Effects of consecutive days of exercise and recovery on muscle mechanical function

Medicine and Science in Sports and Exercise
Riley D StewartH Green

Abstract

To investigate the effects of three consecutive days of prolonged exercise on muscle mechanical function, 12 volunteers (.VO(2peak) = 44.8 +/- 2.0 mL.kg(-1).min(-1), mean +/- SE) cycled at approximately 60% .VO(2peak) until fatigue. Quadriceps muscle function was assessed before and after exercise on day 1 (E1) and day 3 (E3) and during three consecutive days of recovery (R1, R2, R3), using both voluntary and electrically induced contractions at various stimulation frequencies. Exercise on E1 and E3 resulted in a 40% (120 +/- 12 vs 72 +/- 10 N) and 35% (117 +/- 14 vs 78 +/- 8 N) deficit (P < 0.05) in force at 10 Hz, respectively, which remained depressed (P < 0.05) by 32-34% during R1-R3. At 100 Hz, force, although not altered by exercise at E1 or E3, was decreased (P < 0.05) by 12-16% during recovery. The maximal rate of relaxation (-dF/dtmax) at 10 Hz was reduced (P < 0.05) by 38% on E1, by 32% on E3, and remained depressed by 38% through R3. At 100 Hz, -dF/dtmax was only depressed (P < 0.05) during recovery. Maximal rate of force development (+dF/dtmax) at 10 Hz was reduced (P < 0.05) by exercise, but not in recovery. Maximal voluntary contraction force was depressed (P < 0.05) with exercise at both E1 and E3 and remained de...Continue Reading

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Citations

Mar 30, 2013·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Juha OksaSirkka Rissanen
Nov 4, 2010·European Journal of Applied Physiology·H J GreenJ E Yau
May 11, 2011·European Journal of Applied Physiology·Martyn G MorrisHooshang Izadi
Sep 27, 2015·Archives of Biochemistry and Biophysics·Anna HalamaJerzy Adamski
Mar 30, 2010·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Albertas SkurvydasSaule Sipaviciene
Dec 3, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·James P GavinMark E T Willems
Dec 17, 2009·Medicine and Science in Sports and Exercise·Emma Z RossKeith George
Jan 31, 2008·American Journal of Physiology. Endocrinology and Metabolism·H J GreenJ Ouyang
Jul 25, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Howard J GreenJing Ouyang

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