Guest guest Posted December 17, 2003 Report Share Posted December 17, 2003 Autonomic adaptations to intensive and overload training periods: a laboratory study. Pichot V, Busso T, Roche F, Garet M, Costes F, Duverney D, Lacour JR, Barthelemy JC. Laboratorie de Physiologie, GIP E2S, Universite de Saint-Etienne, France. .Pichot@... PURPOSE: Looking for practical and reliable markers of fatigue is of particular interest in elite sports. One possible marker might be the autonomic nervous system activity, known to be well affected by physical exercise and that can be easily assessed by heart rate variability. METHODS: We designed a laboratory study to follow six sedentary subjects (32.7 +/- 5.0 yr) going successively through 2 months of intensive physical training and 1 month of overload training on cycloergometer followed by 2 wk of recovery. Maximal power output over 5 min (Plim5'), VO(2) and standard indices of heart rate variability were monitored all along the protocol. RESULTS: During the intensive training period, physical performance increased significantly VO(2peak) : +20.2%, < 0.01; Plim5': +26.4%, < 0.0001) as well as most of the indices of heart rate variability (mean RR, Ptot, HF, rMSSD, pNN50, SDNNIDX, SDNN, all < 0.05) with a significant shift in the autonomic nervous system toward a predominance of its parasympathetic arm (LF/HF, LFnu, HFnu, < 0.01). During the overload training period, there was a stagnation of the parasympathetic indices associated to a progressive increase in sympathetic activity (LF/HF, < 0.05). During the week of recovery, there was a sudden significant rebound of the parasympathetic activity (mean RR, HF, pNN50, rMSSD, all < 0.05). After 7 wk of recovery, all heart rate variability indices tended to return to the prestudy values. CONCLUSION: Autonomic nervous system status depends on cumulated physical fatigue due to increased training loads. Therefore, heart rate variability analysis appears to be an appropriate tool to monitor the effects of physical training loads on performance and fitness, and could eventually be used to prevent overtraining states. The effects of detraining on power athletes. Hortobagyi T, Houmard JA, son JR, Fraser DD, s RA, Israel RG. Human Performance Laboratory, East Carolina University, Greenville, NC 27858. We investigated the effects of 14 d of resistive exercise detraining on 12 power athletes. In comparing performances pre- to post-detraining, there were no significant (P > 0.05) changes in free weight bench press (-1.7%), parallel squat (-0.9%), isometric (-7%) and isokinetic concentric knee extension force (-2.3%), and vertical jumping (1.2%). In contrast, isokinetic eccentric knee extension force decreased in every subject (-12%, P < 0.05). Post-detraining, the changes in surface EMG activity of the vastus lateralis during isometric, and isokinetic eccentric and concentric knee extension were -8.4%, -10.1%, and -12.7%, respectively (all P > 0.05). No significant changes occurred in knee flexion forces or EMGs (P > 0.05). Percentages of muscle fiber types and the Type I fiber area remained unchanged, but Type II fiber area decreased significantly by -6.4% (P < 0.05). Levels of plasma growth hormone (58.3%), testosterone (19.2%), and the testosterone to cortisol ratio (67.6%) increased, whereas plasma cortisol (-21.5%) and creatine kinase enzyme levels (-82.3%) decreased (all P < 0.05). Short-term resistive exercise detraining may thus specifically affect eccentric strength or the size of the Type II muscle fibers, leaving other aspects of neuromuscular performance uninfluenced. Changes in the hormonal milieu during detraining may be conducive to an enhanced anabolic process, but such changes may not materialize at the tissue level in the absence of the overload training stimulus. Baggett Arkansas USA _________________________________________________________________ Tired of slow downloads? Compare online deals from your local high-speed providers now. https://broadband.msn.com Quote Link to comment Share on other sites More sharing options...
Guest guest Posted December 23, 2003 Report Share Posted December 23, 2003 " CONCLUSION: Autonomic nervous system status depends on cumulated physical fatigue due to increased training loads. Therefore, heart rate variability analysis appears to be an appropriate tool to monitor the effects of physical training loads on performance and fitness, and could eventually be used to prevent overtraining states. " It " could eventually " be used to prevent overtraining states? This looks like a very well done study but these researchers might want to do a little more research to find that HRV is already being used by many people today to prevent overtraining and manage the organization of training by many professional sports organizations and universities around the world, and I use it everyday myself with my athletes. England's National Rugby Team recently won the World Cup Championship (a game it hadn't been to in 12 years) and Stanford's men's and women's cross country teams both won NCAA National Championships. All of these teams currently use HRV to monitor their athletes to prevent overtraining and manage training effects. HRV monitoring is an extremely powerful tool for monitoring the effects of training and will likely become more well known and utilized in the years to come as more people become aware of its abilities and potential - son CSCS EndZone Athletics Director Kirkland WA re: neural recovery Autonomic adaptations to intensive and overload training periods: a laboratory study. Pichot V, Busso T, Roche F, Garet M, Costes F, Duverney D, Lacour JR, Barthelemy JC. Laboratorie de Physiologie, GIP E2S, Universite de Saint-Etienne, France. .Pichot@... PURPOSE: Looking for practical and reliable markers of fatigue is of particular interest in elite sports. One possible marker might be the autonomic nervous system activity, known to be well affected by physical exercise and that can be easily assessed by heart rate variability. METHODS: We designed a laboratory study to follow six sedentary subjects (32.7 +/- 5.0 yr) going successively through 2 months of intensive physical training and 1 month of overload training on cycloergometer followed by 2 wk of recovery. Maximal power output over 5 min (Plim5'), VO(2) and standard indices of heart rate variability were monitored all along the protocol. RESULTS: During the intensive training period, physical performance increased significantly VO(2peak) : +20.2%, < 0.01; Plim5': +26.4%, < 0.0001) as well as most of the indices of heart