RELIABILITY AND RELATIONSHIPS AMONG MAXIMAL POWER OUTPUT DURING SIT-TO-STAND AND VERTICAL JUMP ASSESSMENTS USING A PORTABLE COMMERICALLY-DESIGNED TESTING DEVICE
Cameron S. Mackey, Ryan M. Thiele, Ty B. Palmer, Eric C. Conchola, & Doug B. Smith
Oklahoma State University, Stillwater, Oklahoma
Performing vertical jumps (VJs) to assess maximal power output (Pmax) may not be appropriate for all individuals, especially those who are older and more frail. Alternatively, the sit-to-stand (STS) test may be a more practical and functionally-relevant assessment tool for examining Pmax in these types of individuals. Consequently, it may be of great value to examine the reliability of Pmax using a portable commercially-designed testing device in conjunction with the STS, as well as explore the relationships between Pmax as measured during a STS and a VJ. PURPOSE: To determine the reliability and relationships among Pmax during VJ and STS assessments using a commercially-designed testing device. METHODS: Sixteen healthy, college-aged males (mean±SD:age=24±4yr; height=177±7cm; mass=86±19kg) participated in this investigation. Participants visited the laboratory 2 times, separated by 2-7 days at the same time of day (±2hr). For each visit, participants performed 3 STSs from an adjustable table at 90o (STS90) and 120o (STS120) of knee flexion and 3 countermovement VJs (CMJ) and squat jumps (SJ) in a randomized order. To determine Pmax, the testing device was attached to the posterior portion of a belt fastened around the participants’ waistline. Participants performed all STSs and VJs with feet shoulder width apart and hands positioned on the hips. For each STS and VJ, participants were asked to stand- or jump-up as explosively as possible. Reliability for Pmax during the STS90, STS120, CMJ, and SJ were determined using the intraclass correlation coefficient (ICC, model 2,1) and standard error measurement (SEM). Systematic variability was examined using separate one-way repeated measures analyses of variance (ANOVAs). Pearson correlation coefficients (r) were used to examine the relationships between Pmax as measured during the STSs and VJs. RESULTS: The ANOVAs indicated no systematic variability in Pmax across trials (P>0.05). The ICCs and SEM values expressed as a percentage of the mean ranged from 0.958-0.978 and 5.586-6.396% for the STSs and 0.924-0.974 and 4.025-6.534% for the VJs, respectively. In addition, significant positive relationships were observed between Pmax as measured during the STS90, STS120, CMJ, and SJ (r=0.751-0.962; P≤0.001). CONCLUSION: The results of the present study reveal that commercially-designed devices may be highly reliable for assessing Pmax during STSs and VJs. STS90 and STS120 exhibited a significant positive relationship with CMJ and SJ, which demonstrates that STS testing may be an effective alternative to vertical jumping for assessing lower-body muscle power.
Mackey, CS; Thiele, RM; Palmer, TB; Conchola, EC; and Smith, DB
"RELIABILITY AND RELATIONSHIPS AMONG MAXIMAL POWER OUTPUT DURING SIT-TO-STAND AND VERTICAL JUMP ASSESSMENTS USING A PORTABLE COMMERICALLY-DESIGNED TESTING DEVICE,"
International Journal of Exercise Science: Conference Proceedings: Vol. 11
, Article 33.
Available at: http://digitalcommons.wku.edu/ijesab/vol11/iss2/33
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