (0.19) mmol·l-1 (P < 0.01). In all recovery conditions, plasma [K+] returned to resting levels within 3 min following the fourth sprint. However, in the two active recovery conditions plasma [K+] increased over the remainder of the recovery periods to 4.36 (0.12) mmol·l-1 in the 30% Rec condition and 4.62 (0.12) mmol·l-1 in the 60% Rec condition, the latter being significantly higher than the former (P < 0.01). The maximum torque measured following the sprints decreased significantly, on average, to 61.1 (8.36)% of peak levels (P < 0.01). After 15 min of recovery, maximum torque was highest in the 30% Rec condition at 92.13 (3.06)% of peak levels (P < 0.01), compared to 85.23 (3.64)% and 85.71 (0.82)% for the PRec and 60% Rec conditions, respectively. In contrast to the significant differences in plasma [K+] across all three recovery conditions, muscle torque recovery was significantly different in only the 30% Rec condition. In summary, recovery of peak levels of muscle torque following fatiguing exercise does not appear to follow changes in plasma [K+].
KW - Active recovery
KW - Exercise intensity
KW - Plasma [K]
UR - http://www.scopus.com/inward/record.url?scp=0030923032&partnerID=8YFLogxK
U2 - 10.1007/s004210050189
DO - 10.1007/s004210050189
M3 - Article
C2 - 9189736
AN - SCOPUS:0030923032
SN - 0301-5548
VL - 75
SP - 462
EP - 466
JO - European Journal of Applied Physiology and Occupational Physiology
JF - European Journal of Applied Physiology and Occupational Physiology
IS - 5
ER -