rate variability (mean RR, Ptot, HF, rMSSD, pNN50, SDNNIDX, SDNN, all < 0.05) with a significant shift in the autonomic nervous system toward a predominance of its parasympathetic arm (LF/HF, LFnu, HFnu, < 0.01). During the overload training period, there was a stagnation of the parasympathetic indices associated to a progressive increase in sympathetic activity (LF/HF, < 0.05). During the week of recovery, there was a sudden significant rebound of the parasympathetic activity (mean RR, HF, pNN50, rMSSD, all < 0.05). After 7 wk of recovery, all heart rate variability indices tended to return to the prestudy values. CONCLUSION: Autonomic nervous system status depends on cumulated physical fatigue due to increased training loads. Therefore, heart rate variability analysis appears to be an appropriate tool to monitor the effects of physical training loads on performance and fitness, and could eventually be used to prevent overtraining states. The effects of detraining on power athletes. Hortobagyi T, Houmard JA, son JR, Fraser DD, s RA, Israel RG. Human Performance Laboratory, East Carolina University, Greenville, NC 27858. We investigated the effects of 14 d of resistive exercise detraining on 12 power athletes. In comparing performances pre- to post-detraining, there were no significant (P > 0.05) changes in free weight bench press (-1.7%), parallel squat (-0.9%), isometric (-7%) and isokinetic concentric knee extension force (-2.3%), and vertical jumping (1.2%). In contrast, isokinetic eccentric knee extension force decreased in every subject (-12%, P < 0.05). Post-detraining, the changes in surface EMG activity of the vastus lateralis during isometric, and isokinetic eccentric and concentric knee extension were -8.4%, -10.1%, and -12.7%, respectively (all P > 0.05). No significant changes occurred in knee flexion forces or EMGs (P > 0.05). Percentages of muscle fiber types and the Type I fiber area remained unchanged, but Type II fiber area decreased significantly by -6.4% (P < 0.05). Levels of plasma growth hormone (58.3%), testosterone (19.2%), and the testosterone to cortisol ratio (67.6%) increased, whereas plasma cortisol (-21.5%) and creatine kinase enzyme levels (-82.3%) decreased (all P < 0.05). Short-term resistive exercise detraining may thus specifically affect eccentric strength or the size of the Type II muscle fibers, leaving other aspects of neuromuscular performance uninfluenced. Changes in the hormonal milieu during detraining may be conducive to an enhanced anabolic process, but such changes may not materialize at the tissue level in the absence of the overload training stimulus. Baggett Arkansas USA Quote Link to comment Share on other sites More sharing options...
Guest guest Posted December 29, 2003 Report Share Posted December 29, 2003 son writes: <<------------- All of these teams currently use HRV to monitor their athletes to prevent overtraining and manage training effects. HRV monitoring is an extremely powerful tool for monitoring the effects of training and will likely become more well known and utilized in the years to come as more people become aware of its abilities and potential >> HRV, as you've illustrated, is profoundly important -- furthermore if every stress(neural and physical) prone individual wore one of these $30 gadgets physical (and mental!) stress would decrease astronimically. do you have any opinion as to the correlation between physical and neural stress -- admittedly using terms more synchronous than dichotomous. PB'S Jerry Telle Lakewood CO USA Quote Link to comment Share on other sites More sharing options...
Guest guest Posted December 29, 2003 Report Share Posted December 29, 2003 son writes: <<------------- All of these teams currently use HRV to monitor their athletes to prevent overtraining and manage training effects. HRV monitoring is an extremely powerful tool for monitoring the effects of training and will likely become more well known and utilized in the years to come as more people become aware of its abilities and potential >> HRV, as you've illustrated, is profoundly important -- furthermore if every stress(neural and physical) prone individual wore one of these $30 gadgets physical (and mental!) stress would decrease astronimically. do you have any opinion as to the correlation between physical and neural stress -- admittedly using terms more synchronous than dichotomous. PB'S Jerry Telle Lakewood CO USA Quote Link to comment Share on other sites More sharing options...
Guest guest Posted January 5, 2004 Report Share Posted January 5, 2004 HRV = Heart Rate Variability, and unfortunately good HRV analysis tools are several thousand dollars, were they only $30 I'd hope every single person who lifted weights or trained for anything would have one and the stress of trying to figure out individual training programs would be significantly less. As for the correlation between physical and neural stress, I've found it to be highly variable depending on the type of physical stress and an individual's genetics. Certainly higher intensity type physical stressors, i.e. max effort strength work, plyometric training, etc tend to have a much larger impact on CNS, but then again a lack of sleep, mental stress and other non-physically demaning factors can likewise cause significant neural stress. son Kirkland, WA >From: JRTELLE@... >Reply-To: Supertraining >To: >Supertraining >Subject: Re: Neural Recovery > >Date: Mon, 29 Dec 2003 18:29:40 EST > > son writes: > > ><<------------- All of these teams >currently use HRV to monitor their >athletes to prevent overtraining and >manage training effects. HRV >monitoring is an extremely powerful tool for >monitoring the effects of >training and will likely become more well known >and utilized in the years >to come as more people become aware of its >abilities and potential >> > > >HRV, as you've illustrated, is profoundly important -- furthermore if >every >stress(neural and physical) prone individual wore one of these $30 >gadgets >physical (and mental!) stress would decrease astronimically. > > > do you have any opinion as to the correlation between physical and > >neural stress -- admittedly using terms more synchronous than >dichotomous. > >PB'S > >Jerry Telle >Lakewood CO USA > > > _________________________________________________________________ Take advantage of our limited-time introductory offer for dial-up Internet access. http://join.msn.com/?page=dept/dialup Quote Link to comment Share on other sites More sharing options...
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