Validity and Reliability of the PUSH Wearable Device to Measure Movement Velocity During the Back Squat Exercise

Abstract

Balsalobre-Fernández, C, Kuzdub, M, Poveda-Ortiz, P, and Campo-Vecino, Jd. Validity and reliability of the PUSH wearable device to measure movement velocity during the back squat exercise. J Strength Cond Res 30(7): 1968-1974, 2016-The purpose of this study was to analyze the validity and reliability of a wearable device to measure movement velocity during the back squat exercise. To do this, 10 recreationally active healthy men (age = 23.4 ± 5.2 years; back squat 1 repetition maximum [1RM] = 83 ± 8.2 kg) performed 3 repetitions of the back squat exercise with 5 different loads ranging from 25 to 85% 1RM on a Smith Machine. Movement velocity for each of the total 150 repetitions was simultaneously recorded using the T-Force linear transducer (LT) and the PUSH wearable band. Results showed a high correlation between the LT and the wearable device mean (r = 0.85; standard error of estimate [SEE] = 0.08 m·s) and peak velocity (r = 0.91, SEE = 0.1 m·s). Moreover, there was a very high agreement between these 2 devices for the measurement of mean (intraclass correlation coefficient [ICC] = 0.907) and peak velocity (ICC = 0.944), although a systematic bias between devices was observed (PUSH peak velocity being -0.07 ± 0.1 m·s lower, p ≤ 0.05). When measuring the 3 repetitions with each load, both devices displayed almost equal reliability (Test-retest reliability: LT [r = 0.98], PUSH [r = 0.956]; ICC: LT [ICC = 0.989], PUSH [ICC = 0.981]; coefficient of variation [CV]: LT [CV = 4.2%], PUSH [CV = 5.0%]). Finally, individual load-velocity relationships measured with both the LT (R = 0.96) and the PUSH wearable device (R = 0.94) showed similar, very high coefficients of determination. In conclusion, these results support the use of an affordable wearable device to track velocity during back squat training. Wearable devices, such as the one in this study, could have valuable practical applications for strength and conditioning coaches.

Validity and reliability of a novel optoelectronic device to measure movement velocity, force and power during the back squat exercise

“…This also makes LT delicate because tripping over the device or bumping the cable can damage the mechanism. Accelerometers, on the other hand, are gaining popularity as they are more affordable than LT and the validity of several devices has been already studied (Balsalobre-Fernandez, Kuzdub, Poveda-Ortiz, & Campo-Vecino, 2016;Crewther et al, 2011). However, accelerometers also require to be fixed to the bar, which exposes the device to shocks and to potential damages.…”

Validity and Reliability of a Smartphone Accelerometer for Measuring Lift Velocity in Bench-Press Exercises

“…This may be explained because, in the MBP, sampling frequency was set at 50 Hz, a lower value than in other accelerometers used for velocity measurement (i.e., 200 to 500 Hz) [16,26]. In addition, the building quality of accelerometers (e.g., Push band, Beast) [16,26] and their prices (i.e., 250-350 USD) are higher compared with the smartphone accelerometers, which are not meant to analyze movement with such high precision and which have a lower price (i.e., less than 5 USD). Therefore, it is hard to expect that the Sustainability 2020, 12, 2312 8 of 9 ACC in the present study will have better measurement precision compared to other higher-quality accelerometers and linear transducers.…”

“…Thus, linear transducers are considered the gold-standard tool [25] for measuring lift velocities. Other systems, like accelerometers, have been shown to be valid and reliable tools for measuring lift velocities [16][17][18][19][20][21][22][23][24][25][26] and muscular power [22].…”

Intelligent Exercise Guidance System Based on Smart Clothing

“…Without effective guidance during exercise, appropriately controlling exercise intensity can be difficult for an individual without training experience. Wearable-device-based exercise guidance systems have thus been proposed in recent years to resolve this problem [11][12][13][14][15][16][17][18][19]. Astaras et al [11] and Kokonozi et al [12] presented prototypes of a wearable dry electrode device designed for exercise guidance and real-time monitoring of patients with CVD.…”

“…Astaras et al [11] and Kokonozi et al [12] presented prototypes of a wearable dry electrode device designed for exercise guidance and real-time monitoring of patients with CVD. Balsalobre-Fernandez et al [13] introduced a wearable band for measuring movement velocity during a back squat exercise. Pruthi et al [14] described an autonomous wearable device to count repetitive exercise movements in real time.…”