risultiati scientifici con le POWERCRANKS

[domitillo]

mi sono letto tutte le pagine dei 2 topic inerenti le PC ma una mia domanda non ha trovato risposta: qlc di voi può dirmi se ha avuto risultati scientificamente misurabili usando le PC? ad es. con due test conconi ecc.? per la cronaca io le sto aspettando...

Prodotti bici scontati

 

[laserpe.z]

mi sono letto tutte le pagine dei 2 topic inerenti le PC ma una mia domanda non ha trovato risposta: qlc di voi può dirmi se ha avuto risultati scientificamente misurabili usando le PC? ad es. con due test conconi ecc.? per la cronaca io le sto aspettando...

AFAIK, c'è solo questa:

Powercranks use a specially designed clutch to promote independent pedal work by each leg during cycling. We examined the effects of 6 wk of training on cyclists using Powercranks (n=6) or normal cranks (n=6) on maximal oxygen consumption (VO2max) and anaerobic threshold (AT) during a graded exercise test (GXT), and heart rate (HR), oxygen consumption (VO2), respiratory exchange ration (RER), and gross efficiency (GE) during a 1-hour submaximal ride at a constant load. Subjects trained at 70% of VO2max for 1 h.d(-1), 3 d.wk(-1), for 6 weeks. The GXT and 1-hour submaximal ride were performed using normal cranks pretraining and posttraining. The 1-hour submaximal ride was performed at an intensity equal to approximately 69% of pretraining VO2max with VO2, RER, GE, and HR determined at 15-minute intervals during the ride. No differences were observed between or within groups for VO2max or AT during the GXT. The Powercranks group had significantly higher GE values than the normal cranks group (23.6 +/- 1.3% versus 21.3 +/- 1.7%, and 23.9 +/- 1.4% versus 21.0 +/- 1.9% at 45 and 60 min, respectively), and significantly lower HR at 30, 45, and 60 minutes and VO2 at 45 and 60 minutes during the 1-hour submaximal ride posttraining. It appears that 6 weeks of training with Powercranks induced physiological adaptations that reduced energy expenditure during a 1-hour submaximal ride.

 

[New]

cronometrici ne ho a bizzeffe... proprio ieri sera ho notato ulteriori miglioramenti inaspettati.

 

[all_i_need_is_bike]

Non è un dato propriamente "scientifico"... ma domenica -pur in giornata decisamente no con gambe stanche che non volevano saperne di girare- nella seconda metà della penultima e nell'ultima salita del megagiro da 218 km e 5900 m di dislivello mi ha salvato la pedalata "running" acquisita con le PowerCranks; d'un tratto mi è venuto in mente di provare a "tirare su" nel modo corretto, e mi son reso conto di migliorare il rendimento (leggi velocità) con una sostanziale costanza nella sensazione di sforzo percepito.

 

[domitillo]

AFAIK, c'è solo questa:

Powercranks use a specially designed clutch to promote independent pedal work by each leg during cycling. We examined the effects of 6 wk of training on cyclists using Powercranks (n=6) or normal cranks (n=6) on maximal oxygen consumption (VO2max) and anaerobic threshold (AT) during a graded exercise test (GXT), and heart rate (HR), oxygen consumption (VO2), respiratory exchange ration (RER), and gross efficiency (GE) during a 1-hour submaximal ride at a constant load. Subjects trained at 70% of VO2max for 1 h.d(-1), 3 d.wk(-1), for 6 weeks. The GXT and 1-hour submaximal ride were performed using normal cranks pretraining and posttraining. The 1-hour submaximal ride was performed at an intensity equal to approximately 69% of pretraining VO2max with VO2, RER, GE, and HR determined at 15-minute intervals during the ride. No differences were observed between or within groups for VO2max or AT during the GXT. The Powercranks group had significantly higher GE values than the normal cranks group (23.6 +/- 1.3% versus 21.3 +/- 1.7%, and 23.9 +/- 1.4% versus 21.0 +/- 1.9% at 45 and 60 min, respectively), and significantly lower HR at 30, 45, and 60 minutes and VO2 at 45 and 60 minutes during the 1-hour submaximal ride posttraining. It appears that 6 weeks of training with Powercranks induced physiological adaptations that reduced energy expenditure during a 1-hour submaximal ride.

questo lo ho già letto... in particolare mi piacerebbe sapere se qlc di voi ha mai fatto un test conconi prima e dopo l'uso delle PC...

 

[lapo]

cronometrici ne ho a bizzeffe... proprio ieri sera ho notato ulteriori miglioramenti inaspettati.

I miglioramenti li noti quando monti le pedivelle tradizionali o anche con PC? Ad esempio: su una salita impieghi meno con PC o con le tradizionali? Io per adesso sono riuscito a provarle poco () ma dopo una sola settimana di PC usando le pedivelle normali avevo la sensazione di pedalare col fisso...

 

[New]

i miglioramenti li noto per il momento con le pedivelle normali. anche se da un mese a questa parte fare qualche minuto sui rulli con le PC prima della prestazione mi hanno fatto notare che rendo molto di più. sembra quindi importante prima dello sforzo "richiamare" alla mente il movimento giusto.

 

[laserpe.z]

eccone un'altro:

SmartCranks use a free running bearing to promote independent pedal work by each leg during cycling. This system is designed for training the upstroke phase during cycling. The effects of training with SmartCranks on the power output (PO) and on cycle work distribution at the anaerobic threshold and the maximum power level were examined. Twenty male, non-professional cyclists were randomly assigned into intervention and control group, training 5 weeks with SmartCranks and conventional cranks, respectively. Before and after the training period the subjects performed an incremental test to exhaustion. Lactate was measured to determine the individual anaerobic threshold (IAT) and forces at the pedal were recorded to quantify changes in the work distribution over the full revolution. We observed no significant statistical difference for peak power (PO; 333.3 +/- 32.8 W vs. 323.3 +/- 21.8 W) and PO at IAT (229.6 +/- 30.1 W vs. 222.7 +/- 25.2 W) for SmartCrank and control conditions, respectively (P > 0.05). However, we did observe that work distribution in the downward phase was significantly reduced in the SmartCranks training group at peak PO (from 70.0 +/- 4.9% to 64.3 +/- 5.8%; P < 0.05). Although the possible implications of the change in the work distribution of sectors are not known, for the success in cycling performance-indicated by the PO-training with the SmartCranks was not more advantageous than training with conventional bicycle cranks.