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Ha YC, Hwang SC, Song SY, Lee C, Park KS, Yoo JI. Hand grip strength measurement in different epidemiologic studies using various methods for diagnosis of sarcopenia: a systematic review. Eur Geriatr Med. 2018;9(3):277–88. LinY H, Chen HC, Hsu NW, Chou P. Using hand grip strength to detect slow walking speed in older adults: the Yilan study. BMC Geriatr. 2021;21(1):1–10. Before each measurement turn the centre dial gently in the direction of the arrow until the indicator is set to zero “0”. The digital version just needs the ON/C button to be pressed. Don’t do this if you want the mean value readings, just move from hand to hand.
Duan YJ. Advance in hand grip measurement(review). Chin J Rehab Theory Pract. 2009;15(10):948–951. (In Chinese). SEM = SD × \(\sqrt{1-\mathrm{ICC}}\); MDC = 1.96 × \(\sqrt{2}\)×SEM; SEM% = (SEM/mean) × 100% [ 10]; MDC% = (MDC/mean) × 100% [ 11] (SD: standard deviation of the difference; mean: average grip strength values of two dynamometers). Moreover, Spearman correlation and simple linear regression were also performed to assess correlations between the two devices. We considered Spearman correlation coefficients larger than 0.80 to be excellent. Several reports have revealed that there was a significant correlation between HGS and BMD of the bones adjacent to the muscles related to grip.[ 67 , 68 , 69] Osei-Hyiaman et al. [ 67] studied 1,168 menopausal women and found that there was a significant correlation between HGS and BMD of the metacarpal index (r=0.2474, P<0.001). Di Monaco et al. [ 68] reported that HGS correlated with BMD of the distal radius when they analyzed 120 postmenopausal women (r=0.576, P<0.001). Hasegawa et al. [ 69] found that BMD of the distal radius was more associated with HGS than with cross-sectional muscle area. Kaya et al. [ 70] found that hand BMD was significantly correlated with HGS in men but not in women aged 19 to 50 years, which might be masked by normal levels of estrogen in women.[ 71] Bertrand, A. M., Mercier, C., et al. (2007). "Reliability of maximal static strength measurements of the arms in subjects with hemiparesis." Clin Rehabil 21(3): 248-257. Find it on PubMed Test reliability refers to how a test is consistent and stable in measuring its intended measure. Reliability will depend upon how strict the test is conducted and the individual's level of motivation to perform the test. The following link provides various factors influencing the results and test reliability. Validity
The forearm muscles are easily fatigued, so the best scores are usually achieved in the first or second trial.
Ibrahim K, May CR, Patel HP, Baxter M, Sayer AA, Roberts HC. Implementation of grip strength measurement in medicine for older people wards as part of routine admission assessment: identifying facilitators and barriers using a theory-led intervention. BMC geriatrics. 2018; 18(1):79. doi: 10.1186/s12877-018-0768-5. all I know is that I have always had the grip of a 10yr old & the ergonomist had never seen this consistency of weakness in a "healthy" person Asian expert consensus on sarcopenia recommends using a spring-type dynamometer to measure handgrip strength. CAMRY dynamometer, belongs to spring type dynamometer, is the most often used device to measure handgrip strength in Chinese studies. To the best of our knowledge, this is the first report on the relationship between the Jamar and CAMRY dynamometers. First, the relative reliability between the two dynamometers expressed by ICC varied from 0.815 to 0.854. Similarly, Spearman correlations between Jamar and the CAMRY dynamometer were 0.810–0.855. SEM% and MDC% were calculated to validate the precision and absolute reliability. Generally, SEM variability lower than 10% is considered appropriate for clinical purposes [ 14]. Other scholars insist that SEM% < 15% and MDC% < 30% demonstrate acceptable reliability [ 15]. Fortunately, the SEM% varied from 6.54% to 8.60%, and the MDC% varied from 17.84% to 23.79% in our research, which indicated high absolute reliability for the CAMRY dynamometer. The CAMRY dynamometer underestimated systematic bias in the Bland–Altman plots by 0.5 kg in men and 0.6 kg in women. As expected, the CAMRY dynamometer had excellent reliability and accuracy compared with the gold standard device. In summary, enough evidence has been shown from this review to recommend the use of a CAMRY dynamometer for Asian populations in clinical practice. A) Hydraulic type dynamometer (Jamar). It consists of two handles and one handle is curved to fit the hand. It has five handle position (①, ②, ③, ④, ⑤) for different handle size. Among them, the second handle (②) is the standard position suggested by the the American Society of Hand Therapist and the most commonly used position. (B) Jamar displays grip force in pounds and kg up to 200 pounds or 90 kg. The needle records automatically the highest force exerted to provide an easy and exact reading. I don't see the figures the same way as you. The example grip strength results of the NHL are mostly in the 'strong' range here. E.g. The best score at the 2012 NHL scouting combine was 167 lbs (75.8 kg). The average score from the combine was 128 lbs (58 kg)
Mancilla SE, Ramos FS, Morales BP. Association between handgrip strength and functional performance in Chilean older people. Rev Med Chil. 2016;144(5):598–603. Sheesh, go easy, you're just setting yourself up for disappointment like that. I was a teenager once, too, but you gotta give it a rest. Hand grip strength is a useful measure of muscle strength, and it has been proposed as a single biomarker of health status in older adults (Bohannon 2019) due to the association to multiple health outcomes as cognitive function, functional status, morbidity, and mortality (Soysal et al. 2021). Handgrip strength has been studied in a preoperative setting in different types of surgery, and weak muscle strength has shown to be a predictor of postoperative adverse outcomes such as hospital stay (Marano et al. 2022), complications rate (Chen et al. 2020), discharge to healthcare facilities, and mortality (Fountotos et al. 2021).
Users of the Camry 200 lbs Hand dynamometer have reached a positive consensus. A majority of the users of the Grip Strength Hand Grip found it very easy to switch scales. Another user of the Measurement Meter Auto Hand Grip said that the unit being lightweight offered ease of movement. It seems weird that this would be measured in kg since kg is a measure of mass. It's one of the few places where lbs is a more appropriate unit than kg. Ahh, I see below someone noted this too. A kg force unit is the force that a 1 kg mass would exert downwards at the surface of the earth in a length/time system where the earth's acceleration is 1 instead of ~10. (IOW 10 m=1 new length unit or 1/sqrt(10) sec= 1 new time unit or some combo.) We hypothesize that the Camry digital dynamometer is a reliable tool to assess handgrip strength in geriatric patients prior to elective surgery, compared to the Jamar® dynamometer.
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The frequency of HGS testing and the interval between measurements remain controversial. Opinions about whether HGS tests should be measured twice or three times are always diverse and complicated; the same situation applies to average or maximal values. A systematic review in 2018 comprehensively analysed 34 epidemiologic studies and summarized that most studies carried out two or three trials; only one test was less reliable than three trials [ 19]. The ASHT recommends that the grip strength test be repeated at least three times each hand, and an average of three trials be selected for analysis [ 5, 20]. Fortunately, our study design fully complied with this principle. On the other hand, the HGS interval between measurements was inconsistent among current studies. Wu et al. [ 21] investigated older Taiwanese individuals in 2014 and reported that a 30-s interval was necessary; however, other literature recommended a 6-s break [ 22]. There was literature comparing constant measurement and 1-min rest and concluded that continuous measurement led to reduced power, but a 1-min interval counteracted fatigue effects [ 23]. In short, the ASHT believes that an interval of more than 15 s is reasonable for HGS testing procedures [ 20].
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