I work for a sports specialist school in Melbourne, Australia, and we are trying to identify valid and reliable ways to assess neuromuscular fatigue. I have seen that, in clinical populations, grip strength is used to assess motor function, however I'm unsure as to the usefulness of this method in assessing neuromuscular fatigue in healthy athletic populations.
This article is a good overview of muscle fatigue, and it should be a good starting point for reference.
From what you were discussing, I would consider comparing maximum voluntary contractions using the hand dynamometer as an assessment of muscle fatigue after an adequately fatiguing bout of exercise. Hope this helps!
Article Measurement of human fatigue
Corben JS, Cerrone SA, Soviero JE, Kwiecien SY, Nicholas SJ, McHugh MP. Performance Demands in Softball Pitching: A Comprehensive Muscle Fatigue Study. Am J Sports Med. 2015 Jun 24. pii: 0363546515588179. [Epub ahead of print]
Severijns D, Lamers I, Kerkhofs L, Feys P. Hand grip fatigability in persons with multiple sclerosis according to hand dominance and disease progression. J Rehabil Med. 2015;47(2):154-60. doi: 10.2340/16501977-1897.
http://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDEQFjAB&url=http%3A%2F%2Fwww.medicaljournals.se%2Fjrm%2Fcontent%2Fdownload_preview.php%3Fdoi%3D10.2340%2F16501977-1897&ei=7r6jVbLmNqKPygP0n5WIAw&usg=AFQjCNErzkVMPA_pNNmzlRwj335amobuSw&bvm=bv.97653015,d.bGQ&cad=rja
https://www.researchgate.net/publication/266324475_Hand_Grip_Fatigability_in_Persons_with_Multiple_Sclerosis_According_to_Hand_Dominance_and_Disease_Progression
Anumula SK, Beku C, Murthy YSN. Measurement of reliability in grip strength. International Journal of Healthcare Sciences. 2014;1(1):1-6.
http://www.researchpublish.com/download.php?file=Measurement%20of%20Reliability%20in%20Grip%20Strength-69.pdf&act=book
Neu D, Mairesse O, Montana X, Gilson M, Corazza F, Lefevre N, Linkowski P, Le Bon O, Verbanck P. Dimensions of pure chronic fatigue: psychophysical, cognitive and biological correlates in the chronic fatigue syndrome. Eur J Appl Physiol. 2014;114(9):1841-51. doi: 10.1007/s00421-014-2910-1.
White C, Dixon K, Samuel D, Stokes M. Handgrip and quadriceps muscle endurance testing in young adults. Springerplus. 2013;2:451. doi: 10.1186/2193-1801-2-451.
http://www.springerplus.com/content/pdf/2193-1801-2-451.pdf
Roberts HC, Denison HJ, Martin HJ, Patel HP, Syddall H, Cooper C, Sayer AA. A review of the measurement of grip strength in clinical and epidemiological studies: towards a standardised approach. Age Ageing. 2011;40(4):423-9. doi: 10.1093/ageing/afr051.
http://ageing.oxfordjournals.org/content/40/4/423.full.pdf+html
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