Force–Time Curve Characteristics of Dynamic and Isometric Muscle Actions of Elite Women Olympic Weightlifters

Objective: to investigate the effect of proprioceptive neuromuscular facilitation stretching on force-time curve and EMG Parameters in competitive aerobics athletes. Methods: we take 36 competitive aerobics athletes as participants, and they were tested after bicycle exercise and bicycle exercise/PNF stretching protocol,then the data were compared and analyzed.Conclusion: PNF stretching for lower extremity will not cause the maximum muscular strength and force - time curve parameters (MVC,F100,IRF,and TMVC) significantly decreased in competitive aerobics athletes, however,EMG voltage of rectus femoris has undergone a significant decline,which is showed that PNF stretch will cause change in excited mode,but force - time curve parameters will not be affected significantly.EMG showed that neural inhibition did not affect the maximum isometric muscle strength and characteristics of time - the power curve parameters, indicating PNF stretching can improve capability of muscle coordination.To take full advantage of PNF stretching exercises, changes of muscular strength and force - time curve parameters caused by PNF stretching should be studied in a more comprehensive, in-depth detail.

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Using the Force-Time Curve to Detect Maximal Grip Strength Effort

Journal of Hand Therapy ◽

10.1197/j.jht.2006.10.006 ◽

2007 ◽

Vol 20 (1) ◽

pp. 37-48 ◽

Cited By ~ 18

Author(s):

Orit Shechtman ◽

Bhagwant S. Sindhu ◽

Paul W. Davenport

Keyword(s):

Grip Strength ◽

Time Curve ◽

Force Time

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The Relationship Between Isometric Force-Time Curve Characteristics and Club Head Speed in Recreational Golfers

The Journal of Strength and Conditioning Research ◽

10.1519/jsc.0b013e31826791bf ◽

2012 ◽

Vol 26 (10) ◽

pp. 2685-2697 ◽

Cited By ~ 26

Author(s):

Brian K. Leary ◽

Jason Statler ◽

Britton Hopkins ◽

Rachael Fitzwater ◽

Tucker Kesling ◽

...

Keyword(s):

Isometric Force ◽

Time Curve ◽

Club Head ◽

Force Time ◽

The Relationship ◽

Recreational Golfers

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Control of Rapidly Executed Forces to a Target

Perceptual and Motor Skills ◽

10.2466/pms.1987.65.3.827 ◽

1987 ◽

Vol 65 (3) ◽

pp. 827-836

Author(s):

Donald Siegel

Keyword(s):

Visual Feedback ◽

Predictor Variable ◽

Peak Force ◽

Important Predictor ◽

Force Amplitude ◽

Time Curve ◽

Time To Peak ◽

Hand Grip ◽

Rapid Responses ◽

Force Time

The purpose of the present study was to determine whether initial measures of impulse (i.e., area under the force-time curve) could be used to predict peak force (PF) in hand grip responses of 5- and 10-kg amplitude executed as rapidly as possible. 12 subjects performed 75 practice and 25 test contractions in each condition, with and without visual feedback. The time to peak (PT) for the 5-kg responses was 41 msec., while the 10-kg condition averaged 56 msec. Analyses demonstrated no effect for visual feedback. Correlational analyses of cumulative impulse sections from 5 msec., to PF within conditions showed that early measures of force within a response were not very good predictors of final force amplitude. Indeed, for both conditions upwards of 85% of a reponse needed to have occurred before 50% of PF variance could be predicted. Analyses across conditions demonstrated that 50% of PF variance could be predicted between 15 and 20 msec. PT was also an important predictor variable. By using PT along with cumulative impulse 50% of the variance in PF could be predicted prior to 10 msec., at 5 kg (25% of PT) and at about 15 msec., for 10 kg (27% of PT). Across conditions, 85% of the variance in PF was predictable by 5 msec. Such results suggest that either more refined response indices are needed in predicting response outcome or that even for very rapid responses some lower level “tuning” probably occurs after initiation.

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