A single bout of downhill running transiently increases HOMA-IR without altering adipokine response in healthy adult women.
OBJECTIVE
Eccentric exercise-induced muscle damage may cause marked alterations in insulin sensitivity. However, it is not entirely known whether such alterations are also related to changes in adipokine levels. The aim of this study was to investigate the effects of muscle damage due to downhill running on inflammation, insulin sensitivity and selected adipokines related to insulin regulation (adiponectin, visfatin, resistin).


METHODS
Data were collected from 12 healthy adult women. Each subject participated in two trials, 4 weeks apart. The first trial was reserved for resting measurements only (control trial), while the second trial involved a 45-min exercise (-15 % slope, ~60 % of VO2max) intervention (exercise trial). Insulin sensitivity (HOMA), creatine kinase activity (CK), delayed onset muscle soreness (DOMS), tumor necrosis factor α (TNF-α), interleukin 6 (IL-6), glucose, insulin, adiponectin, resistin, and visfatin were assessed pre-exercise and 1, 2, 3, and 4 days post-exercise and during the same time points in the control trial.


RESULTS
Analyses revealed that CK, DOMS, TNF-α, IL-6, insulin and HOMA significantly increased (p < 0.05) throughout recovery (days 1-4). Adiponectin and visfatin remained unchanged, while resistin significantly increased (p < 0.05) only 2 days post-exercise. Visfatin was negatively correlated with HOMA at days 1 and 4 of recovery.


CONCLUSIONS
Although muscle damage due to downhill running caused a decline of insulin sensitivity, this response was not associated with the changes in adipokine levels.
Department of Physical Education and Sport Science, University of Thessaly, Karies, 42100, Trikala, Greece, ajamurt@pe.uth.gr.
A Z
AZ
Jamurtas
A
A
Garyfallopoulou
A A
AA
Theodorou
A
A
Zalavras
V
V
Paschalis
C K
CK
Deli
M G
MG
Nikolaidis
I G
IG
Fatouros
Y
Y
Koutedakis
D054392:Adipokines / Q000097:blood*; D000328:Adult; D003402:Creatine Kinase / Q000097:blood; D005260:Female; D006801:Humans; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D063806:Myalgia / Q000097:blood; D010101:Oxygen Consumption; D012420:Running; D014409:Tumor Necrosis Factor-alpha / Q000097:blood
D054392:Adipokines; D007328:Insulin; D014409:Tumor Necrosis Factor-alpha; D003402:Creatine Kinase