The purpose of this study was to compare the effects of a bout of high-volume isokinetic resistance exercise (HVP) on lower-body strength and markers of inflammation and muscle damage during recovery between young and middle-aged men. Nineteen recreationally-trained men were classified as either a young adult (YA: 21.8 +/- 2.0 y; 90.7 +/- 11.6 kg) or middle-aged adult (MA: 47.0 +/- 4.4 y; 96.0 +/- 21.5 kg) group. The HVP consisted of 8 sets of 10 repetitions, with one minute of rest between each set, performed on an isokinetic dynamometer at 60[degrees][middle dot]sec-1. Maximal voluntary isometric contractions (MVIC) and isokinetic peak (PKT) and average (AVGT) torque (measured at 240[degrees] and 60[degrees][middle dot]sec-1) were assessed at baseline (BL), immediately-post (IP), 120-min (120P), 24-hr (24H) and 48-hr (48H) following HVP. Blood was obtained at BL, IP, 30-min, 60-min, 120-min, 24H and 48H following HVP to assess muscle damage and inflammation. All performance data were analyzed using repeated-measures ANCOVA, while all inflammatory and muscle damage markers were analyzed using a two-way (time x group) repeated-measures ANOVA. Results revealed no between-group differences for PKT, AVGT, or rate of torque development at 200ms (RTD200). No between-group differences in myoglobin, creatine kinase, C-reactive protein, or interleukin-6 were observed. Although baseline differences in muscle performance were observed between YA and MA, no between group differences were noted in performance recovery measures from high-volume isokinetic exercise in recreationally-trained men. These results also indicate that the inflammatory and muscle damage response from high-volume isokinetic exercise is similar between recreationally-trained, young and middle-aged adult men.
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