The sample size calculation using Lin’s concordance correlation coefficient, given a 95% precision and 2% loss, indicated we needed 177 patients.

I've been wondering about my numbers ever since the Physical Therapist for a hand/wrist/forearm injury said "oh my gosh! I've never seen a number that high!" To which I smiled and said "now let me REALLY try" and topped out at 176 psi, or 80 kilos. - on my injured arm... on my right arm (I'm left handed), at age 32, height 6'3" weight 205 pounds. But is simply a matter of genetics = my younger brother at 5'10" and slightly smaller hands is almost as strong, and we both inherited it from our Dad, who as a farm boy would win quarters for a soda pop off of farmers by being able to crush a fresh farm egg in his palm (no rings, no fingertips, and no thin shelled store eggs). Thanks for letting me share, and yes our forearms looked a little like Popeyes, and I can flex my thumb muscles unlike most people have ever seen.... Scotty Dean (2017) Núñez-Cortés R, del Pozo Cruz B, Gallardo-Gómez D, Calatayud J, Cruz-Montecinos C, López-Gil JF, López-Bueno R. Handgrip strength measurement protocols for all-cause and cause-specific mortality outcomes in more than 3 million participants: A systematic review and meta-regression analysis. Clin Nutr. 2022;41(11):2473–89. Previously, two studies by Guerra and Amaral [ 31] and Kim and Shinkai [ 32] compared the Jamar and Smedley dynamometers at one time point in older adults ranging in age from 65 to 99 years. Guerra and Amaral [ 31] reported a correlation coefficient of r = 0.83 with a mean difference of 3.2 kg, which is similar to but slightly smaller than our current findings. In contrast to our findings, they reported that the level of agreement between the two devices was poorer for women compared to men, and old-old compared to young-old. In our sample, women demonstrated better agreement than men, and old-old participants demonstrated better agreement than the young-old. Participant differences may somehow have influenced discrepancies in our findings. Our sample was somewhat younger, with an average age of 76.2 years, compared to 79.2 years for their sample. Furthermore, our sample was evenly distributed between men and women, while theirs was predominantly (76%) female.After the measurement has been taken read the value displayed on the dynamometer and record it then turn the pulley to set the indicator to zero and repeat the measurement once again. Reliability and validity have been proven through several studies.[ 13 , 14 , 15 , 16 , 17 , 18] It is known that the HGS tends to be measured higher in recent models compared to the earlier model, which might be due to the friction of the handles.[ 16 , 19] Also, the earlier models are known to show a greater error rate.[ 19] Therefore, it may not be appropriate to compare old normative data with recent data.[ 13 , 19] The plastic construction does feel a bit delicate to some. This dynamometer is also capable of showing a comparison between the current and the last reading. The Constant Dynamometer Grip Strength is ideal for people undergoing physiotherapy.

Bellace, J. V., Healy, D., et al. (2000). "Validity of the Dexter Evaluation System's Jamar dynamometer attachment for assessment of hand grip strength in a normal population." J Hand Ther 13(1): 46-51. Find it on PubMed Most studies in this field have reported numerous types of hand dynamometers to measure grip strength in addition to Jamar, such as the DynEX, Grip-ball, Smedley, and other measurement devices. Kim et al. [ 8] reported evidence between the Jamar and Smedley dynamometers in 2017; 478 participants attended the study. There was systematic bias with underestimating HGS by the Smedley dynamometer compared with Jamar, bias 3.09 kg for men and bias 2.6 kg for women. Shechtman et al. [ 7] reported the reliability and validity of the digital DynEx Dynamometer in 2005. This study selected the Jamar criterion as the gold standard, and 100 young, healthy subjects aged 20–40 years were included; the data revealed high test–retest reliability for the DynEx Dynamometer ( r = 0.9864) [ 7]. According to the present results, the sample size for the DynEx dynamometer is so small that more evidence is needed to support this conclusion. A grip-ball dynamometer can be used for home self-monitoring HGS because of a pressure sensor. Vermeulen et al. [ 26] reported that the Pearson correlations between grip ball and the Jamar dynamometer were 0.71 and 0.76 for the left and right hands, respectively. Indeed, the use of grip-ball dynamometers in our country is rare; on the other hand, the implementation of grip-ball as a screening and monitoring HGS device is uncertain. Vermeulen J, Neyens JC, Spreeuwenberg MD, van Rossum E, Hewson DJ, de Witte LP. Measuring grip strength in older adults: comparing the grip-ball with the Jamar dynamometer. J Geriatr Phys Ther. 2015;38(3):148–53.Meng X, Song M, Vilaj M, Štambuk J, Dolikun M, Zhang J, et al. Glycosylation of IgG associates with hypertension and Type 2 diabetes mellitus comorbidity in the Chinese muslim ethnic minorities and the Han Chinese. J Pers Med. 2021;11(7):614.

Handgrip strength acts as a biomarker for general health because of its relationship with so many other health-related variables, including bone-mineral density, nutrition status, cognitive impairment, sleep problems and quality of life,” says Richard Bohannon, a physical therapist who has researched grip strength. “It’s been referred to as a vitality meter.” To wrap up, decide on a dynamometer that best meets your requirements for testing. There’s a variety of grip testers on the market, but we have focused on the dynamometerwe sellfor this post; we know they are accurate and reliable and the choice of many professional sports clubs, academic institutions and the national health service. However, there are other options. If you are interested, take a look at Jamar and Camry. Handgrip strength is a useful measurement of muscle strength and has been proposed as a single predictor of postoperative outcomes in older adults. The aim of this study was to assess the correlation and concordance of Camry digital hand grip dynamometer (EH101) with gold standard Jamar® hydraulic handgrip dynamometer in older adults previous to elective surgery. Methods Savino E, Martini E, Lauretani F, Pioli G, Zagatti AM, Frondini C, et al. Handgrip strength predicts persistent walking recovery after hip fracture surgery. The American journal of medicine. 2013;126(12):1068-75. My 14 yr old female patient had two strokes and we have been working to bring her right arm grip strength to 5 lbsThe test result is analysed by comparing it with the athlete's previous results for this test. It is expected that the analysis would indicate an improvement in the athlete's grip strength with appropriate training between each test. Target Group

To ensure a similar grip length for all patients, the Jamar® dynamometer was used in the second position, and the Camry dynamometer was used in the third position. Sousa-Santos A R & Amaral T F. (2017). Differences in handgrip strength protocols to identify sarcopenia and frailty-a systematic review. BMC Geriatr. 2017;17(1):1–21. The forearm muscles are easily fatigued, so the best scores are usually achieved in the first or second trial. This is pretty useful and don't believe these people trying to show off on this forum. All I see are blatant lies Watanabe T, Owashi K, Kanauchi Y, Mura N, Takahara M, Ogino T. The short-term reliability of grip strength measurement and the effects of posture and grip span. J Hand Surg Am. 2005;30(3):603–9.Lee SB, Oh JH, Park JH, Choi SP, Wee JH. Differences in youngest-old, middle-old, and oldest-old patients who visit the emergency department. Clin Experiment Emerg Med. 2018;5(4):249. Mathiowetz, V. (2002). "Comparison of Rolyan and Jamar dynamometers for measuring grip strength." Occup Ther Int 9(3): 201-209. Find it on PubMed So what should we be doing to improve grip? “I would recommend repeated squeezing of an object at 80% or higher of your maximal ability, releasing each contraction with control,” says Lin. Cole suggests holding a 10kg weight plate in each hand for a minute, or wringing out a wet towel, holding the “squeeze” position for around 30 seconds. “Don’t be surprised if you find differences between your right and left hands – the ‘dominant’ hand is typically 10% stronger,” he says. Generally, you will test a patient's strength by having them squeeze the dynamo meter, telling them to do so as hard as they can, you will then record the results and observe how the individual is progressing or regressing from their last testing point.